CN116786151B - Bimetallic nitride catalyst and preparation method and application thereof - Google Patents
Bimetallic nitride catalyst and preparation method and application thereofInfo
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Abstract
本发明公开了一种双金属氮化物催化剂及其制备方法和应用，所述催化剂以Ni、Co、N为催化剂成分，由表面被直径约3‑5μm的纳米花密集覆盖，纳米花相互堆叠，横向尺寸为数百纳米，厚度为2‑10nm。其制备方法为一步水热和管式炉煅烧得到NiCoN，公开了一种基于NiCoN的MgH2基储氢材料的制备方法：在氩气条件下，将NiCoN与MgH2混合后进行正反转球磨。所得基于NiCoN的MgH2基储氢材料作为储氢材料的应用，NiCoN的摻杂量为6wt％，初始脱氢温度为160‑175℃；在285℃下脱氢量为4.5‑5.0wt％；在75℃条件下的吸氢量为2.5‑2.9wt％；10次循环后的保持率为96‑98％；脱氢反应的活化能降低到56.5kJ/mol。
The present invention discloses a bimetallic nitride catalyst and its preparation method and application. The catalyst uses Ni, Co, and N as catalyst components, and its surface is densely covered with nanoflowers with a diameter of about 3-5 μm. The nanoflowers are stacked on each other, with a lateral size of hundreds of nanometers and a thickness of 2-10 nm. Its preparation method is to obtain NiCoN by one-step hydrothermal and tubular furnace calcination. A preparation method of a MgH2- based hydrogen storage material based on NiCoN is disclosed: under argon conditions, NiCoN is mixed with MgH2 and then subjected to forward and reverse ball milling. The obtained NiCoN-based MgH2- based hydrogen storage material is used as a hydrogen storage material. The NiCoN doping amount is 6wt%, the initial dehydrogenation temperature is 160-175°C; the dehydrogenation amount is 4.5-5.0wt% at 285°C; the hydrogen absorption amount is 2.5-2.9wt% at 75°C; the retention rate after 10 cycles is 96-98%; and the activation energy of the dehydrogenation reaction is reduced to 56.5kJ/mol.
Description
Technical Field
The invention relates to the technical field of hydrogen storage materials of new energy materials, in particular to a bimetallic nitride catalyst and a preparation method and application thereof.
Background
At present, due to limited fossil fuel resources and serious environmental pollution, the development of clean energy is imperative. Hydrogen energy is considered as the most promising alternative energy source because of its abundant yield, environmental friendliness and high calorific value. However, among many hydrogen storage materials, magnesium-based materials have significant advantages in terms of hydrogen storage capacity, cost, raw material reserves, and the like. In order to meet the needs of practical applications, magnesium-based hydrogen storage materials are required to reduce thermodynamic stability and improve absorption and desorption kinetics of hydrogen. At present, researchers generally adopt methods such as catalysis, alloying, nanotechnology, surface modification and the like to improve the performance of the magnesium-based hydrogen storage material. These processes can increase the hydrogenation/dehydrogenation reaction rate and reduce the apparent activation energy for hydrogen absorption and desorption.
Magnesium hydride (MgH 2) has high hydrogen storage capacity (7.6 wt%) and good reversibility, is considered as one of the most potential solid hydrogen storage materials, but has high thermal stability and slow dynamics speed, and severely restricts the use of the magnesium hydride as a vehicle-mounted energy storage carrier.
In recent years, researchers have improved the hydrogen storage performance of MgH 2 by doping modification, nanocrystallization, composite system construction, confinement and the like, namely, lowering the hydrogen absorption and desorption temperature, improving the kinetics and reversibility of hydrogen absorption and desorption, and it has been reported that transition metals such as TiO 2, niC1, ni 3 N and the like as catalysts can effectively improve the hydrogen storage performance of MgH 2, but they do not greatly improve the hydrogen storage performance of MgH 2, and many of these have been currently studied modified carbon materials, transition metals and oxides, nitrides and alloy compounds thereof, which are catalytically active additives, in which the transition metals can effectively weaken mg—h bonds because hydrogen atoms tend to form covalent bonds with the transition metals, and covalent bonds of 3d transition metal elements with H atoms are relatively weak. Therefore, transition metals are considered to be the main catalytically active species and are widely used to improve the hydrogen absorption and desorption properties of MgH 2 hydrogen storage systems.
At present, transition metal nitride can be used as a catalyst to effectively improve the hydrogen storage performance of the composite material, but a lot of single metal nitride is used as the catalyst, niCoN is used as the catalyst to have good hydrogen storage performance, and the unique phase composition and structure of the nano flower-shaped NiCoN can greatly enhance the ball milling effect, thereby being beneficial to uniform distribution of NiCoN on a MgH 2 matrix. Mg 2Co/Mg2CoH5 and Mg 2Ni/Mg2NiH4 formed in situ can greatly promote hydrogen dissociation and lower the initial hydrogen desorption temperature, so NiCoN can further improve the hydrogen storage performance of the composite material as a catalyst.
In the prior art, zhang et al International Journal of Hydrogen Energy,2017, DOI: 10.1016/j.ijhydene.2017.07.220) has proved that the Fe nano catalyst has excellent double-function catalytic activity on MgH 2 hydrogen storage, so that MgH 2 modified by the Fe nano catalyst can achieve the aim of starting hydrogen release at 182.3 ℃.
Similar Zhang et al (Journal ofEnergy Chemistry,2020, DOI: 2020.04.104) introduced the MgH 2 system with ball milling of nickel-based compounds (Ni 3C-MgH2、Ni3N-MgH2、NiO-MgH2 and MgH 2-Ni2 P) to reduce the desorption onset temperatures to 160 ℃, 180 ℃, 205 ℃ and 248 ℃, respectively.
In summary, each nickel-based compound contributes to the performance of MgH 2.
On this basis, liu et al (International Journal of Hydrogen Energy,2020, DOI: https:// doi.org/10.1016/j.ijhydene.2020.04.104) prepared NiFe-LDH composite material by hydrothermal method, then reduced in hydrogen atmosphere to prepare layered Ni 3 Fe catalyst composite material, and the synergistic effect between the two was utilized to improve the comprehensive performance of MgH 2. Although the technical proposal reduces the initial temperature of MgH 2 to 205 ℃ through the synergistic effect of Ni and Fe, and uniformly anchors Ni 3 Fe at rGO through hydrothermal to reduce the initial temperature to 185 ℃, the performance of the composite material can not reach the theoretical upper limit of the composite material.
Therefore, the structure of the material is controlled by a reasonable preparation method, so that the flower-like material with thinner sheets is obtained, and the method is an effective way for improving the material performance.
The above work reports that the hydrogen storage performance of MgH 2 is improved by doping MgH 2 with nickel-based compound and transition metal Ni and Fe respectively or by synergistic catalysis, but the hydrogen storage performance of MgH 2 and the hydrogen storage material still does not meet the actual requirements and needs to be further improved. Therefore, the problems to be solved are:
1. the catalyst has no better catalytic performance:
2. the elements contained in the catalyst do not have the property of enhancing the absorption and dissociation of hydrogen;
3. The catalyst has catalytic performance, but has no special morphology, and the special morphology of the catalyst has the effect on the hydrogen storage performance of MgH 2;
disclosure of Invention
The invention aims to provide a bimetallic nitride catalyst, and a preparation method and application thereof.
According to the work of the applicant and the research analysis of the technical scheme, the conclusion can be drawn that the current research on the preparation method of the Ni 3 N composite material still cannot realize the great improvement of the MgH 2 performance.
Therefore, the invention aims at the technical problems existing in the prior art, adopts other preparation conditions to realize the following aims:
1. NiCoN bimetallic nanoflowers are obtained through hydrothermal and calcining technology. Then, the prepared NiCoN is doped into MgH 2 by grinding, so that the hydrogen absorption and desorption performance of MgH 2 can be effectively improved;
2. Preparing a catalytic MgH 2 composite material, and grinding MgH 2 and 6wt% of a catalyst together by a planetary ball mill under Ar atmosphere;
in order to achieve the aim of the invention, the invention adopts the following technical scheme:
The bimetallic nitride NiCoN is used as a catalyst, and is characterized in that the preparation process is simple, ni, co and N are used as main components of the catalyst, and NiCoN bimetallic nanoflower is obtained through a simple one-step hydrothermal and calcining technology.
Wherein, niCoN is a catalyst in a nano flower shape synthesized by calcining in a hydrothermal and tubular furnace, and the microcosmic appearance is in a sheet flower shape, thus greatly enhancing the ball milling effect and being beneficial to the uniform distribution of NiCoN on a MgH 2 matrix;
the base material of the catalyst is nickel nitrate hexahydrate, cobalt sulfate heptahydrate, urea and ammonium fluoride.
The preparation method of the bimetallic nitride NiCoN catalyst comprises the following steps:
Step 1) NiCoN, adding Ni (NO 3)2·6H2O、CoSO4·7H2 O) with a certain amount of substances into deionized water, uniformly stirring, and then sequentially dripping NHF 4 and urea into the mixture for continuous stirring. After complete dissolution, the solution was transferred to an autoclave for a period of time. After natural cooling to room temperature, the hydrothermal sample sediment was collected, washed several times with deionized water, and the sediment after centrifugation was collected and then dried overnight by vacuum. Transferring the dried powder into a tube furnace, and calcining for a period of time under flowing argon gas flow to obtain NiCoN;
In the step 1, Ni(NO3)2·6H2O(1mmol)、CoSO4·7H2O(1mmol)、H2O(30mL)、NHF4(5mmol)、 urea (10 mmol) is stirred for 30min, the medicine dripping sequence condition of the step 1 is that the medicines are slowly dripped in sequence, the hydrothermal reaction condition of the step 1 is that the temperature is kept at 100 ℃ for 8h, the washing and drying condition of the step 1 is that deionized water is washed and centrifuged for 6 times, the centrifugal speed is 9000r/min, the centrifugal time is 5min, the drying is at 65 ℃ for 10h, and the calcining condition of the step 1 is that the calcining is carried out at 500 ℃ for 2h.
Step 2) preparation of a hydrogen storage material doped with magnesium hydride by using a NiCoN catalyst, mixing NiCoN obtained in the step 1 with magnesium hydride according to a certain mass ratio, and performing ball milling under a certain condition to obtain the NiCoN hydrogen storage material doped with magnesium hydride.
The mass fraction of NiCoN is 2-8wt%, the ball milling condition is that argon is used as protective atmosphere, the ball-material ratio is 40:1, the ball milling rotating speed is 400-450r/min, and the ball milling time is 10h.
The beneficial technical effects of the bimetallic nitride NiCoN serving as the catalyst are detected as follows:
the bimetallic nitride NiCoN can be seen to be in the shape of a plate nano flower by the test of a scanning electron microscope.
Thermal Gravimetric (TG) detection of bimetallic nitride NiCoN catalyst revealed that when the doping amount of the catalyst was 6wt%, the initial desorption temperature of the system was reduced to 164-185℃and the hydrogen desorption amount was 6.1-6.9wt%.
As can be seen from the detection of the pressure-component-temperature (PCT) of the bimetallic nitride NiCoN catalyst, the system can completely release hydrogen at 330 ℃ during isothermal hydrogen release, the hydrogen release amount reaches 6.2-6.6wt% within 15min, and the system can still absorb 5.2-5.8wt% within 50min even under the condition of low temperature of 150 ℃.
Therefore, the bimetallic nitride NiCoN catalyst of the present invention has the following advantages over the prior art:
1) Mg 2Co/Mg2 Ni and Mg 2CoH5/Mg2NiH4, formed in situ, act as induced phases, since they are of lower hydrogenation and dehydrogenation temperatures, and can absorb and desorb hydrogen before the Mg/MgH 2 system, and thus they can be considered as "hydrogen pumps" in the composite.
2) The NiCoN catalyst synthesized by the process of the present invention had an initial hydrogen desorption temperature of 164 ℃ after ball milling with MgH 2, which is higher than the values reported in the above documents.
Compared with the prior art, the invention has better hydrogen storage performance and material stability, and has wide application prospect in the hydrogen storage field.
Drawings
FIG. 1 is an XRD pattern of NiCoN catalyst material prepared in example 1;
FIG. 2 is a scanning electron microscope image of NiCoN catalyst materials prepared in example 1;
FIG. 3 is a graph showing TG curves of NiCoN-MgH 2 composites prepared in example 1 at different doping levels.
FIG. 4 is a graph showing isothermal hydrogen desorption performance at different temperatures of NiCoN-MgH 2 composite material prepared in example 1;
FIG. 5 is a graph showing isothermal hydrogen absorption performance at different temperatures for NiCoN-MgH 2 composites prepared in example 1;
FIG. 6 is a graph showing isothermal hydrogen desorption performance at different temperatures of ball-milled MgH 2 without catalyst prepared in example 1;
FIG. 7 is a graph showing isothermal hydrogen desorption performance at various temperatures of ball-milled MgH 2 without catalyst prepared in example 1;
FIG. 8 is a DSC curve and Kissinger curve of the NiCoN-MgH 2 composite prepared in example 1 at different ramp rates;
FIG. 9 is a DSC curve and a Kissinger curve of different ramp rates of ball-milled MgH 2 without catalyst incorporation prepared in example 1;
FIG. 10 is an XRD pattern for NiCoN-MgH 2 composite prepared in example 1, ball milled and hydrogen absorbed/desorbed;
FIG. 11 is a bar graph of the hydrogen desorption cycle life of NiCoN-MgH 2 composite prepared in example 1;
Detailed Description
The present invention will now be described in further detail by way of examples, and not by way of limitation, with reference to the accompanying drawings.
Example 1
The embodiment provides a preparation method of a catalyst of a bimetallic nitride NiCoN, which comprises the following steps:
Step 1, preparation of NiCoN precursor, firstly, dissolving Ni (NO 3)2·6H2 O (1 mmol) and CoSO 47H2 O (1 mmol) in 30mL of deionized water, magnetically stirring, then sequentially adding NHF 4 (5 mmol) and 10mmol of urea into the solution, continuing stirring, transferring the solution into a 100mL autoclave for heat preservation after complete dissolution, naturally cooling to room temperature, and collecting a hydrothermal sample deposit;
Step 2) washing with deionized water several times, collecting the precipitate after centrifugation, and then drying overnight in a vacuum oven. The urea and dried powder are then transferred to a tube furnace and calcined under a flowing gas stream. After natural cooling to room temperature, the samples were collected and transferred into a glove box filled with Ar for further use.
The conditions of the hydrothermal reaction and the calcination in the tube furnace are not particularly specified, and the hydrothermal reaction and the calcination in the tube furnace are carried out for 8 hours at the hydrothermal temperature of 100 ℃ and for 2 hours at the temperature of 500 ℃;
the conditions of stirring, centrifuging and washing are not particularly specified, namely stirring is carried out for 30min, the centrifugal rotating speed is 9000r/min, the centrifugal time is 5min, and the centrifugal washing is carried out under the condition that the centrifugal times are 6 times;
the drying conditions of the present invention are, unless otherwise specified, drying at a drying temperature of 60 ℃ and a drying time of 10 hours;
To demonstrate the successful preparation NiCoN of step 1, XRD testing was performed. The test results are shown in fig. 1, and the diffraction peak of NiCoN is matched with the standard peak crystal face of NiCoN well. Test results show that NiCoN is successfully synthesized, and the purity and the crystallinity are high.
SEM testing was performed to demonstrate the microstructure of the NiCoN precursor from step 1. The test results are shown in fig. 2, and the microstructure of NiCoN is obtained to be in the shape of a sheet-like nanoflower through SEM test.
A preparation method of MgH 2 -based hydrogen storage material based on NiCoN, namely application of nano flower-shaped NiCoN as MgH 2 hydrogen storage material catalyst, comprises the steps of mixing NiCoN with MgH 2 at NiCoN addition amount of 6wt% under argon condition, performing high-energy ball milling at ball material ratio of 40:1 and ball milling rotation speed of 400rpm and total ball milling time of 10h, wherein the high-energy ball milling mode is a counter-rotating ball milling mode, single ball milling time is 12min, and ball milling interval is 6min, thus obtaining MgH 2 -based hydrogen storage material with NiCoN addition amount of 6wt%, named MgH 2 -6NiCoN.
To demonstrate the hydrogen storage properties of MgH 2 -6NiCoN composites, TG and PCT tests were performed.
In order to prove the initial hydrogen release temperature and the hydrogen release amount of the MgH 2 -6NiCoN composite material, TG tests are carried out on the hydrogen storage material, the test result is shown in figure 3, the initial hydrogen release temperature of the hydrogen storage material doped with the catalyst is 164 ℃, the hydrogen release amount is 6.12wt%, and the hydrogen release amount of the material shows a decreasing rule along with the increase of the doping amount.
In order to prove the hydrogen absorption and desorption capacities of the MgH 2 -6NiCoN composite material at different temperatures, PCT tests are carried out on the hydrogen storage material, and as shown in fig. 4-7, the MgH 2 -6NiCoN has excellent low-temperature hydrogen storage performance, can absorb a certain amount of hydrogen in a short time, can rapidly absorb 5.52wt% of hydrogen in 30 minutes at 150 ℃, and can release 4.98wt% of hydrogen in 30 minutes at a lower dehydrogenation temperature of 285 ℃ to achieve complete hydrogen desorption within 30 minutes basically.
In order to demonstrate the catalytic mechanism of MgH 2 -6NiCoN composite material, XRD test is carried out on the hydrogen storage material after ball milling and hydrogen absorption and desorption, as shown in figure 10, it can be seen from the figure that MgH 2 -6NiCoN still exists after ball milling NiCoN, and when hydrogen is released for the first time, niCoN is decomposed to generate Mg, mg2Ni and Mg2Co, and MgH2, mg2Ni4 and Mg2CoH5 are generated after hydrogen absorption again.
In order to prove the stability of the MgH 2 -6NiCoN composite material catalytic active substance, the hydrogen storage material is tested for cycle performance, and the specific test method is that PCT is used for testing the cycle performance at 310 ℃, the hydrogen pressure of hydrogenation is 2Mpa, the test analysis result is shown in figure 11, the actual hydrogen capacity of MgH 2 -6NiCoN is kept at 5.85wt% after 10 cycles, and compared with the first cycle capacity, the capacity retention rate is equivalent to 96.3%, which indicates that MgH 2 -6NiCoN shows stable dehydrogenation phenomenon and has good cycle stability.
As proved by the TG test and PCT test results, niCoN can be used as a catalyst to obviously reduce the initial hydrogen desorption temperature of MgH 2 and effectively catalyze the hydrogen desorption reaction of MgH 2 so as to improve the hydrogen desorption capacity.
To investigate NiCoN as a catalyst effect on the activation energy of MgH 2 and further reveal the catalytic mechanism of NiCoN, XRD patterns of dehydrogenated and rehydrogenated MgH 2 -6NiCoN were measured. In a glove box filled with argon, niCoN powder with a mass fraction of 6wt% was weighed and mixed with MgH 2. Then placing the powder into a stainless steel ball grinding tank, and weighing the stainless steel grinding balls according to the ball-to-material ratio of 40:1, and leaving the stainless steel grinding balls in the ball grinding tank. And (3) taking out the powder and the stainless steel ball in the glove box in a sealing way, ball milling for 10 hours in a positive and negative rotation way in a ball mill with the rotation speed of 400rpm, stopping for 6 minutes every 12 minutes to obtain the hydrogen storage material, putting the stainless steel ball milling tank in the glove box after ball milling, taking out the ball milled powder, and performing relevant tests.
In order to demonstrate the influence of NiCoN on the hydrogen storage performance of MgH 2, comparative examples 1 and 2 are provided, wherein in comparative example 1, mgH 2 -6NiCoN and MgH 2 are respectively used as hydrogen storage materials for hydrogen absorption and desorption at different temperatures, in comparative example 2, mgH 2 -6NiCoN and MgH 2 are respectively used as hydrogen storage materials for comparison of activation energy, and in order to demonstrate the catalysis mechanism of NiCoN, comparative example 2 is provided, and the catalysis mechanism of NiCoN is disclosed aiming at the comparison of peak positions in the XRD patterns of the hydrogen absorption and desorption of the composite materials.
Comparative example 1
A preparation method of MgH 2 -6NiCoN composite material, the procedure not specifically described is the same as in example 1, and PCT test is carried out on composite material MgH 2 -6NiCoN and ball milling MgH 2.
PCT test results of MgH 2 -6NiCoN and ball-milling MgH 2 are shown in figures 4-7, wherein the MgH 2 -6NiCoN composite material releases 4.96wt% of hydrogen at 285 ℃ for 30min, releases 5.52wt% of hydrogen at 150 ℃ for 30min, and releases 0.93wt% of hydrogen at 300 ℃ and releases 1.56wt% of hydrogen at 250 ℃ for 30min compared with the MgH 2 ball-milling at 300 ℃ for 30 min.
Comparative example 2
A method for preparing MgH 2 -6NiCoN composite material, the procedure not specifically described is the same as in example 1, and DSC test is carried out on the composite material MgH 2 -6NiCoN and ball-milling MgH 2.
The DSC test results of MgH 2 -6NiCoN and MgH 2 are shown in figures 8-9, and the activation energy of the MgH2-6NiCoN composite material is reduced by 71kJ/mol compared with that of ball milling MgH 2.
Comparative example 3
A preparation method of MgH 2 -6NiCoN comprises the same steps as in example 1, wherein the steps are not specifically described, a sample after ball milling and a sample for absorbing and desorbing hydrogen after ball milling are prepared in a glove box, and then taken out for XRD test.
As shown in the XRD test results of MgH2-6NiCoN in FIG. 9, diffraction peaks of Mg 2 Co and Mg 2 Ni are detected notably in the XRD pattern of dehydrogenated MgH 2 -6NiCoN, which shows that MgH 2 reacts with Co and Ni to form Mg 2 Co and Mg 2 Ni during dehydrogenation, and that the rehydrogenated MgH 2 -6NiCoN contains not only MgH 2 but also Mg 2CoH5 and Mg 2NiH4 compared with the milled MgH 2 -6NiCoN, and proves that in-situ formed Mg 2 Co and Mg 2 Ni can absorb hydrogen to generate corresponding hydrides, and that reversible phase transformation of Mg 2Co/Mg2CoH5 and Mg 2Ni/Mg2NiH4 can be presumed to act as a 'hydrogen pump', thereby reducing reaction activation energy and promoting absorption and dissociation of hydrogen.
As is evident from the results of examples 1, comparative examples 1,2 and 3, there was a synergistic catalytic effect between in-situ formed Mg 2 Ni and Mg 2 Co, niCoN had a significant enhancement of the dehydrokinetics of MgH 2/Mg, mgH 2 -6NiCoN composite material 30min had a hydrogen release of 4.96wt% at 285℃and 4.83wt% H 2 absorption in 10min at 150℃and activation energy was reduced by 71kJ/mol compared to ball milling MgH 2, in-situ formed Mg 2 Co and Mg 2 Ni were present during the first dehydrogenation process, and the dissociation and recombination of hydrogen was accelerated by reversible phase transformation after rehydrogenation to further Mg 2CoH5 and Mg 2NiH4,Mg2Co/Mg2CoH5 and Mg 2Ni/Mg2NiH4, thus explaining the excellent hydrogen absorption/desorption kinetics of the composite material.
Claims (5)
1. The application of the hydrogen storage material of the bimetallic nitride catalyst doped with the magnesium hydride in the field of hydrogen storage is characterized in that the bimetallic nitride catalyst and the magnesium hydride are mixed according to a certain mass ratio, ball milling is carried out under a certain condition, and the hydrogen storage material of NiCoN catalyst doped with the magnesium hydride is obtained;
when the doping amount of the catalyst is 2-8wt%, the initial hydrogen release temperature of the system is reduced to 164-185 ℃, the hydrogen release amount reaches 6.1-6.5wt%, the system can completely release hydrogen at 330 ℃ during isothermal hydrogen release, the hydrogen release amount reaches 6.3-6.6wt% within 15min, and the hydrogen can be absorbed by the system at 5.2-5.8wt% within 50min even under the condition of low temperature of 150 ℃;
The catalyst comprises elements of Ni, co and N, and is in a nano flower shape.
2. The application of the bi-metal nitride catalyst doped with magnesium hydride as the hydrogen storage field is characterized in that the ball milling condition is that argon is used as a protective atmosphere, the ball-to-material ratio is 40:1, the ball milling rotating speed is 400-450r/min, and the ball milling time is 10-12h.
3. The application of the bimetallic nitride catalyst doped with magnesium hydride hydrogen storage material as the field of hydrogen storage, according to claim 1, wherein after recycling, the sample shows good reversibility of hydrogen storage and stable circularity, and after 10 times of circulation, the retention rate of the actual hydrogen capacity is 96% of the primary circulation capacity.
4. The use of a hydrogen storage material doped with magnesium hydride as claimed in claim 1 as a hydrogen storage field, wherein the preparation method of the bimetallic nitride catalyst comprises the following steps:
Step 1), dissolving Ni (NO 3)2·6H2 O and CoSO 4·7H2 O in deionized water, magnetically stirring, sequentially adding ammonium fluoride and urea into the solution, continuously stirring, transferring the solution into an autoclave for a period of time after complete dissolution, naturally cooling to room temperature, and collecting a hydrothermal sample deposit;
And 2) washing the precipitate with deionized water for several times, collecting the precipitate after centrifugation, then drying in vacuum overnight, sequentially transferring urea and the dried precipitate into a tube furnace, calcining for a period of time under flowing argon gas flow, naturally cooling to room temperature, collecting a sample, and transferring the sample into a glove box filled with Ar, thereby obtaining the bimetallic nitride catalyst NiCoN.
5. The application of the bimetallic nitride catalyst doped with magnesium hydride as the hydrogen storage field, according to claim 4, characterized in that in the step 1), ni (NO 3)2·6H2O 1mmol、CoSO4· 7H2 O is 1mmol, H 2 O is 30mL, ammonium fluoride is 5mmol and urea is 10mmol, the magnetic stirring time is between 30 and 60min, the dropping conditions of Ni (NO 3)2·6H2O、CoSO4·7H2O、NH4 F and urea are slow dropping in sequence, and the temperature keeping condition in the autoclave is 100 ℃ for 8H;
In the step 2), the washing condition is that deionized water is used for washing and centrifuging for 6-8 times, the centrifugal speed is 8000-9000 rpm, the centrifugal time is 5-10min, the drying condition is 60-100 ℃ for 10h, and the calcining condition is 450 ℃ for 2-3h under argon.
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