In situ Raman study on the partial oxidation of methane to synthesis gas over Rh/Al2O3 and Ru/Al2O3 catalysts

Autor:	Chuanjing Huang, Huilin Wan, Ying Liu, Mei-Liu Wang, Weizheng Weng, Fei-Yang Huang, Wen-Sheng Xia, Jian-Mei Li, Chun-Rong Luo
Rok vydání:	2008
Předmět:	Reaction mechanism Inorganic chemistry chemistry.chemical_element Heterogeneous catalysis Photochemistry Catalysis Rhodium symbols.namesake chemistry Oxidation state symbols Partial oxidation Physical and Theoretical Chemistry Raman spectroscopy Syngas
Zdroj:	Journal of Catalysis. 256:192-203
ISSN:	0021-9517
Popis:	In situ microprobe Raman and XRD techniques were used to follow the oxidation state of Rh/Al 2 O 3 and Ru/Al 2 O 3 catalysts during the catalytic ignition process of the partial oxidation of methane (POM) to synthesis gas. It was found that the catalyst was in the fully oxidized state before ignition of the POM reaction, and abruptly changed its oxidation state at the temperature at which the POM reaction started. After the POM reaction was ignited, the amount of Rh 2 O 3 or RuO 2 in the catalyst at the entrance of the catalyst bed was below the detection level of Raman spectroscopy. Due to the greater M O bond strength of Ru O compared with Rh O, Ru/Al 2 O 3 demonstrated a greater tendency to oxidize than Rh/Al 2 O 3 under the POM conditions. This factor affects the oxygen coverage on the two catalysts under reaction conditions and consequently affects the pathways of synthesis gas formation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::835dc4fb95781eb62fa3f7985f4e89a4 https://doi.org/10.1016/j.jcat.2008.03.009 Zobrazit plný text záznamu Full Text from ScienceDirect