On the redispersion of supported metal catalysts

Conference · Mon Jan 01 04:00:00 EST 1979 · 72nd AIChE Annu. Meet. Prepr.; (United States)

OSTI ID:6187697

Handa, P K; Matthews, J C

The reversibility of sintering was tested with a catalyst containing 1.62% Pt on commercial alumina. The initial dispersion of the catalyst, as measured by hydrogen adsorption, was 102%. Treatment of a portion of this catalyst in hydrogen for two hours at 500/sup 0/C lowered the dispersion to 55%; three five-minute treatments in oxygen at 550/sup 0/C redispersed the catalyst to 79% dispersion, and further oxygen treatments lowered the dispersion again. A catalyst sintered at 500/sup 0/C under vacuum in several four-hour steps to 69% dispersion was further sintered to 51% dispersion by one one-hour and two five-minute treatments in oxygen; further hydrogen-treatment at 500/sup 0/C for one hour decreased the dispersion to 41%, but this last sintering step could be reversed in oxygen; further oxygen treatment gradually decreased the dispersion. A catalyst sample treated in oxygen in several steps at 450/sup 0/-625/sup 0/C for various lengths of time could not be redispersed. A review of literature on metal redispersion is enclosed.

• Research Organization: Kansas State Univ.
• OSTI ID: 6187697
• Report Number(s): CONF-791108-
• Conference Information: Journal Name: 72nd AIChE Annu. Meet. Prepr.; (United States) Journal Volume: P-5D
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
DATA
DISPERSIONS
DOCUMENT TYPES
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
HIGH TEMPERATURE
HYDROGEN
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REVIEWS
SINTERING
SYNTHESIS
TESTING
TIME DEPENDENCE
TRANSITION ELEMENTS