RU1836145C - Method of obtaining palladium catalyzer - Google Patents

Abstract

SUMMARY OF THE INVENTION: Activated carbon is treated with dimethylformamide. The treated activated carbon is then impregnated with an aqueous solution of palladium chloride. Palladium recovery is carried out in a boiling water bath.

Description

6) E. Alekseevsky. A method of preparing a fladium catalyst for industrial purposes. Housing and communal services, 1929, t. 2, No. 6. Copyright certificate of the USSR - 166307, cl. In 01 J 37/02, 1964. I Copyright certificate of the USSR Г | г 417150, cl. In 01 J 23/44, 1972.

| The invention relates to methods for producing metal supported activated carbon catalysts. I The widespread use of palladium catalysts for the afterburning of hydrogen, carbon monoxide, in the reactions of hydrogenation, dehydrogenation, and isomerization, calls for improving the existing methods for their preparation in order to increase the specific activity and selectivity.

 An object of the invention is to simplify the vi | HMe process for the preparation of a palladium catalyst.

; This goal is achieved by the fact that in the Known Method, the carbon sorbent is pre-impregnated with dimethylformamide and then with an aqueous solution of palladium chloride, followed by a boiling water bath.

A significant difference of the proposed method is that the preliminary impregnation of the support with dimethylformamide allows the palladium chloride solution to be more uniformly distributed over the surface of the carbon support upon contact. To transfer the palladium to the metallic state, it is sufficient to heat the carrier with the compound formed on its surface in a boiling water bath.

The proposed method is simpler and more convenient, and the catalyst obtained by the proposed method provides 50% oxidation of carbon monoxide at concentrations of 0.2-4 vol.% (At 180 ° C and 100% at 200 ° C.

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PRI me R 1. Preparation of a catalyst containing 1 wt.% Palladium.

The PM-15 grade coal taken in the amount of 30 cm (12.2 g) was poured with an equal volume (30 cm of dimethylformamide (GOST 20289-74) so that its grains were completely covered with liquid and left for 2 hours. The carrier is separated from the excess dimethylformamide by decantation. A solution of palladium chloride is prepared by dissolving 0.2017 g of palladium chloride in 30 cm of water, acidified with a solution of hydrochloric acid to pH 3, the Carrier modified with dimethylformamide is immersed for 5 min in the prepared solution of palladium chloride . Moreover, in the pores of the carrier is formed and one the palladium dichlorobisdimethylformamide complex compound is regularly adsorbed on the surface. The selected ratio between the palladium solution and the carrier in volume equal to 1: 1 ensures complete absorption of palladium from the solution. The palladium complex is reduced to metal by transferring the mixture

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a carrier with the remainder of a palladium chloride solution in a boiling water bath. Heating for 2 hours ensures complete reduction of palladium to metal without the use of an additional reducing agent. The completion of the reduction process is judged by the complete disappearance of the red-brown color of the palladium chloride solution. After reduction, the catalyst is washed with water until the reaction to the chloride ion disappears, and it is dried in a cabinet at 100-110 ° C.

Claims (1)

The resulting catalyst with a content of 1 wt.% Palladium is ready for use. SUMMARY OF THE INVENTION A method for producing a palladium catalyst comprising impregnating activated carbon with an aqueous solution of palladium chloride and subsequently reducing palladium, characterized in that, in order to simplify the method, the activated carbon is treated with dimethylformamide and the palladium is reduced to boiling water Noah bath.