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.
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.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2010年第2期186-190,共5页
基金
国家重点基础研究发展计划(973计划
2009CB623507)
国家自然科学基金(20773120)
关键词
烯烃歧化
钼
氧化铝
HΒ分子筛
丙烯
固体核磁共振
氙
olefin metathesis
molybdenum
alumina
Hβ zeolite
propene
solid-state nuclear magnetic resonance
^129Xe
