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Title: Catalytically active Au-O(OH)x- species stabilized by alkali ions on zeolites and mesoporous oxides

Abstract

We report that the addition of alkali ions (sodium or potassium) to gold on KLTL-zeolite and mesoporous MCM-41 silica stabilizes mononuclear gold in Au-O(OH)x-(Na or K) ensembles. This single-site gold species is active for the low-temperature (< 200°C) water-gas shift (WGS) reaction. Unexpectedly, gold is thus similar to platinum in creating –O and –OH linkages with more than eight alkali ions and establishing an active site on various supports. The intrinsic activity of the single-site gold species is the same on irreducible supports as on reducible ceria, iron oxide, and titania supports; apparently all sharing a common, similarly structured gold active site. This finding paves the way for using earth-abundant supports to disperse and stabilize precious metal atoms with alkali additives for the WGS and potentially other fuel processing reactions.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1392579
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 346; Journal Issue: 6216; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

Citation Formats

Yang, M., Li, S., Wang, Y., Herron, J. A., Xu, Y., Allard, L. F., Lee, S., Huang, J., Mavrikakis, M., and Flytzani-Stephanopoulos, M. Catalytically active Au-O(OH)x- species stabilized by alkali ions on zeolites and mesoporous oxides. United States: N. p., 2014. Web. doi:10.1126/science.1260526.
Yang, M., Li, S., Wang, Y., Herron, J. A., Xu, Y., Allard, L. F., Lee, S., Huang, J., Mavrikakis, M., & Flytzani-Stephanopoulos, M. Catalytically active Au-O(OH)x- species stabilized by alkali ions on zeolites and mesoporous oxides. United States. doi:10.1126/science.1260526.
Yang, M., Li, S., Wang, Y., Herron, J. A., Xu, Y., Allard, L. F., Lee, S., Huang, J., Mavrikakis, M., and Flytzani-Stephanopoulos, M. Thu . "Catalytically active Au-O(OH)x- species stabilized by alkali ions on zeolites and mesoporous oxides". United States. doi:10.1126/science.1260526.
@article{osti_1392579,
title = {Catalytically active Au-O(OH)x- species stabilized by alkali ions on zeolites and mesoporous oxides},
author = {Yang, M. and Li, S. and Wang, Y. and Herron, J. A. and Xu, Y. and Allard, L. F. and Lee, S. and Huang, J. and Mavrikakis, M. and Flytzani-Stephanopoulos, M.},
abstractNote = {We report that the addition of alkali ions (sodium or potassium) to gold on KLTL-zeolite and mesoporous MCM-41 silica stabilizes mononuclear gold in Au-O(OH)x-(Na or K) ensembles. This single-site gold species is active for the low-temperature (< 200°C) water-gas shift (WGS) reaction. Unexpectedly, gold is thus similar to platinum in creating –O and –OH linkages with more than eight alkali ions and establishing an active site on various supports. The intrinsic activity of the single-site gold species is the same on irreducible supports as on reducible ceria, iron oxide, and titania supports; apparently all sharing a common, similarly structured gold active site. This finding paves the way for using earth-abundant supports to disperse and stabilize precious metal atoms with alkali additives for the WGS and potentially other fuel processing reactions.},
doi = {10.1126/science.1260526},
journal = {Science},
issn = {0036-8075},
number = 6216,
volume = 346,
place = {United States},
year = {2014},
month = {11}
}

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