Sn-induced CuO-CeO_2 catalysts with improved performance for CO preferential oxidation in H_2-rich streams

摘要

Sn modified CuO-CeO2 catalysts with different Sn loadings were prepared by a facile, green and solvent-free method. The effect of Sn/Ce ratio over Sn-Cu-Ce-x (x = 0, 1, 2.5, 5, 7.5) samples on CO activity and O2 selectivity was investigated. The samples were characterized by various techniques using N2-adsorption/desorption, XRD, H2-TPR, XPS, Raman and in-situ DRIFTS. It was revealed that stronger interaction between acitve sites and support, higher amounts of Sn2+ and Ce3+, associated with increased amount of oxygen vacancies, were observed on the catalyst of Sn-Cu-Ce-5. As a result, the optimized catalyst displayed an excellent catalytic performance even in the presence of CO2 and H2O. In this sense, probing the Sn modified CuO-CeO2 catalyst can elucidate some useful keys for the