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

DOI: 10.1016/j.jcat.2018.09.002 DOI Help

Authors: Tugce Ayvali (University of Oxford) , Lin Ye (University of Oxford) , Simson Wu (University of Oxford) , Benedict T. W. Lo (University of Oxford) , Chen Huang (University of Oxford) , Bin Yu (University of Oxford) , Giannantonio Cibin (Diamond Light Source) , Angus I. Kirkland (University of Oxford) , Chiu Tang (Diamond Light Source) , Abdulaziz A. Bagabas (King Abdulaziz City for Science and Technology (KACST)) , S. C. Edman Tsang (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Catalysis , VOL 367 , PAGES 229 - 233

State: Published (Approved)
Published: November 2018
Diamond Proposal Number(s): 16358 , 14647

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.

Journal Keywords: Catalysis; Gold; Propylene epoxidation; TS-1; Synchrotron XRD

Subject Areas: Chemistry


Instruments: B18-Core EXAFS , I11-High Resolution Powder Diffraction