effect of oxygen adsorption on catalytic activity of SnO₂ in CO oxidation

• Published in: Catalysis today Vol. 169; no. 1; pp. 192 - 199
• Main Authors: Kocemba, Ireneusz, Rynkowski, Jacek M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2011; Elsevier
• Subjects: adsorption; Catalysis; catalytic activity; Chemistry; Exact sciences and technology; General and physical chemistry; heat treatment; oxidation; oxygen; pretreatment; Surface physical chemistry; temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; tin; Scanning electron microscopy; Binary compound; Oxygen; Catalytic reaction; Heat treatment; Carbon monoxide oxidation; TPR-CO; Oxygen TPD; Mechanism; Heterogeneous catalysis; Tin dioxide; Adsorption; Tin oxide; Oxidation; Carbon monoxide
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2010.09.015

A sequence of thermal treatments in oxygen was undertaken to study the influences of oxygen adsorption on the catalytic activity of SnO₂ in CO oxidation. Commercial SnO₂ (Fluka) and tin dioxide obtained from SnCl₄ were characterized using XTD, BET, SEM TPD, and TPR methods. Catalytic activity of SnO₂ samples was carried out as a function of pre-treatment temperature in oxygen. Due to the presence of different reactive oxygen forms, CO oxidation shows the hysteretic course. The approach to the differentiated mechanism of CO oxidation over SnO₂ has been presented. The results obtained should be useful in understanding how the oxygen adsorption affects the catalytic activity of tin dioxide towards CO oxidation.