Influence of heat treatment of bimetallic catalysts on the metal surface of platinum, palladium, and rhenium deposited on aluminum oxide
Journal Article
·
· Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)
OSTI ID:6596482
The influence of heat treatment on recrystallization of Pt, Re, and Pd particles in bimetallic catalysts was investigated by means of a comprehensive procedure developed for determination of the surface areas of Pt and Re. The catalysts were prepared by impregnation. Re was introduced as a rhenic acid solution in the preparation of Re catalysts. Specimens of the reduced catalysts (each 2 g) were placed in porcelain crucibles and calcined for 6 h in a muffle furnace, first at 580/sup 0/C, then for 6 h at 640/sup 0/C after determination of the adsorption characteristics. The specific surface of the metal was determined by a modification of the method of gaseous titration with ethylene and chemisorption of 0/sub 2/. It was determined that the aluminum-palladium-rhenium catalyst has less developed metal surface (52 m/sup 2//g metal) than the aluminum-palladium catalyst. Heat treatment of the aluminum-palladium-rhenium catalyst increases the overall specific surface of Pd and Re. And, rhenium does not inhibit recrystallization of platinum and palladium in air, but promotes high thermal stability of the catalyst.
- Research Organization:
- Academy of Sciences of USSR, Kazan
- OSTI ID:
- 6596482
- Journal Information:
- Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States), Journal Name: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Vol. 30:9; ISSN BACCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYSTS
CHALCOGENIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
HEAT TREATMENTS
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
RECRYSTALLIZATION
RHENIUM
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENTS
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYSTS
CHALCOGENIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
HEAT TREATMENTS
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
RECRYSTALLIZATION
RHENIUM
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENTS