The effect of metal ratio and precipitation agent on highly active iron-manganese mixed metal oxide catalysts for propane total oxidation

Shah, Parag M., Bailey, Liam A., Morgan, David J. ORCID: https://orcid.org/0000-0002-6571-5731 and Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874 2023. The effect of metal ratio and precipitation agent on highly active iron-manganese mixed metal oxide catalysts for propane total oxidation. Catalysts 13 (5) , 794. 10.3390/catal13050794

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Abstract

Iron-manganese mixed metal oxide catalysts with a range of Fe:Mn ratios were synthesised by co-precipitation using sodium carbonate and evaluated for total propane oxidation. The Fe0.50Mn0.50Ox catalyst was the most active, and this was due to increased surface area along with the formation of a Mn2O3 phase that was not present in the other catalysts. The effect of the precipitating agent was evaluated with the Fe0.50Mn0.50Ox catalyst, investigating preparation using (NH4)2CO3, K2CO3, NH4OH, KOH, and NaOH. In almost all cases, the activity of propane oxidation was increased compared to the Na2CO3-prepared catalyst, with the hydroxide-precipitated catalysts generally being more active than the carbonates. The NH4OH catalyst was the best performing and this was thought to be due to the formation of a highly active mixed defect spinel structure. Results demonstrate that highly active mixed metal oxide total oxidation catalysts can be prepared using abundant elements, and the choice of precipitating agent is important to maximise the activity.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Type: open-access
Publisher:	MDPI
ISSN:	2073-4344
Date of First Compliant Deposit:	9 May 2023
Date of Acceptance:	20 April 2023
Last Modified:	10 May 2023 13:33
URI:	https://orca.cardiff.ac.uk/id/eprint/159324

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