Role of acid and redox properties on propane oxidative dehydrogenation over polyoxometallates

Dimitratos, Nikolaos ORCID: https://orcid.org/0000-0002-6620-4335 and Vedrine, J. C. 2003. Role of acid and redox properties on propane oxidative dehydrogenation over polyoxometallates. Catalysis Today 81 (4) , pp. 561-571. 10.1016/S0920-5861(03)00154-8

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Abstract

Cs2.5H1.5PV1Mo11O40 heteropolyoxometallate compounds have been studied for propane oxidative dehydrogenation (ODH) in the 340–400 °C temperature range. Their redox and Brønsted acid properties have been tuned by introducing a redox metal element M such as CoII, FeIII, GaIII, NiII, SbIII or ZnII in a V:M atom ratio equal to 1:1. This introduction was carried out either directly in the synthesis solution or by usual aqueous cationic exchange of protons of the solid Cs salt. TGA and FT-IR analyses allowed us to determine the extent of metal M substitution for MoVI in the Keggin anion and proton replacement by the M cation. It was observed that, under catalytic conditions (C3:O2:He=2:1:2, flow rate 15 cm3 min−1, 12 h on stream), the catalysts were stable, with only a small part of the substituted elements (V and/or M) being extracted from the Keggin anion during the reaction. The presence of these metal M cations enabled us to tune the redox and acid properties of the material and to get high selectivity for propene (60–80% at 5 and 10% propane conversion) at a relatively low temperature (300–400 °C). The direct synthesis method was found more efficient than the classical cationic exchange technique for propane ODH.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Cardiff Catalysis Institute (CCI) Chemistry
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	Propane ODH; Acid/redox properties; Redox metals: Co, Ni, Fe, Ga, Sb, Zn; Keggin heteropoly compounds
Publisher:	Elsevier
ISSN:	0920-5861
Last Modified:	25 Oct 2022 08:28
URI:	https://orca.cardiff.ac.uk/id/eprint/53107

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