Influence of Al Coordinates on Hierarchical Structure and T Atoms Redistribution during Base Leaching of ZSM-5

Junjie Li, Min Liu, Xinwen Guo, Shu Zeng, Shutao Xu, Yingxu Wei, Zhongmin Liu, Chunshan Song

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Al coordinates in ZSM-5 showed significant effects on hierarchical structure and T atoms redistribution during NaOH/TPAOH treatment and different catalytic performances in the methanol-to-propylene reaction. NaOH treatment of parent ZSM-5 with a few extra-framework Al sites mainly involved the desilication process, while an additional alumination process was observed when some Al3+ was added into the NaOH solution, which resulted in mesoporous crystals with intact outer shells. Dealumination-realumination and desilication processes occurred with ZSM-5 with distorted four-coordinate, five-coordinate, or six-coordinate Al sites. For TPAOH treatment, the desilication-recrystallization process occurred with parent ZSM-5 and resulted in hollow crystals with ultrasilica shells via Si redistribution, consequently 2.5 times the lifetime of parent ZSM-5 by restricting external coke deposition. By comparison, desilication, dealumination, and (Si, Al)-recystallization were observed for ZSM-5 with distorted four-coordinate Al sites, involving both Si and Al atoms redistribution processes resulting in abundant mesopores and a high-silica outer surface, which showed almost 5 times the lifetime of parent ZSM-5.

Original languageEnglish (US)
Pages (from-to)15375-15384
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume57
Issue number45
DOIs
StatePublished - Nov 14 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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