碘酸改性溶胶凝胶法制备CuO/CeO_2催化剂及富氢条件下催化CO氧化

CuO /CeO_2 Catalysts Prepared by Iodic Acid Improved Sol-gel Method for Preferential CO Oxidation

采用一种碘酸改性的柠檬酸溶胶-凝胶法制备了CuO/CeO2催化剂,研究其在富氢气氛中CO优先氧化反应(CO-PROX)的催化活性.与传统柠檬酸溶胶-凝胶法制备的催化剂相比,碘酸改性溶胶-凝胶法制备的催化剂活性更好.程序升温还原、X射线衍射、透射电子显微镜和X射线光电子能谱等表征证明该催化剂粒径较小,表面含有更多的Ce3+及还原性氧化铜物种,有利于提高催化剂的催化活性.

CuO/CeO2 catalysts were prepared by iodic acid improved sol-gel method, and the catalytic per- formances for the preferential oxidation of CO in excess hydrogen were evaluated. Compared with the conven- tional catalysts, the catalytic activities of iodic acid modified catalysts were markedly improved. The catalysts were characterized by a series of techniques such as temperature-programmed reduction in H2 （ H2-TPR） , X-ray diffraction （ XRD）, transmission electron microscope （ TEM）, X-ray photoelectron spectroscopy analysis （XPS） and energy dispersive spectrometer（EDS）. It was found that the improved method offered catalysts with smaller crystallite size, higher dispersion, more surface actual content of Ce3~ and reduced CuO species, which led to improving the performance of catalysts.