碘酸改性溶胶凝胶法制备CuO/CeO2催化剂及富氢条件下催化CO氧化

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 Prepared by Iodic Acid Improved Sol-gel Method for Preferential CO Oxidation

CuO/CeO₂ catalysts were prepared by iodic acid improved sol-gel method, and the catalytic performances for the preferential oxidation of CO in excess hydrogen were evaluated. Compared with the conventional 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.