University of Oulu

Nevanperä, T.K.; Pitkäaho, S.; Ojala, S.; Keiski, R.L. Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al2O3 and CeO2-Al2O3. Molecules 2020, 25, 4644. https://doi.org/10.3390/molecules25204644

Oxidation of dichloromethane over Au, Pt, and Pt-Au containing catalysts supported on γ-Al₂O₃ and CeO₂-Al₂O₃

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Author: Nevanperä, Tuomas K.1; Pitkäaho, Satu1; Ojala, Satu1;
Organizations: 1Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 8.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020111991964
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2020
Publish Date: 2020-11-19
Description:

Abstract

Au, Pt, and Pt-Au catalysts supported on Al₂O₃ and CeO₂-Al₂O₃ were studied in the oxidation of dichloromethane (DCM, CH₂Cl₂). 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 Al₂O₃-supported and by 35 and 40 degrees with the CeO₂-Al₂O₃-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al₂O₃ and Pt-Au/Al₂O₃ 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/Al₂O₃ catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al₂O₃-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO₂.

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Series: Molecules
ISSN: 1420-3049
ISSN-E: 1420-3049
ISSN-L: 1420-3049
Volume: 25
Issue: 20
Article number: 4644
DOI: 10.3390/molecules25204644
OADOI: https://oadoi.org/10.3390/molecules25204644
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Subjects:
Funding: The work was done with the funding of the Council of Oulu Region from the European Regional Development Fund (A32164), the City of Oulu, and Maj and Tor Nessling Foundation. The Finnish Foundation for Technology Promotion, KAUTE Foundation, Walter Ahlström Foundation, Tauno Tönning Foundation, and the University of Oulu Graduate School are acknowledged for their financial support for the research reported in this paper. The research gained funding also from the European Union Seventh Framework Programme (FP7/2007-2013) under the grant agreement n0 (PIRSES-GA-2012-317714).
Copyright information: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/