Selective oxidation and oxidative dehydrogenation of hydrocarbons on bismuth vanadium molybdenum oxide
Journal Article
·
· Journal of Catalysis
- The Univ. of California, Berkeley, CA (United States)
A systematic investigation of the oxidative dehydrogenation of propane to propene and 1- and 2-butene to 1,3-butadiene, and the selective oxidation of isobutene to methacrolein was carried out over Bi1-x/3V1-xMoxO4 (x = 0-1) with the aim of defining the effects of catalyst and reactant composition on the reaction kinetics. This work has revealed that the reaction kinetics can differ significantly depending on the state of catalyst oxidation, which in turn depends on the catalyst composition and the reaction conditions. Under conditions where the catalyst is fully oxidized, the kinetics for the oxidation of propene to acrolein and isobutene to methacrolein, and the oxidative dehydrogenation of propane to propene, 1-butene and trans-2-butene to butadiene are very similar - first order in the partial pressure of the alkane or alkene and zero order in the partial pressure of oxygen. These observations, together with XANES and UV-Vis data, suggest that all these reactions proceed via a Mars van Krevelen mechanism involving oxygen atoms in the catalysts and that the rate-limiting step involves cleavage of the weakest C-H bond in the reactant. Consistent with these findings, the apparent activation energy and pre-exponential factor for both oxidative dehydrogenation and selective oxidation correlate with the dissociation energy of the weakest C-H bond in the reactant. As the reaction temperature is lowered, catalyst reoxidation can become rate-limiting, the transition to this regime depending on ease of catalyst reduction and effectiveness of the reacting hydrocarbons as a reducing agent. Here, a third regime is observed for isobutene oxidation at lower temperatures, in which the catalyst is more severely reduced and oxidation now proceeds via reaction of molecular oxygen, rather than catalyst lattice oxygen, with the reactant.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1571042
- Alternate ID(s):
- OSTI ID: 1244571
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 325; ISSN 0021-9517
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structural, surface, and catalytic properties of bismuth molybdovanadates containing foreign atoms. V. Oxidative dehydrogenation of 1-butene on iron-containing bismuth molybdovanadate catalysts
Kinetic isotopic effects in oxidative dehydrogenation of propane on vanadium oxide catalysts
MFI-type ferrisilicate catalysts for the oxidative dehydrogenation of alkanes
Journal Article
·
Mon Feb 28 23:00:00 EST 1994
· Journal of Catalysis; (United States)
·
OSTI ID:7034921
Kinetic isotopic effects in oxidative dehydrogenation of propane on vanadium oxide catalysts
Journal Article
·
Mon May 15 00:00:00 EDT 2000
· Journal of Catalysis
·
OSTI ID:20076103
MFI-type ferrisilicate catalysts for the oxidative dehydrogenation of alkanes
Journal Article
·
Wed Nov 30 23:00:00 EST 1994
· Journal of Catalysis
·
OSTI ID:47987