Characterization and Catalytic Activity of CeO2-Ni/Mo/SBA-15 Catalysts for Carbon Dioxide Reforming of Methane

Abstract

A Ni/Mo/SBA-15 catalyst was modified with CeO 2 and compared with the unmodified catalyst. The catalysts were characterized by N 2 adsorption, CO 2 temperature-programmed desorption, H 2 temperature-programmed reduction, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. Both the Ni/Mo/SBA-15 and CeO 2 /Ni/Mo/SBA-15 catalysts gave good catalytic activities at atmospheric pressure. The CeO 2 impregnated Ni/Mo/SBA-15 catalyst exhibited excellent stability at 800 °C for 100 h on stream, and after the reaction, carbon deposits were not formed on the catalyst. The Ni/Mo/SBA-15 and CeO 2 /Ni/Mo/SBA-15 catalysts had a regular hexagonal mesoporous structure. The nickel species and the Ce-Mo oxide components were all in the SBA-15 mesopores. This prevented carbon deposition and sintering of the nickel species in the CeO 2 /Ni/Mo/SBA-15 catalyst. 考察了 CeO 2 修饰及未修饰的 Ni/Mo/SBA-15 催化剂在 CH 4 -CO 2 重整上的催化性能并采用 N 2 吸脱附、CO 2 程序升温脱附、H 2 程序升温还原、傅里叶红外光谱、X 射线衍射、扫描电子显微镜和 X 射线光电子能谱对催化剂进行了表征. 结果表明, 在常压, 800 ºC 条件下, 经过 100 h 在线评价后, Ni/Mo/SBA-15 和 CeO 2 /Ni/Mo/SBA-15 催化剂仍具有高的反应活性和规整的六方介孔结构, 其中 CeO 2 修饰的 CeO 2 /Ni/Mo/SBA-15 催化剂表面没有积炭形成, 表明 CeO 2 的加入促进了 Ni 物种在 SBA-15 介孔分子筛表面的分散, 从而阻止了 Ce/Ni/Mo/SBA-15 催化剂上 Ni 的烧结和积炭. CeO 2 /Ni/Mo/SBA-15 catalysts have good stability in CO 2 reforming of methane. The addition of CeO 2 into Ni/Mo/SBA-15 enhanced the catalytic activity and coke resistance of the catalyst.