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Metal oxide catalysts for the low temperature selective oxidation of propane to iso-propanol

Davies, Thomas Edward. 2006. Metal oxide catalysts for the low temperature selective oxidation of propane to iso-propanol. PhD Thesis, Cardiff University.

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Abstract

A range of Ga203/Mo03 and C03O4 catalysts have been prepared and tested for the oxidative dehydrogenation of propane to propene. The Ga2(VMo03 physical mixture demonstrated appreciable activity for propane conversion, with selectivity to propene comparable to existing known catalysts. The major products were propene and carbon dioxide with trace amounts of acrolein in some cases. The bulk C03O4 catalyst was active for the conversion of propane at temperatures as low as ambient. The conversion at such low temperatures was very low but the selectivity to propene was near 100%. At temperatures lower than 100 °C the catalyst showed rapid deactivation but at temperatures nearing 140 °C the catalyst was capable of steady state conversion. Further study led to the creation of a high surface area nano-crystalline C03O4 catalyst that was more active and selective than the original C03O4 sample. The catalyst activity was probed by varying the reaction conditions and it was demonstrated that the selectivity and activity could be improved by varying the flow rate, feed composition and catalyst preparation method. Further studies looked into combining the low temperature C03O4 catalyst with an acid hydration catalyst for the one step selective oxidation of propane to iso-propanol. The nano-crystalline sample was tested alongside various heteropolyacids and supported phosphoric acid catalyst. Co-feeding water had a negative effect on the activity of the nano-crystalline C03O4 catalyst but trace amounts of iso-propanol were found in the reaction product indicating that the process investigated was possible.

Item Type: Thesis (PhD)
Status: Unpublished
Schools: Chemistry
Subjects: Q Science > QD Chemistry
ISBN: 9781303208799
Date of First Compliant Deposit: 30 March 2016
Last Modified: 12 Feb 2016 23:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/56195

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