CN116459873B - A catalyst for carbonylation of olefinic unsaturated compounds and its preparation method and application - Google Patents
A catalyst for carbonylation of olefinic unsaturated compounds and its preparation method and application Download PDFInfo
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Abstract
The invention provides a carbonylation catalyst, a preparation method and application thereof, wherein the catalyst takes VIB or VIIIB metal as an active site, takes a large-steric-hindrance bidentate ligand as a metal complex, can show high reaction rate and product selectivity when being used for the carbonylation reaction of an olefinically unsaturated compound under the action of an organic sodium salt and a stearate auxiliary agent, and meanwhile, active components have better stability in the reaction process, so that the catalyst can show excellent long-period stability.
Description
Technical Field
The invention relates to the field of carbonylation of olefinically unsaturated compounds, in particular to a catalyst for carbonylation of olefinically unsaturated compounds, a preparation method and application thereof.
Background
At present, carbonylation reaction researches are mature, mainly, under the action of a transition metal catalyst, synthesis gas is used as a carbonyl source to realize the hydroformylation of unsaturated hydrocarbon and fatty acid, and meanwhile, a plurality of domestic and foreign patent researches report that in an alcohol or water system, only CO is used as a carbonyl source to enable an olefinically unsaturated compound to be carbonylated to obtain corresponding ester or carboxylic acid, carbonylation and esterification processes are realized in one step, a catalyst system mainly uses VI, VIII, IX or an X group element as an active site, and monodentate or bidentate phosphine is used as a ligand, such as alkyl, aryl, cycloalkyl or pyridylphosphine, and the catalytic carbonylation reaction process is realized after coordination complexing.
WO96/19434 discloses a bidentate phosphine ligand structure in which aryl groups are used as bridging groups and adjacent carbon atoms of the aryl groups are connected with phosphorus, so that the carbonylation reaction rate of an olefinically unsaturated compound is obviously improved, federico et al find that the dissociation between an alkoxy group of an ester-forming precursor alcohol and proton hydrogen is the rate limiting step of the reaction when the dynamics of the system is studied, but do not mention an effective solution for improving the alcoholysis rate. In addition, for the reaction of carbonylation of olefinically unsaturated compounds to esters, the bidentate phosphine ligand catalyst system disclosed in EP-A-0227160 and the like can effectively improve the catalyst activity, but has the problem of poor stability caused by reduction, precipitation and inactivation of active sites in the reaction process, and has the problem of higher cost in industrialization.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an olefinically unsaturated compound carbonylation catalyst and a method for preparing the same, by which the carbonylation reaction rate can be further increased, and the loss of active metal sites during the carbonylation of the olefinically unsaturated compound can be effectively suppressed, thereby remarkably improving the stability thereof and reducing the catalyst cost.
It is another object of the present invention to provide a method for preparing a carboxylic acid ester thereof by catalyzing an olefinically unsaturated compound with the catalyst, which is applied to the carbonylation of the olefinically unsaturated compound, has substantially no other by-products, has high selectivity and has excellent catalytic activity.
In order to achieve the above purpose, the present invention adopts the following scheme.
An olefinically unsaturated compound carbonylation catalyst comprising a main catalyst and an adjunct, the main catalyst comprising the following components:
① A group VIB or group VIIIB metal active component;
② A ligand;
③ An acid;
Wherein the group VIB or group VIIIB metal comprises one or more of metal Cr, mo, W, fe, co, ni, ru, rh, os, ir, pt and Pd, preferably selected from Ni, pt and Pd, and the ligand is bidentate phosphine, arsine or antimony ligand.
The ligand is preferably a bidentate phosphine ligand of the following general formula (1),
Wherein X is a substituted bridging group and X is selected from the group consisting of a substitutable aryl, cyclopentadienyl, indenyl, or cycloalkyl group, preferably cyclopentadienyl. R 1、R2、R3 and R 4 are substituents attached to a phosphorus atom, R 1、R2、R3 and R 4 are the same or different, and R 1、R2、R3 and R 4 are each selected from substituents having a large steric hindrance as t-butyl groups, including but not limited to t-butyl groups, adamantyl groups, and substituents thereof.
The molar ratio of the ligand to the active component of the metal in the VIB group or the VIIIB group is 1:1-100:1, preferably 1:1-50:1, so as to ensure the saturated coordination of the active site of the metal and enhance the binding force of the ligand and the active site of the metal.
The acid is a compound derived from weak coordination anions, low carbon chain alkanoic acid, sulfonic acid, phosphonic acid, and the like, and sulfonic acid and phosphonic acid are preferred. The molar ratio of the acid to the active component of the metal of group VIB or group VIIIB is from 2:1 to 500:1, preferably from 20:1 to 400:1.
Components ① to ③ can be added to an organic solvent in situ to react to form a main catalyst required by carbonylation reaction, or can be synthesized in any order to form a catalyst system, or can be synthesized in a specific order, three components can be combined in any form to form intermediate components and then react with a third component to form a final main catalyst, for example, components ② and ③ are firstly mixed to form a protonated ligand and then are complexed with ① to form the catalyst system, or ① and ② are firstly complexed to form a chelated metal compound and then are added with acid to carry out protonation to form the catalyst system.
The auxiliary agent comprises an auxiliary agent M and/or an auxiliary agent N, wherein the auxiliary agent M is sodium salt, preferably organic sodium salt, more preferably one or more of sodium salicylate, sodium p-aminobenzoate, sodium o-hydroxybenzoate, sodium M-hydroxybenzoate or sodium p-hydroxybenzoate.
Preferably, the auxiliary agent N is stearate, including but not limited to one or more of barium stearate, zinc stearate, calcium stearate, cadmium stearate, magnesium stearate or copper stearate.
The order of addition of the auxiliaries M and N to the components ① to ③ may be arbitrary, preference being given to adding the reaction system after the components ① to ③ have reacted to give the catalyst system.
Preferably, the auxiliary agent comprises an auxiliary agent M and an auxiliary agent N which are used simultaneously, wherein the mass ratio of the auxiliary agent M to the auxiliary agent N is 1:10-10:1, preferably 2:1-1:2. The catalyst system prepared by the method can show excellent catalytic activity and stability in catalyzing the carbonylation reaction of the olefinically unsaturated compound, can reduce the generation of isomerism products and multi-carbonyl products under the effect of a space restriction effect after a ligand modifies a large steric hindrance group, and realizes high selectivity of single-carbonyl linear products, thereby simplifying the subsequent product separation process.
On the other hand, the introduction of the auxiliary agent can effectively improve the gas-liquid mass transfer rate in the reaction process of the olefinically unsaturated compound and the carbonylation reagent, and unexpectedly, the auxiliary agent can further improve the rate of dissociating the alcoholic hydroxyl group into protons and alkoxy groups in the esterification process of the acyl palladium, and effectively improve the carbonylation reaction rate of the olefinically unsaturated compound under the conditions of high mass transfer rate and high alcoholic hydroxyl group dissociation rate.
The invention also provides application of the catalyst, and specifically relates to a method for carbonylating an olefinically unsaturated compound in the presence of a hydroxyl-containing compound by using carbon monoxide as a carbonylation reagent under the condition of the catalyst.
The olefinically unsaturated compound is a linear or branched olefin or alkyne containing one or more unsaturated bonds, preferably 1 to 3 unsaturated bonds, which may be unsubstituted or substituted with alkyl, aryl, heteroatom-containing groups and the like, preferably a C1 to C4 linear olefin or alkyne, more preferably ethylene.
The hydroxyl-containing compound is an organic molecule comprising water or a hydroxyl-containing group, which may be linear or branched, and may be substituted by one or more substituents of lower alkyl, halogen, nitro or cyano, preferably an alkanol, particularly preferably methanol or ethanol. The amount of the hydroxyl-containing compound to be added is not critical and can be reasonably adjusted according to the actual reactivity, and preferably, the molar ratio of the hydroxyl-containing compound to the ethylenically unsaturated compound is 10:1 to 1:10, more preferably 2:1 to 1:2.
The carbon monoxide is generally in a pure state, can also contain inert gases such as nitrogen, argon and the like which do not influence the activity of the catalyst, can also simultaneously contain a small amount of hydrogen with the volume of less than 5 percent, and has no strict requirement on the dosage of the carbon monoxide, and the molar ratio of the carbon monoxide to the olefinically unsaturated compound is preferably 1:100-1:1.
The catalyst may be added in an amount according to common general knowledge in the art, preferably the molar concentration of the active component of the group VIB or group VIIIB metal in the catalyst in the reaction system is 1-200 x 10 -5 mol/Kg, more preferably 2-100 x 10 -5 mol/Kg. I.e. the molar number of active components of the metal of group VIB or group VIIIB contained in each kilogram of solution (comprising inert solvent and hydroxyl compound) is 1-200 x 10 -5 mol, the mass content of the auxiliary M in the reaction system (comprising inert solvent and hydroxyl compound) is 0.01-2.0 wt%, preferably 0.1-1.0 wt%, and the mass content of the auxiliary N in the reaction system (comprising inert solvent and hydroxyl compound) is 0.01-5 wt%, preferably 0.1-2.0 wt%.
In addition to the starting hydroxyl-containing compounds in the reaction solution, the reaction according to the invention may be carried out in one or more inert solvents, suitable solvents include ketones, ethers, esters, amides and aromatic compounds and derivatives thereof, preferably aprotic solvents having a dielectric constant in the range 3-8 at 298.15K and 1 x 10 5Nm-2, more preferably anisole. The amount of the inert solvent is not critical, and the mass ratio of the inert solvent to the hydroxyl-containing compound is preferably 100:1 to 1:100, more preferably 20:1 to 1:20.
The carbonylation reaction is carried out at 50-150 ℃, preferably at 70-100 ℃, and at 0-5MPa, preferably at 0.5-3.5MPa.
The catalyst prepared according to the invention is applied to the carbonylation reaction of the olefinically unsaturated compound, on one hand, the carbonylation reaction rate of the olefinically unsaturated compound can be effectively improved, and on the other hand, the stability of active metal in the reaction process can be effectively improved by improving the interaction between the ligand and the active metal, so that the catalyst is more stable in the long-period operation process.
Detailed description of the preferred embodiments
The following examples further illustrate preferred embodiments within the scope of the present invention, which are intended to be illustrative only and not limiting in any way, and are therefore intended to further describe and illustrate the embodiments within the scope of the present invention.
The invention quantitatively analyzes the metal content in the reaction liquid by an inductively coupled plasma emission spectrometer (ICP-OES).
The invention analyzes the composition of the reaction liquid through gas chromatography GC-2014, calculates the conversion number TON through a formula (1) to compare the stability of the catalyst, calculates TOF through a formula (2) to compare the reaction rate of the catalyst, and calculates the reaction selectivity through a formula (3):
(1) Ton=mol of methyl propionate accumulated during the reaction/mol of total addition of metal;
(2) TOF = mole of methyl propionate produced per unit time/mole of metal required for the reaction;
(3) Selectivity = mol of reactant consumed to form the desired product/mol of reactant involved in the reaction
The raw materials comprise 1,1' -bis (di-tert-butylphosphino) ferrocene which is purchased from Aladin, the purity of the reagent is 98 percent, and triphenylphosphine which is purchased from Aladin, and the purity of the reagent is 99 percent.
Example 1
0.1827G of nickel nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 29.4g of phosphonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reaction vessel.
10G of sodium salicylate and 10g of zinc stearate are added into 1000g of methanol under the anaerobic condition, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 82541molMeP/molPd/h, the accumulated TON is 253wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 2
0.1827G of nickel nitrate, 0.474g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 1.96g of phosphonic acid were added to 312.5g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 2L reactor.
Under the anaerobic condition, 1.25g of sodium p-aminobenzoate and 2.5g of barium stearate are added into 937.5g of methanol and stirred for 1h at normal temperature, and transferred into the catalyst solution, and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 100 ℃ after replacement, the mixed gas is stamped to 1MPa for reaction, the mixed gas is continuously supplemented to ensure that the reaction is carried out under the condition of 1MPa in the kettle, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 76416molMeP/molPd/h, the accumulated TON is 248wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 3
0.1827G of nickel nitrate, 23.721g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 39.2g of phosphonic acid were added to 3000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reaction vessel.
Under the anaerobic condition, 40g of sodium o-hydroxybenzoate and 20g of magnesium stearate are added into 1000g of methanol, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 70 ℃ after replacement, the mixed gas is stamped to 3MPa for reaction, along with the reaction, the mixed gas is continuously supplemented to ensure the 3MPa in the kettle for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 80128molMeP/molPd/h, the accumulated TON is 240wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 4
0.3191G of platinum nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 60.0g of trifluoromethanesulfonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1 hour and transferred to a nitrogen-substituted 5L reaction vessel.
10G of sodium metahydroxybenzoate and 40g of calcium stearate were added to 1000g of methanol under anaerobic conditions and stirred at normal temperature for 1 hour, and transferred to the above catalyst solution, and mixed uniformly.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 78238molMeP/molPd/h, the accumulated TON is 235wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 5
0.2304G of palladium nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 60.0g of trifluoromethanesulfonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1 hour and transferred to a nitrogen-substituted 5L reaction vessel.
Under the anaerobic condition, 10g of sodium p-hydroxybenzoate and 10g of cadmium stearate are added into 1000g of methanol, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 76002molMeP/molPd/h, the accumulated TON is 234wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 6
0.1827G of nickel nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 29.4g of phosphonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reaction vessel.
10G of sodium salicylate is added into 1000g of methanol under the anaerobic condition, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 70541molMeP/molPd/h, the accumulated TON is 228wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Example 7
0.1827G of nickel nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 29.4g of phosphonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reaction vessel.
Under the anaerobic condition, 10g of zinc stearate is added into 1000g of methanol and stirred for 1h at normal temperature, and then is transferred into the catalyst solution to be uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 68941molMeP/molPd/h, the accumulated TON is 210wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Comparative example 1
0.1827G of nickel nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 29.4g of phosphonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reaction vessel.
10G of sodium carbonate is added into 1000g of methanol under the anaerobic condition, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 52800molMeP/molPd/h, the accumulated TON is 196wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Comparative example 2
0.1827G of nickel nitrate, 5.246g of triphenylphosphine and 29.4g of phosphonic acid were added to 1000g of anisole solution under anaerobic conditions, stirred at room temperature for 1h and transferred to a nitrogen-substituted 5L reactor.
10G of sodium salicylate is added into 1000g of methanol under the anaerobic condition, stirred for 1h at normal temperature, transferred into the catalyst solution and uniformly mixed.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 56250molMeP/molPd/h, the accumulated TON is 201wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
Comparative example 3
0.1827G of nickel nitrate, 9.488g of 1,1' -bis (di-tert-butylphosphino) ferrocene and 29.4g of phosphonic acid were added to a mixed solution of 1000g of anisole and 1000g of methanol under anaerobic conditions, stirred at room temperature for 1 hour and then transferred to a nitrogen-substituted 5L reaction vessel.
The mixed gas of ethylene and carbon monoxide with the ratio of 1:1 is used for replacing a reaction kettle, the temperature is raised to 90 ℃ after replacement, the mixed gas is stamped to 2MPa for reaction, the mixed gas is continuously supplemented along with the reaction, the 2MPa in the kettle is guaranteed for reaction, sampling analysis and TOF calculation are carried out after the reaction is carried out for 1h, the reaction is stopped after the reaction is carried out for 8h, the product composition is analyzed through gas chromatography, the accumulated TON and the catalyst selectivity in 8h are obtained through calculation, and the accumulated TON in the whole process is calculated to be used as the catalyst activity evaluation basis through the application until the catalyst is deactivated.
Calculated, the TOF of the catalyst is 44127molMeP/molPd/h, the accumulated TON is 180wmolMeP/molPd, and the selectivity of methyl propionate is as high as 99.9%.
By comparing the activity and stability of the olefinically unsaturated compounds prepared in the above examples and comparative examples, it is possible to obtain catalysts prepared by the present patent which can exhibit high reaction rates and product selectivities. Furthermore, unexpectedly, the active metals are more stable during the above reaction, exhibiting excellent long-cycle stability.
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