Effects of Brønsted acidity in the mechanism of selective oxidation of propane to acetone on CaY zeolite at room temperature

Autor:	J. Xu, Leon Lefferts, Jan G. van Ommen, Barbara L. Mojet
Přispěvatelé:	Catalytic Processes and Materials, Faculty of Science and Technology
Rok vydání:	2005
Předmět:	chemistry.chemical_classification Ketone Inorganic chemistry Catalysis IR-54138 chemistry.chemical_compound chemistry Propane Acetone Partial oxidation Physical and Theoretical Chemistry Brønsted–Lowry acid–base theory Zeolite Selectivity METIS-227828
Zdroj:	Journal of catalysis, 232(2), 411-423. Academic Press Inc.
ISSN:	0021-9517
DOI:	10.1016/j.jcat.2005.04.004
Popis:	The importance of Brønsted acid sites for partial oxidation of propane to acetone in CaY was investigated by in situ FTIR spectroscopy. With an increasing number of protons in Ca-Y, Volcano plots were observed for (1) amount of adsorbed propane; (2) initial acetone formation rate; (3) total amount of acetone after 20 h of reaction; (4) acetone selectivity. The results clearly show that Brønsted acidity increases the isopropylhydroperoxide (IHP) formation rate, most likely via a catalytic H+ transfer, and IHP decomposition into acetone and water. Moreover, with increasing IHP concentration 2-propanol was found in addition to acetone. Since an increasing number of Brønsted acid sites implies a decreasing number of Ca2+ in the zeolite, an optimal H+/Ca2+ ratio was observed for both activity and selectivity for acetone
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93eb067d7deaf27fe2a1c561eb59165f https://doi.org/10.1016/j.jcat.2005.04.004 Zobrazit plný text záznamu Full Text from ScienceDirect