XAFS characterization of Pt-Mo bimetallic catalysts for CO hydrogeneration

Journal Article · Tue Apr 15 04:00:00 EDT 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1578· OSTI ID:563476

Choi, Sun Hee; Lee, Jae Sung ^[1]

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1. Pohang Univ. of Science and Technology (Korea, Republic of)

Molybdenum-platinum bimetallic catalysts supported on alumina exhibited high activities in CO hydrogenation than supported monometallic catalysts of Mo or Pt. The structure of Mo-Pt bimetallic catalysts, which were prepared by incipient wetness impregnation of {gamma}-alumina with the variation of the order of Mo and Pt addition, was studied by XAFS and CO chemisorption. Since molybdenum contains overlapping contribution of the first and the second shells, EXAFS of these two shells and the first shell of platinum was analyzed for the bimetallic catalysts. EXAFS showed equivocally the formation of bimetallic bonds between Mo and Pt for all bimetallic catalysts. For all bimetallic catalysts, molybdenum seemed to segregate to the surface irrespective of the sequence of the impregnation. Strong interaction of Mo atoms with the support was also identified with EXAFS and XANES for both monometallic Mo catalysts and bimetallic catalysts. Regarding the activities of CO hydrogenation, it was concluded that reduced Mo sites were responsible for the high activity and that Pt helped Mo sites become more reduced. 28 refs., 6 figs., 5 tabs.

• OSTI ID: 563476
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 167; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
40 CHEMISTRY
ABSORPTION SPECTROSCOPY
ALUMINIUM OXIDES
CARBON MONOXIDE
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHEMISORPTION
HETEROGENEOUS CATALYSIS
HYDROGENATION
MOLYBDENUM
PLATINUM
SORPTIVE PROPERTIES
STRUCTURAL CHEMICAL ANALYSIS
X-RAY SPECTROSCOPY