Study on the Reaction Mechanism for Soot Oxidation Over TiO2 or ZrO2-supported Vanadium Oxide Catalysts by Means of In-situ UV-Raman

• Published in: Catalysis letters Vol. 120; no. 1-2; pp. 148 - 153
• Main Authors: Liu, Jian, Zhao, Zhen, Liang, Peng, Xu, Chunming, Duan, Aijun, Jiang, Guiyuan, Lin, Wenyong, Wachs, Israel E.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.01.2008; Springer; Springer Nature B.V
• Subjects: Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Exact sciences and technology; Gas streams; General and physical chemistry; Industrial Chemistry/Chemical Engineering; Nitrogen dioxide; Organometallic Chemistry; Oxidation; Physical Chemistry; Raman spectroscopy; Reaction mechanisms; Soot; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium dioxide; Vanadium oxides; Zirconium dioxide; UV-Raman; Reaction mechanism; Supported vanadium oxide; In-situ; Soot; Catalyst; Heterogeneous catalysis; Supported vanadium oxide, Catalyst; Zirconium oxide; In situ; Transition element compounds; Vanadium oxide; Oxidation; UV-Raman, In-situ; Titanium oxide; Supported catalyst
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-007-9267-6

The reaction mechanisms for diesel soot oxidation over V 4 /ZrO 2 or V 4 /TiO 2 oxide catalysts were studied by the means of in-situ UV-Raman spectroscopy. The results indicate that the formation of surface oxygen complexes (SOC) is a key step and the SOC species mainly exist as carboxyl groups. The presence of NO in the reaction gas stream can promote the formation of SOC species. For soot oxidation over V 4 /TiO 2 catalyst, NO 2 can be produced and remarkably accelerate soot oxidation. Based on the UV-Raman experimental results, two different reaction mechanisms are proposed for soot oxidation over V 4 /ZrO 2 or V 4 /TiO 2 samples, respectively.