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Molecules

Title:		"Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on gamma-Al(2)O(3) and CeO(2)-Al(2)O(3)"
Author(s):		Nevanpera TK; Pitkaaho S; Ojala S; Keiski RL;
Address:		"Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland"
Journal Title:		Molecules
Year:		2020
Volume:		20201012
Issue:		20
Page Number:		-
DOI:		10.3390/molecules25204644
ISSN/ISBN:		1420-3049 (Electronic) 1420-3049 (Linking)
Abstract:		"Au, Pt, and Pt-Au catalysts supported on Al(2)O(3) and CeO(2)-Al(2)O(3) were studied in the oxidation of dichloromethane (DCM, CH(2)Cl(2)). High DCM oxidation activities and HCl selectivities were seen with all the catalysts. With the addition of Au, remarkably lower light-off temperatures were observed as they were reduced by 70 and 85 degrees with the Al(2)O(3)-supported and by 35 and 40 degrees with the CeO(2)-Al(2)O(3)-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al(2)O(3) and Pt-Au/Al(2)O(3) catalysts. The addition of ceria on alumina decreased the total acidity of these catalysts, resulting in lower performance. The 100-h stability test showed that the Pt-Au/Al(2)O(3) catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al(2)O(3)-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO(2)"
Keywords:		Aluminum Oxide/*chemistry Catalysis Gold/*chemistry Platinum/*chemistry Volatile Organic Compounds/*chemistry bimetallic catalyst chlorinated volatile organic compound (CVOC) environmental catalysis gold platinum;
Notes:		"MedlineNevanpera, Tuomas K Pitkaaho, Satu Ojala, Satu Keiski, Riitta L eng -/KAUTE-Saatio/ -/Tauno Tonningin Saatio/ -/Tekniikan Edistamissaatio/ 2014459/Maj ja Tor Nesslingin Saatio/ -/Walter Ahlstromin Saatio/ A32164/European Regional Development Fund/ PIRSES-GA-2012-317714/Seventh Framework Programme/ Switzerland 2020/10/16 Molecules. 2020 Oct 12; 25(20):4644. doi: 10.3390/molecules25204644"