SU493241A1 - Ammonia synthesis catalyst - Google Patents

Description

(54) CATALYST FOR AMMONIA SYNTHESIS

molded water; 5.6 g of A1 (NO3) 3 -9H2O dissolve 3 51 ml of distilled water. The concentration of NHiOH is 10%.

The sedimentation is carried out by stirring the mixture at random with stirring, at ambient temperature and final pH 9. The precipitates are washed with distilled water until they are removed. The SO3 is filtered, and then the precipitate is transferred to a cup, where a solution of Ca {CH3SOO) 2 is added to the cup under constant stirring, dissolved in distilled water in the amount necessary to completely dissolve the sample.

Then the catalyst is molded, dried at room temperature in air for 24 hours, then at 50 ° C for 8 hours. After that, the catalyst is dried in a drying cabinet at 140 ° C for 6 hours and calcined at 600 ° C.

The resulting catalyst is impregnated with an aqueous solution of (CH 2 COO) g (for 5 g of catalyst, 0.1 g of Ni (CH3COO) 2, dissolved in 3 ml

.000 hour- On:

(istilirovannogo water), dried and calcined at a temperature of 500 ° C for 4 hours, impregnated with an alcoholic solution of KOH (for i, OI28 g catalyst 0,018 g KOH solution in 3 ml of absolute alcohol), then; tub and calcined at 140 ° C for an hour.

The catalyst in the oxidized state has the following chemical composition, weight. %:

Reso

97 1.5

HAO3 0.5 CaO 0.3

K20

NiO 0.8

In tab. Figure 1 shows the values of the output of the Amshak at a pressure of 50 and 100 atm and a volumetric rate (15,000 hours on the proposed: analyzer (sample I) as compared with the conventional industrial catalyst CA-1.

Table 1

Example 2. A catalyst is prepared in the manner described in Example 1, prior to the nickel addition step. Instead of impregnating the catalyst with a nickel salt solution, carbonic nickel is adsorbed onto the catalyst from the gas phase. Carbonyl deposition is carried out in a vacuum unit at an Ni (CO) 4 evaporation temperature of -25 ° C and a catalyst temperature of -10 ° C. The carbonyl nickel adsorbed on the catalyst is decomposed in the presence of oxygen.

After application of the nickel additive, the sample is impregnated with an alcoholic KOH solution (see Example I), dried and calcined at 140 ° C for 4 hours. The catalyst in the oxidized state has the following chemical composition, weight. %:

scrubber 2 Fe2Oz

96 1.0 Aloz Cao 0.5

K20 0.3

Nio

2.15

Sample 3 Fe2Oz

97 1.0 ALOZ CaO 0.5

K20

0.3

Nio

1.4

In tab. 2 compared the activity of samples 25 1SiSA-1.

table 2

.000 hour- At:, am

The output of ammonia,%, depending on temperature, ° C

Claims (1)

The increase in activity with the introduction of additional nickel at relatively low rates of aturah is of interest in connection with the methods of low-temperature catalysts with ammonia. The increase in activity is up to (gigantic due to an increase in specific activity, since the surface of the samples with; nickel addition and without nickel added prepared using the same method is the same. Formula of the invention for the synthesis of ammonia based on FegOs oxides , K2O and CaO, characterized in that, in order to increase the activity of the catalyst, it would additionally contain NiO in the following ratio of components, wt.%: P Q Base ABO3-3-3 K2O0.2-0.7 CaO0.3-2 NiO0.3 -3