Al-modified Mesoporous SiO2-matrix-supported Uniform CeO2 Nanodots with Superior Catalytic Efficiency in DCE Combustion

Jianwei Deng, Fan Xue, Can Huo, Yuanbiao Zhao, Lei Li, Qing Liu, Mifen Cui, Xu Qiao, Zhaoyang Fei

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Adjusting the acidity and/or oxygen species on the surface of metal oxide nanostructures could fabricate the high active and durable catalysts for the combustion of chlorinated volatile organic compounds (CVOCs). Herein, Al-modified mesoporous SiO2 matrix supported uniform CeO2 nanodots (CeO2@xAlSiO2) was synthesized and evaluated in dichloroethane (DCE) catalytic combustion. From the systematic study of the texture structure, surface properties, and catalytic activity, we deduced that the improved surface acidity and oxygen species activity enhanced the DCE conversion and reduced the formation of chlorinated organic byproduct, while increasing the formation of the desired product, HCl. The optimized CeO2@0.5AlSiO2 sample showed superior activity (90 % conversion of DCE at 260 °C), excellent durability (at 280 °C for 60 h) and good tolerance towards moisture (in 1 % and 3 % moisture for 10 h, respectively). Our work identified the important role of surface acidity and oxygen species over these functionalized catalysts, providing guidance for the advanced catalyst design.

Original languageEnglish
Article numbere202200708
JournalChemistrySelect
Volume7
Issue number17
DOIs
StatePublished - 6 May 2022

Keywords

  • catalytic combustion
  • mesoporous materials
  • nanoparticles
  • oxygen species
  • surface acidity

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