Influence of heat treatment of bimetallic catalysts on the metal surface of platinum, palladium, and rhenium deposited on aluminum oxide
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), Vol. 30:9; Other Information: Translated from Izv. Akad. Nauk SSSR; 30: No. 9(Sep 1981)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CATALYSTS
HEAT TREATMENTS
PALLADIUM
RECRYSTALLIZATION
PLATINUM
RHENIUM
ALUMINIUM OXIDES
BIMETALS
EXPERIMENTAL DATA
SURFACE AREA
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DATA
ELEMENTS
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SURFACE PROPERTIES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
360102 - Metals & Alloys- Structure & Phase Studies