丙烷无氧脱氢Co基催化剂的研究进展

Research progresson the dehydrogenation of propane over Co based catalysts

近年来Co基催化剂应用于丙烷脱氢反应展现出高于传统贵金属Pt基催化剂的催化活性,且逐渐成为研究热点。由于Co物种的多价态和多种配位的复杂性,导致其活性位结构和反应机理的认识不统一,尤其是在高温和还原性气氛(丙烷及其衍生物)条件下,CoO_(x)活性位通常被不同程度地还原,容易转变为高度分散的Co^(2+)物种或超小金属Co,通常被认为是高效的活性位点。根据催化剂载体不同,对Co基丙烷脱氢催化剂进行分类,总结不同配位环境、分散度、价态的Co物种及对丙烷脱氢C-H活化、丙烯选择性和催化剂稳定性的影响,为进一步设计高效的Co基丙烷脱氢催化剂提供参考。

In recent years,Co-based catalysts have been applied to propane dehydrogenation,which exhibit higher catalytic activity than traditional precious metal Pt-based catalysts,and has gradually become a research focus.The complexity of multivalent states and multiple coordination of cobalt species leads to the inconsistent understanding of its active site structure and reaction mechanism.Especially under the reaction conditions of high temperature and reducing atmosphere(propane and its derivatives),CoO_(x)active sites are usually partially reduced in different degrees and easily converted into highly dispersed Co^(2+)species or ultra-small metal Co,which are usually considered as efficient active sites.In this paper,the Co-based propane dehydrogenation catalysts were classified according to the different catalyst support.Effects of different coordination environments,dispersions,and valence Co species on C-H activation,propylene selectivity and catalyst stability of propane dehydrogenation were systematically summarized,which provides a certain reference for further design of efficient Co-based propane dehydrogenation catalysts.