Surface oxygen vacancy induced selective conversion of syngas to propane over ZnM2O4 spinel/SAPO-34 composite catalysts

Xiuyun Jiang, Zhihao Liu, Jiaming Liang*, Chengwei Wang, Qingxiang Ma, Guangbo Liu, Xiaoyu Guo, Shuhei Yasuda, Yingluo He, Guohui Yang, Noritatsu Tsubaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Converting syngas to high-valued hydrocarbons is considered an ideal route to alleviate the excessive use of oil resources. However, regulating the hydrocarbon product distribution, especially for a high selectivity of a single product, remains a great challenge. Herein, we report a series of composite catalysts integrated with Zn-based spinel oxide (ZnM2O4) and zeolites for the highly selective synthesis of propane from syngas. A high selectivity of 68.6 % for propane and 77.5 % selectivity for LPG (propane and butane) in hydrocarbons (CO2 free) are obtained over ZnAl2O4/SAPO-34 composite catalyst at CO conversion of 41.1 %. Moreover, such performance is virtually unchanged in 100 hours of reaction evaluation. Studies of the microstructure and chemical properties of the ZnAl2O4 spinel oxide catalyst show that the strong electron interaction between Zn–O–Al creates more abundant oxygen vacancies and stronger hydrogen dissociation capacity. Consequently, more adsorbed CO is stepwise activated and hydrogenated with the dissociated H species to HCOO*, CH3O* intermediates and methanol, which are further transformed to propane on the acid site of SAPO-34 zeolite.

Original languageEnglish
Article number125126
JournalApplied Catalysis B: Environmental
Volume367
DOIs
StatePublished - 2025/06/15

Keywords

  • Composite catalyst
  • LPG
  • Oxygen vacancy
  • Propane
  • Syngas

ASJC Scopus subject areas

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

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