Hydrothermal stability of silica as a support for platinum in an oxidation catalyst

• Published in: Applied catalysis Vol. 44; no. 1-2; pp. 251 - 260
• Main Authors: Axelsson, I.M., Löwendahl, L., Otterstedt, J.E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1988; Elsevier
• Subjects: Catalysis; Catalysts: preparations and properties; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; General. Nomenclature, chemical documentation, computer chemistry; Theory of reactions, general kinetics; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Pore size; Stability; Hydrothermal treatment; Sodium; Platinum; Transition metal; Catalyst activity; Alumina; Silica; Supported catalyst
• ISSN: 0166-9834
• DOI: 10.1016/S0166-9834(00)80057-3

Silica and alumina were subjected to hydrothermal treatment at 750°C for up to 48 h. The sodium content of silica had a strong influence on the stability towards sintering. Silica, containing 0.05 wt.-% sodium, lost less of its original surface area than did alumina during the hydrothermal treatment. Light-off temperatures, and dependence of conversion of carbon monoxide to carbon dioxide over catalysts with platinum on wash-coats of alumina and silica on flow-rate, were determined before and after deactivation. Platinum on sodium-free silica had higher activity than platinum on alumina both before and after deactivation.