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Observation of Heptamethylbenzenium Cation over SAPO-Type Molecular Sieve DNL-6 under Real MTO Conversion Conditions

2011; American Chemical Society; Volume: 134; Issue: 2 Linguagem: Inglês

10.1021/ja209950x

1943-2984

Jinzhe Li, Yingxu Wei, Jingrun Chen, Peng Tian, Xiong Su, Shutao Xu, Qi Yue, Quanyi Wang, You Zhou, Yanli He, Zhongmin Liu,

Mesoporous Materials and Catalysis

The heptamethylbenzenium cation (heptaMB(+)) has been speculated to be one of the most important active intermediates involved in the "hydrocarbon pool" mechanism of methanol-to-olefin (MTO) conversion. By the use of DNL-6, a newly synthesized SAPO-type molecular sieve with large cavities, heptaMB(+) has for the first time been directly observed during methanol conversion under real working conditions. (13)C-labeling experiments suggested that olefin formation mediated by heptaMB(+) mainly follows the side-chain mechanism.