"Catalytically active Au-O(OH)x-species stabilized by alkali ions on ze" by Ming Yang, Sha Li et al.

Faculty Publications

Title

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

Authors

Ming Yang, Department of Chemical and Biological Engineering, Tufts University, MA 02155, USA.
Sha Li, Department of Chemical and Biological Engineering, University of Wisconsin-Madison, WI 53706, USA.
Yuan Wang, Department of Chemical and Biological Engineering, Tufts University, MA 02155, USA.
Jeffrey A. Herron, Department of Chemical and Biological Engineering, University of Wisconsin-Madison, WI 53706, USA.
Ye Xu, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
Lawrence F. Allard, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
Sungsik Lee, X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
Jun Huang, School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
Manos Mavrikakis, Department of Chemical and Biological Engineering, University of Wisconsin-Madison, WI 53706, USA.
Maria Flytzani-Stephanopoulos, Department of Chemical and Biological Engineering, Tufts University, MA 02155, USA. maria.flytzani-stephanopoulos@tufts.edu.

Document Type

Article

Publication Date

12-19-2014

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 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.

Publication Source (Journal or Book title)

Science (New York, N.Y.)

First Page

1498

Last Page

501

Recommended Citation

Yang, M., Li, S., Wang, Y., Herron, J. A., Xu, Y., Allard, L. F., Lee, S., Huang, J., Mavrikakis, M., & Flytzani-Stephanopoulos, M. (2014). Catalytically active Au-O(OH)x-species stabilized by alkali ions on zeolites and mesoporous oxides. Science (New York, N.Y.), 346 (6216), 1498-501. https://doi.org/10.1126/science.1260526

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