Carbon monoxide oxidation catalyst

FIELD: oxidation catalysts.

SUBSTANCE: invention relates to carbon monoxide oxidation catalysts suitable to remove carbon monoxide from emission gases. Catalyst according to invention contains cadmium telluride and indium antimonide at weight ratio 95:5.

EFFECT: increased activity and selectivity of catalyst.

1 tbl

 

The invention relates to catalysts for the oxidation of carbon oxide (II), promising to clean exhaust gases from him.

Known catalysts for CO oxidation, containing in most cases, the platinum group metals, or a mixture of them with oxides of metals of variable valence (Mn, Fe, Cu, Cr, CO and others), or mixtures of metal oxides with bentonite clay (Patent RU №2156164. The catalyst for the oxidation of carbon monoxide / Lauretana, Agilitiy, 2000), or metal alloys with rare earth elements (Patent RU №2171712. The catalyst for the oxidation of carbon monoxide / Vienonen, Iaaou, Vgideo and others, 2001).

The disadvantages of these catalysts are complex, expensive raw materials, the complexity of fabrication and high temperature most notable catalytic conversion.

The objective of the invention is to increase the activity and selectivity of the catalyst towards the oxidation of carbon monoxide.

This technical result is achieved by the fact that the catalytic oxidation of carbon monoxide, according to the claimed technical solution contains cadmium telluride and indium antimonide mass ratio of 95:5.

The catalyst, which includes cadmium telluride and indium antimonide, provides increased activity, resulting in higher degrees of transformation WITH the ome 2.3 times and selectivity in the oxidation of CO: the main product is the CO 2.

The catalyst used in the oxidation of carbon monoxide in the following way. In the reaction tube pulse catalytic installation load of 1 g of catalyst and directly before it activates at 200°in a stream of argon for 2 hours then through the reaction tube with a fixed bed of catalyst is passed, the reaction mixture is in a ratio WITH:2=1:2 at a pressure of 1 ATM. The carrier gas may be argon or air. The volumetric rate of the carrier gas supply 1.5 l/H. the Reaction is carried out in the temperature range from 20 to 250°C. Analysis of the reaction products is carried out chromatographically.

Studies have shown that the use of the claimed catalyst for the main reaction product is the CO2.

The test results of the catalyst shown in the table.

As can be seen from the table, the proposed catalyst composition of CdTe:InSb=95:5 at 100°possesses a high activity (up to 82%) and selectivity (up to 100%) in the reaction of oxidation of carbon to CO2.

The technology of manufacturing the catalyst is simple and therefore, easy.

To obtain 1 g of the catalyst of 0.05 g and 0.95 g of finely dispersed powders of indium antimonide and cadmium telluride are thoroughly mixed and placed in a quartz ampoule. Then the ampoule pumped up residual is th pressure ˜ of 0.13 PA and sealed. Sealed vials of substances are heated in the furnace, vibration stirring at 1000°C for 20 hours the catalyst is crushed in an agate mortar to a particle diameter of 1-1 .5 mm

The catalyst for the oxidation of carbon monoxide containing cadmium telluride and indium antimonide at a mass ratio of 95:5.



 

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