The sintering of supported metal catalysts-2. Comparison of sintering rates of supported Pt, Ir, Rh catalysts in hydrogen and oxygen

Journal Article · Wed Feb 01 00:00:00 EST 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90293-2· OSTI ID:5864481

Fiedorow, R M.J.; Chahar, B S; Wanke, S E

Ten alumina-supported catalysts containing 0.5 or 2% Pt, 2% Ir, 0.5 or 1% Rh, or 0.5 or 1% Ru were treated at 500/sup 0/-800/sup 0/C for up to 16 hr in oxygen and hydrogen, and the relative stability towards sintering was determined by hydrogen adsorption before and after thermal treatment. The results showed that the stability decreased in the order Rh > Pt > Ir > Ru in oxygen, and Ir > Ru > Rh > Pt in hydrogen, in agreement with predictions based on molecular transport of metal oxides in oxygen and heats of sublimation (i.e., also molecular migration) in hydrogen. Graphs, tables, and 16 references.

• Research Organization: Univ. of Alberta, Edmonton, Canada
• OSTI ID: 5864481
• Journal Information: J. Catal.; (United States), Vol. 51:2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IRIDIUM
SINTERING
PLATINUM
RHODIUM
ADSORPTION
ALUMINIUM OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
HIGH TEMPERATURE
HYDROGEN
KINETICS
METALS
OXYGEN
PHYSICAL PROPERTIES
STABILITY
THERMODYNAMIC PROPERTIES
VERY HIGH TEMPERATURE
ALUMINIUM COMPOUNDS
CHALCOGENIDES
ELEMENTS
FABRICATION
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SORPTION
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties