Enhancement effect of water on oxidation reactions over commercial three-way catalyst

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 141; no. 1; pp. 194 - 203
• Main Authors: Kwon, Hyuk Jae, Baik, Joon Hyun, Kwon, Yong Tak, Nam, In-Sik, Oh, Se H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2008; Elsevier
• Subjects: Adsorption; Applied sciences; Catalysis; Catalytic reactions; Chemical engineering; Chemistry; Enhancement effect of water; Exact sciences and technology; FTIR; General and physical chemistry; Oxidation reaction; Reaction kinetics; Reactors; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TPD; TWC; TWC; TPD; Enhancement effect of water; Oxidation reaction; FTIR; Reaction kinetics; Desorption; Modeling; Kinetic model; Adsorption; Three way catalyst; Oxidation; Kinetics; Strength
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2007.12.017

The light-off temperature of the oxidations of CO and C 3H 6 over a commercial three-way catalyst (TWC) was shifted to a lower temperature by the addition of water to the feed stream. From FTIR analysis, the formation of carboxylate and carbonate by a reaction between adsorbed CO and OH on the catalyst surface was observed during the course of the reactions. In addition, the CO desorption peak of CO-TPD shifted to a lower temperature by water, which may be directly indicative of the reduction of the adsorption strength of CO on the catalyst surface. Detailed reaction kinetic models have been developed in view of the concept of microkinetics to describe the effect of water, particularly on the oxidation activity over a commercial TWC.