Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>
Au, Pt, and Pt-Au catalysts supported on Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> were studied in the oxidation of dichloromethane (DCM, CH<sub>2</sub>Cl<sub>2</sub>). High DCM oxid...
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MDPI AG
2020-10-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/20/4644 |
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| author | Tuomas K. Nevanperä Satu Pitkäaho Satu Ojala Riitta L. Keiski |
| author_facet | Tuomas K. Nevanperä Satu Pitkäaho Satu Ojala Riitta L. Keiski |
| author_sort | Tuomas K. Nevanperä |
| collection | DOAJ |
| description | Au, Pt, and Pt-Au catalysts supported on Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> were studied in the oxidation of dichloromethane (DCM, CH<sub>2</sub>Cl<sub>2</sub>). 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<sub>2</sub>O<sub>3</sub>-supported and by 35 and 40 degrees with the CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al<sub>2</sub>O<sub>3</sub> and Pt-Au/Al<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al<sub>2</sub>O<sub>3</sub>-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO<sub>2</sub>. |
| first_indexed | 2024-03-10T15:41:11Z |
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| id | doaj.art-25fbd4865c284a628e612557138a798f |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T15:41:11Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-25fbd4865c284a628e612557138a798f2023-11-20T16:47:34ZengMDPI AGMolecules1420-30492020-10-012520464410.3390/molecules25204644Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>Tuomas K. Nevanperä0Satu Pitkäaho1Satu Ojala2Riitta L. Keiski3Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, FinlandFaculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, FinlandFaculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, FinlandFaculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, FinlandAu, Pt, and Pt-Au catalysts supported on Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> were studied in the oxidation of dichloromethane (DCM, CH<sub>2</sub>Cl<sub>2</sub>). 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<sub>2</sub>O<sub>3</sub>-supported and by 35 and 40 degrees with the CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al<sub>2</sub>O<sub>3</sub> and Pt-Au/Al<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al<sub>2</sub>O<sub>3</sub>-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO<sub>2</sub>.https://www.mdpi.com/1420-3049/25/20/4644environmental catalysisgoldplatinumbimetallic catalystchlorinated volatile organic compound (CVOC) |
| spellingShingle | Tuomas K. Nevanperä Satu Pitkäaho Satu Ojala Riitta L. Keiski Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Molecules environmental catalysis gold platinum bimetallic catalyst chlorinated volatile organic compound (CVOC) |
| title | Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> |
| title_full | Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> |
| title_fullStr | Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> |
| title_full_unstemmed | Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> |
| title_short | Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> |
| title_sort | oxidation of dichloromethane over au pt and pt au containing catalysts supported on γ al sub 2 sub o sub 3 sub and ceo sub 2 sub al sub 2 sub o sub 3 sub |
| topic | environmental catalysis gold platinum bimetallic catalyst chlorinated volatile organic compound (CVOC) |
| url | https://www.mdpi.com/1420-3049/25/20/4644 |
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