Structure characterization of platinum/alumina, rhenium/alumina, and platinum-rhenium/alumina catalysts

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1015· OSTI ID:7107608

Laiyuan, Chen; Yueqin, Ni; Jingling, Zang; Liwu, Lin; Xhiui, Luo ^[1]; Sen, Cheng ^[2]

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1. Dalian Institute of Chemical Physics, Dalian (China)
2. Funshun Institute of Petroleum Chemical Engineering, Liaoning (China)

The structures of Pt, Re, and Pt-Re catalysts supported on alumina containing 0.14 wt% titania were studied in the stages of impregnation, calcination, and reduction by UV diffuse reflectance spectroscopy (DRS), temperature-programmed reduction (TPR), selected area electron diffraction (SAED), and carbon monoxide and hydrogen adsorption measurements. Both platinum and rhenium species interacted strongly with the support after calcination. It is suggested that the platinum species interacts more strongly with titania than with alumina, while the converse is true with the rhenium species. A Pt[sub 3]Ti alloy was found in both the reduced Pt/Al[sub 2]O[sub 3] and reduced Pt-Re/Al[sub 2]O[sub 3] catalysts. An Al(ReO[sub 4])[sub 3] complex was found in the Re/Al[sub 2]O[sub 3] catalyst which was reduced at 480[degrees]C. Pt(O), Re(O), and Pt[sub 3]Ti coexist in the reduced Pt-Re/Al[sub 2]O[sub 3] catalyst and the surface concentration of Re(O) increases with the Re/Pt ratio. Hydrogen adsorption at a high temperature increases with increasing Re/Pt ratio. It is possible that this kind of hydrogen is responsible for the higher stability of the catalyst with a high Re/Pt ratio. 28 refs., 9 figs., 3 tabs.

• OSTI ID: 7107608
• Journal Information: Journal of Catalysis; (United States), Vol. 145:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
STRUCTURAL CHEMICAL ANALYSIS
PLATINUM COMPOUNDS
RHENIUM COMPOUNDS
CATALYST SUPPORTS
SORPTIVE PROPERTIES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties