摘要
铂/L分子筛新型重整催化剂具有碱性、单功能与独特的孔结构。与双功能催化剂对比,它对n-C_6～n-C_8直链烷烃有极高的芳构化活性和选择性,其芳构化机理可能与双功能催化剂不同。本文应用正己烷(n-C_8)、正庚烷(n-C_7)、正辛烷(n-C_8),2-甲基己烷(2MHx)、甲基环戊烷(MCP)等探针分子,在脉冲微反装置上考察了它们在Pt/BaL催化剂上的芳构化性能和产物分布。提出烷烃分子(≥C_6)主链的1。
The activity of Pt/BaL zeolite catalysts for the aromatization of va rious hydrocarbon probes,such as C6-C8 normal alkanes,methylcyclo-pentane,hexene-1 and cyclohexane,is studied under different reaction conditions.The pulse reaction of various probes shows the aromatization of the alkanes via neither the extended-eyelization mechanism nor the step-by-step dehydrogenation one.The aromatization via 1,6 adsorbed species is taken into account and the highly dispersed Pt sites as well as the special structure of L zeolite make a main contribution to the reaction pathway via direct cyclization mechanism.
关键词
铂催化剂
分子筛
烷烃
芳构比
Platinum catalyst
molecular sieve
aromatization of alkane
reaction mechanism
