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Green preparation of transition metal oxide catalysts using supercritical CO2 anti-solvent precipitation for the total oxidation of propane

Marin, Raimon P., Kondrat, Simon A., Pinnell, Rebecca K., Davies, Thomas Edward, Golunski, Stanislaw E., Bartley, Jonathan Keith, Hutchings, Graham John and Taylor, Stuart Hamilton 2013. Green preparation of transition metal oxide catalysts using supercritical CO2 anti-solvent precipitation for the total oxidation of propane. Applied Catalysis B: Environmental 140 , pp. 671-679. 10.1016/j.apcatb.2013.04.076

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Abstract

A series of metal oxide catalysts, including Fe3O4, NiO, CuO and Co3O4, have been prepared by supercritical anti-solvent precipitation and evaluated for the total oxidation of propane. Co3O4 was found to be the most active catalyst and our studies have focussed on this oxide. The addition of water as co-solvent in the supercritical anti-solvent preparation was investigated. Powder X-ray diffraction and infrared spectroscopy indicated that the addition of water promoted the formation of carbonate species in the catalyst precursors. The formation of the catalysts from the precursor were optimised by investigating the thermal treatment conditions, by studying variables including time, temperature and atmosphere. The optimal conditions for catalyst preparation required precursor precipitation containing 10 vol% water co-solvent followed by a 2 h calcination at 250 °C. These conditions produced Co3O4 with high surface areas (>100 m2 g−1), which were very active catalysts producing 50% propane conversion at 175 °C.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Propane; Total oxidation; Supercritical anti-solvent precipitation; Metal acetates; Metal oxides; Cobalt oxide
Publisher: Elsevier
ISSN: 0926-3373
Last Modified: 12 Jun 2019 02:32
URI: http://orca.cf.ac.uk/id/eprint/47255

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