Obtaining of nanocatalizers for low-temperature conversion of oxide carbon (CuO/ZnO/Al2O3) with reduced copper content
Abstract
The main goal of the work was to reduce the content of copper (in terms of copper (II) oxide) in the composition of the conversion catalyst, and to preserve high catalytic and physico-mechanical characteristics. As an alternative to the known technology for producing oxide catalysts from precursors of metal hydroxocarbonates, there have been selected a manner in which the precursor is copper/zinc hydroxocarbonate. It has been shown that of the many salts obtained from precursorsmetal hydroxocarbonates, copper/zinc double hydroxocarbonate with an aurichalcite structure is most effective. The decomposition of these compounds results in the formation of nanosized metal copper clusters, which have a high specific surface area and high activity in the redox reaction of carbon monoxide conversion with water vapor to produce hydrogen. The coprecipitation conditions and the structure of copper/zinc hydroxocarbonate determine the subsequent activity of the oxide catalyst. A technology for producing nanocatalysts for low-temperature conversion of carbon monoxide with a low (up to 20 %from 54 to 34 wt.%) opper content was proposed and the conditions for obtaining a precursor and catalyst were optimized.