Journal
JOURNAL OF CATALYSIS
Volume 344, Issue -, Pages 784-794Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.08.011
Keywords
Bimetallic catalyst; Monometallic sites; Interfacial sites; Photocatalysis; Visible light response; Active sites; Reverse water gas shift (RWGS) reaction
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Funding
- NSF through the University of Wisconsin Materials Research Science and Engineering Center [DMR-1121288]
- US Department of Energy, Office of Basic Energy Sciences [DE-SC0014058]
- Great Lakes Bioenergy Research Center (DOE Office of Science) [BER-DE-FC02-07ER64494]
- Wisconsin Materials Research Science and Engineering Center [DMR-1121288]
- U.S. Department of Energy (DOE) [DE-SC0014058] Funding Source: U.S. Department of Energy (DOE)
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Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio < 0.3). Mo deposition changed the apparent activation energy and CO2 and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO2, CO, and H-2, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1 mint under dark and light conditions at 473 K, respectively, whereas the intrinsic activity of a Pt-MoOx site is increased to 22.7 and 160 min(-1) under dark and light conditions at 473 K, respectively. (C) 2016 Elsevier Inc. All rights reserved.
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