Mononuclear gold species anchored on TS-1 framework as catalyst precursor for selective epoxidation of propylene

Tuğçe Ayvalı, Lin Ye, Simson Wu, Benedict T.W. Lo, Chen Huang, Bin Yu, Giannantonio Cibin, Angus I. Kirkland, Chiu Tang, Abdulaziz A. Bagabas, S. C.Edman Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

Deposition of gold on supports can produce catalytically active forms of gold as well as spectators, but previous understanding of the nature of active immobilized precursors is poor. By using synchrotron X-ray powder diffraction (SXRD) and X-ray absorption spectroscopy (XAS) techniques, we report a novel synthesis and structural elucidation of atomically dispersed gold species anchored to the internal surface of TS-1 as K+Au(OH)2Na+(Of)3 (“f” signifies the framework atoms of TS-1 in the formula.). It is found that the choice of alkali ions plays a crucial role in nucleation and stabilization of the atomic precursor. These anchored single Au upon controlled reduction in H2 can form uniform gold clusters in direct contact with the TS-1 surface containing isolated Ti sites: their interface exhibits excellent specificity and stability towards epoxidation of propylene in H2/O2 due to synergetic effect.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalJournal of Catalysis
Volume367
DOIs
Publication statusPublished - Nov 2018

Keywords

  • Catalysis
  • Gold
  • Propylene epoxidation
  • Synchrotron XRD
  • TS-1

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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