中文摘要：

采用固体多核 13C, 27Al 及 29Si MAS NMR 结合吸附气体 Xe 后的 129Xe NMR, 详细研究了乙烯和 2-丁烯歧化生成丙烯反应过程中 6%Mo/Hβ-Al2O3 催化剂上积炭的类型和落位. 结果表明, 积炭以饱和烷烃为主, 并随着反应的进行生成更多的支链烷烃, 积炭主要分布在 Hβ 分子筛上, 并主要落位在分子筛的交叉孔道处.

英文摘要：

Multinuclear solid-state ^13C, ^27Al, and ^29Si MAS NMR and 129Xe NMR were used to study the carbon deposition on the 6%Mo/HD-A1203 catalyst in metathesis of ethene and 2-butene to propene. The results showed that the coke composition was aliphatic hydrocarbons, and the most of them was present in Hβ zeolite instead of in Al2O3. The ^129Xe NMR experiments clearly revealed that the deposited carbon was located at the positions of channel intersections in Hβ zeolite, which caused the deactivation of the catalyst.