Journal
SCIENCE
Volume 346, Issue 6216, Pages 1498-1501Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1260526
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences (DOE-BES) [DE-FG02-05ER15730]
- Center for Nanophase Materials Sciences (CNMS) - Scientific User Facilities Division, DOE-BES
- Center for Nanophase Materials Sciences (CNMS) - U.S. DOE Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, Propulsion Materials Program
- Advanced Photon Source at ANL [DE-AC02-06CH11357]
- DOE-BES, Office of Chemical Sciences
- Department of Energy's Office of Biological and Environmental Research located at PNNL
- U.S. Department of Energy, Office of Science [DE-AC02-06CH11357, DE-AC02-05CH11231]
- USyd Early Career Researcher Scheme
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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 degrees 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.
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