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

J. Xu, Barbara Mojet, J.G. van Ommen, Leonardus Lefferts

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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
Original languageUndefined
Pages (from-to)411-423
Number of pages13
JournalJournal of catalysis
Issue number2
Publication statusPublished - 2005


  • IR-54138
  • METIS-227828

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