SU582829A1 - Method of preparing zinc-copper-aluminium catalyst for carbon monoxide conversion - Google Patents

Description

one

This invention relates to the manufacture of catalysts for the conversion of carbon monoxide.

A known method of preparing a catalyst for this process, according to which an ammoniacal solution containing copper and zinc carbonate is prepared, is then heated to the evaporation temperature of ammonia, the resulting precipitate is separated and calcined.

The closest to this invention in its technical essence is the method of preparing a zinc-copper-aluminum catalyst by mixing copper, zinc and aluminum nitrate salts with an alkali metal carbonate or bicarbonate precipitator, followed by separating and washing the resulting precipitate, drying, calcining and pelleting the catalyst mass 1 2.

However, the catalyst obtained by this method has insufficient stability, equal to 65-70%.

The purpose of the invention is to obtain a catalysts with higher stability.

For: -1-o aluminum nitrate is mixed with oxalic acid and then with a precipitating solution - ammonia, ammonium nitrate or ammonium carbonate solution of copper and zinc, followed by separation and washing of the resulting precipitate, drying, calcining and pelletizing the catalyst mass.

The present method does not require thorough washing of insoluble metal compounds (hydroxides, carbonates and oxalates from the ammonium salt, since the residues of the latter easily decompose during heat treatment of the precipitate.

Example 1. Mix 3.14 kg A1 (f Oj) "EHEO; 0.90 kg H1C4O, and 10.0 liters of water to obtain a true solution.

2.96 L of a 25% ammonia solution are mixed; 1.24 kg C (K O;), 0.875 KrZnCHOj} - bnr and 7.0 l of water to obtain a true solution.

Both solutions are mixed, the precipitate thus obtained is separated by filtration from the mother liquor, washed, dried at and calcined at 00 ° C. 1.0 kg of catalyst composition is obtained based on metal oxide in wt.%: CU.O - 33, ZwO - 24, which is mixed with 2% graphite by weight by weight and tabletted into tablets 6x4 mm.

The catalyst is tested in the process of carbon monoxide conversion with water vapor on a model installation cjjo VIAH catalyst volume - 400 cm; pressure - 28 atm; temperature volume rate - 6000 h gss; steam: gas ratio is 0.6; composition of the source gas, vol.%: WITH 2.4; CO 21.6; Ar 1.0; N5 18.0; Hj 57.0.

Test result: residual content of carbon monoxide in the converted gas - 0.2 vol.%.

Example 2. Dissolve 267 g Cu and 240 rZnO in 2.15 l of a 25% aqueous solution of NH and mix the resulting solution of ammonia complexes with 0.5 l of water.

3.57 kg A1 (tJOg) - 9N.O; are mixed; 0.90 kg H2S2O -2 H2O and 10.0 L of WATER until a true solution is obtained.

Both solutions are mixed, the precipitate thus obtained is separated by filtration from the mother, washed off, dried at I -110 ° C and calcined at 140 ° C, 1.05 kg of the catalyst mass of the composition is calculated based on metal oxides in wt.%: CuO - 31.6, 2; BUT-22.6, AljOg- 45.8, which is mixed with 2% graphite by weight by weight and tabletted into tablets 6x4 mm.

The catalyst was tested under the conditions specified in Example 1.

The result of the test: the CO content of the output is 0.22% by volume.

Example 3. Dissolve 267 g Cu and 240 rZnO in 8.0 l of an aqueous solution containing 0.835 kg of MH. OH and 0.230 kg

(H.) j COg.

3.57 kg A1 (KOj), 0.45 kg of tiyCyOjf-HjO and 8.0 l of water are mixed until a true solution is obtained.

Both solutions are mixed, the precipitate thus obtained is separated by filtration from the mother liquor, washed with OTNHjNO, dried and then calcined at i 400 ° C. Get 1.05 kg of the catalyst mass of the composition based on the metal oxides in wt.%: CuO - 31,6; ZwO - 22.6; AljOg- 45,8, which is mixed with 2% graphite by weight by weight and tabletted into tablets 6x4 mm.

The catalyst is tested under the conditions specified in Example 1. The use of the present method of preparation of the catalyst provides the following advantages as compared with the known method:

a) a high degree of chemical homogeneity of the resulting catalyst;

b) high activity, stability

c) full reproducibility of catalysts for basic catalytic properties;

d) a sharp decrease in the amount of water and wastewater, the possibility of free disposal of the latter, for example, the use of ammonium nitrate as a mineral fertilizer.

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Claims (2)

1.Patent of France No. 2001-2a, cl. At 01 J, 11/00, 1969. 2. Patent of Great Britain No. 1366367, cl. B1E, 1974.