The effect of Gas Reaction Mixture on the Performance of CuO/Cu2(OH)3NO3(Co2 /Fe3 ) Composite Catalyst in the CO-PROX Reaction

摘要

The effect of gas reaction mixture composition on the performance of CuO/Cu_(2)(OH)_(3)NO_(3)(Co~(2+)/Fe~(3+)) composite catalyst in the CO-PROX reaction was examined. It was shown that the composition of the catalyst, which is formed at the pretreatment stage, changes with the increase of H2 content in the reaction mixture. According to PXRD data the catalyst formed contains two phases: CuO and Cu_(2)(OH)_(3)NO_(3), except that formed in the reaction mixture with excess of H2 and deficiency of O_(2), which contains three phases and possesses the lowest catalytic activity. Total CO conversion has been reached at 438 K and the selectivity towards CO oxidation was 94 % at this temperature. However, the composite catalyst has been found to be active and high selective only in the reaction mixture with a small excess of H_(2). The selectivity towards CO oxidation has been sharply decreased with increase of H_(2) content in the reaction mixture. The average particle size for composite catalyst studied was found to be about 20 nm. The increase of H_(2) content in the reaction mixture did not much change the crystallite size of the composite catalyst components.