Solvent-Free Synthesis Enables Encapsulation of Subnanometric FeOx Clusters in Pure Siliceous Zeolites for Efficient Catalytic Oxidation Reactions

Jiajie Ye, Xuan Tang, Lu Cheng, Shoujie Zhang, Wangcheng Zhan, Yanglong Guo, Li Wang, Xiao Ming Cao, Kuan Wen Wang, Sheng Dai, Yun Guo

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Metal/metal oxide clusters possess a higher count of unsaturated coordination sites than nanoparticles, providing multiatomic sites that single atoms do not. Encapsulating metal/ metal oxide clusters within zeolites is a promising approach for synthesizing and stabilizing these clusters. The unique feature endows the metal clusters with an exceptional catalytic performance in a broad range of catalytic reactions. However, the encapsulation of stable FeOx clusters in zeolite is still challenging, which limits the application of zeolite-encapsulated FeOx clusters in catalysis. Herein, we design a modified solvent-free method to encapsulate FeOx clusters in pure siliceous MFI zeolites (Fe@MFI). It is revealed that the 0.3−0.4 nm subnanometric FeOx clusters are stably encapsulated in the 5/6-membered rings intersectional voids of the pure siliceous MFI zeolites. The encapsulated Fe@MFI catalyst with a Fe loading of 1.4 wt % demonstrates remarkable catalytic activity and recycle stability in the direct oxidation of methane, while also promoting the direct oxidation of cyclohexane, surpassing the performance of conventional zeolite-supported Fe catalysts.

Original languageEnglish
Pages (from-to)24691-24702
Number of pages12
JournalACS Applied Materials and Interfaces
Volume16
Issue number19
DOIs
StatePublished - May 15 2024
Externally publishedYes

Keywords

  • FeO cluster
  • confinement synthesis
  • direct oxidation of methane
  • pure siliceous zeolite
  • solvent-free synthesis

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