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

doi:10.1016/j.jcat.2018.09.002

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

Department of Applied Biology and Chemical Technology

Research output: Journal article publication › Journal article › Academic research › peer-review

21 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⁺(O_f)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 language	English
Pages (from-to)	229-233
Number of pages	5
Journal	Journal of Catalysis
Volume	367
DOIs	https://doi.org/10.1016/j.jcat.2018.09.002
Publication status	Published - Nov 2018

Keywords

Catalysis
Gold
Propylene epoxidation
Synchrotron XRD
TS-1

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

More information

10.1016/j.jcat.2018.09.002

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@article{2a021e87ed1f41b094ec46697a453fc8,

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

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.",

keywords = "Catalysis, Gold, Propylene epoxidation, Synchrotron XRD, TS-1",

author = "Tuğ{\c c}e Ayvalı and Lin Ye and Simson Wu and Lo, {Benedict T.W.} and Chen Huang and Bin Yu and Giannantonio Cibin and Kirkland, {Angus I.} and Chiu Tang and Bagabas, {Abdulaziz A.} and Tsang, {S. C.Edman}",

note = "Funding Information: We thank King Abdulaziz City for Science and Technology (KACST) of Saudi Arabia for financial support and Dr. Alex W. Robertson of Oxford Materials for his help in microscopy. Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = nov,

doi = "10.1016/j.jcat.2018.09.002",

language = "English",

volume = "367",

pages = "229--233",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

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T1 - Mononuclear gold species anchored on TS-1 framework as catalyst precursor for selective epoxidation of propylene

AU - Ayvalı, Tuğçe

AU - Ye, Lin

AU - Wu, Simson

AU - Lo, Benedict T.W.

AU - Huang, Chen

AU - Yu, Bin

AU - Cibin, Giannantonio

AU - Kirkland, Angus I.

AU - Tang, Chiu

AU - Bagabas, Abdulaziz A.

AU - Tsang, S. C.Edman

N1 - Funding Information: We thank King Abdulaziz City for Science and Technology (KACST) of Saudi Arabia for financial support and Dr. Alex W. Robertson of Oxford Materials for his help in microscopy. Publisher Copyright: © 2018

PY - 2018/11

Y1 - 2018/11

N2 - 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.

AB - 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.

KW - Catalysis

KW - Gold

KW - Propylene epoxidation

KW - Synchrotron XRD

KW - TS-1

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U2 - 10.1016/j.jcat.2018.09.002

DO - 10.1016/j.jcat.2018.09.002

M3 - Journal article

AN - SCOPUS:85053933962

SN - 0021-9517

VL - 367

SP - 229

EP - 233

JO - Journal of Catalysis

JF - Journal of Catalysis

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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