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

Dimitratos, Nikolaos 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: 04 Jun 2017 05:44
URI: http://orca.cf.ac.uk/id/eprint/53107

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