铜离子的引入对甲烷无氧芳构化催化剂Mo/CuH-ZSM-5中Mo物种化学状态的影响

对比考察了Mo/CuH-ZSM-5和Mo/H-ZSM-5催化剂的甲烷无氧芳构化性能,并用XRD,XPS,ESR等多种测试手段对反应前后催化剂上的Mo物种及铜助剂的价态变化进行了详细研究,发现Cu(Ⅱ)部分取代H-ZSM-5交换位上的H⁺后,抑制了活性组分MoO₃的还原,而Cu物种自身被还原,进而将这种价态变化与催化剂的活性进行了关联.

The Effect of Cu Species on the Chemical State of Mo in the Mo/CuH-ZSM-5 Catalyst for Methane Non-oxidative Aromatization

The catalytic performance of Mo/CuH ZSM 5 was compared with that of Mo/H ZSM 5 for methane aromatization in the absence of oxygen. The Cu ions acted as promoters, and the activity and stability of catalysts for methane aromatization were enhanced to some extent. The fresh and reacted catalysts was studied by XRD, ESR and XPS methods, and it is found that by the addition of Cu species, the reduction of MoO 3 was suppressed and the Cu species itself was reduced. It is supposed that the Mo species with a higher oxidative state is responsible for the activation and conversion of methane.