Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals

Autor:	Shin Ichi Ito, Yoichi Ishida, Hisanori Tanaka, Masatoshi Kuriyama, Kimio Kunimori, Keiichi Tomishige
Rok vydání:	2008
Předmět:	Hydrogen Process Chemistry and Technology Potassium Inorganic chemistry PROX food and beverages chemistry.chemical_element Alkali metal Heterogeneous catalysis Catalysis Transition metal chemistry Platinum
Zdroj:	Applied Catalysis A: General. 343:117-124
ISSN:	0926-860X
Popis:	In preferential CO oxidation in H2-rich stream (PROX), the additive effect of potassium on Pt catalysts was more remarkable over Al2O3 than over SiO2, ZrO2, Nb2O5 and TiO2. The additive effect of potassium to Pt/Al2O3 was more effective than other alkali metals. Especially, the presence of H2 drastically promoted CO oxidation over Pt/Al2O3 modified with potassium. On the other hand, the suppressing effect of steam on the PROX was more significant over K-Pt/Al2O3 than over Pt/Al2O3, although the PROX activity of K-Pt/Al2O3 was much higher than that of Pt/Al2O3 even under the presence of steam. The different effect of steam addition to the PROX over K-Pt/Al2O3 suggests that the active site can be Pt surface modified with potassium ions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e4dc955ca7ef9ee1ff43d4a9f09e2285 https://doi.org/10.1016/j.apcata.2008.03.030 Zobrazit plný text záznamu Full Text from ScienceDirect