[an error occurred while processing this directive]
固体核磁共振技术在甲醇制烯烃反应中的应用
高树树1,2,徐舒涛1,*(),魏迎旭1,刘中民1
Applications of Solid-State Nuclear Magnetic Resonance Spectroscopy in Methanol-to-Olefins Reaction
Shu-shu GAO1,2,Shu-tao XU1,*(),Ying-xu WEI1,Zhong-min LIU1

图4. (a) 275 ℃下，13C-甲醇在H-SSZ-13催化剂上转化的原位13C MAS NMR谱图，其中154、245 ppm为五甲基环戊烯基正离子(PMCP+)特征峰，0~40 ppm为烷烃类物种；(b) ①以甲醇为原料，通过直接反应机理生成初始乙烯；②初始乙烯产生MCP类物种；③ MCP类物种与甲醇共反应生成PMBs物种；④通过间接机制包括芳烃循环、烯烃循环和环戊二烯循环生成烯烃[47]

Fig.4. (a) In situ 13C MAS NMR spectra of 13CH3OH reaction over H-SSZ-13 catalyst at 275 ℃, the characteristic signals at 154 and 245 ppm illustrate the formation of pentamethylcyclopentenyl cation (PMCP+), 0~40 ppm are assigned to the paraffin; (b) ① The initial ethene is generated from methanol by direct mechanism; ② MCP species are produced from initial ethene; ③ PMBs species are produced from the co-reaction of MCP species and methanol; ④ The olefins are formed via indirect mechanism including of aromatics-based, alkenes-based, and cyclopentadienes based cycles[47]