CuFeAl-composite catalysts of oxidation of gasification products of solid fuels: In situ XAS and XRD study. (October 2020) - Saraev, A.A.
Abstract: The reduction of high-active FeAl and CuFeAl composite catalysts was investigated in situ by XRD and XAS in the temperature range between 100 and 600 °C. It was found that the fresh catalysts consist of Fe2 O3 and Al2 O3 phases only. The Al 3+ cations partially dissolute in the Fe2 O3 lattice. The addition of copper to the Fe-Al catalyst leads to formation of highly dispersed CuO nanoparticles and mixed oxide with a spinel-type crystalline structure similar to that of CuFe2 O4 . The low-temperature reduction of Cu 2+ to Cu 0 accelerates the Fe2 O3 → Fe3 O4 and FeO → Fe 0 transformations. In the presence of oxygen we did not observe the reduction of Cu and Fe to the metallic state. This means that the oxidation of CO over FeAl and CuFeAl composite catalysts proceeds via a redox mechanism. Highlights: High-active FeAl and CuFeAl composite catalysts were investigated by XAS and XRD. Copper leads to increase the catalytic activity of iron based catalysts. Oxidation of CO over FeAl and CuFeAl catalysts proceeds via redox mechanism.