Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid
The single-pot efficient oxidation of ethane to acetic acid catalysed by Au(I) or Au(III) compounds, chlorotriphenylphosphinegold(I) (<b>1</b>), chlorotrimethylphosphinegold(I) (<b>2</b>), 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidenegold(I) chloride (<b>3</b>)...
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MDPI AG
2022-01-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/2/165 |
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| author | Ana P. C. Ribeiro Inês A. S. Matias Sónia A. C. Carabineiro Luísa M. D. R. S. Martins |
| author_facet | Ana P. C. Ribeiro Inês A. S. Matias Sónia A. C. Carabineiro Luísa M. D. R. S. Martins |
| author_sort | Ana P. C. Ribeiro |
| collection | DOAJ |
| description | The single-pot efficient oxidation of ethane to acetic acid catalysed by Au(I) or Au(III) compounds, chlorotriphenylphosphinegold(I) (<b>1</b>), chlorotrimethylphosphinegold(I) (<b>2</b>), 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidenegold(I) chloride (<b>3</b>), dichloro(2-pyridinecarboxylato)gold(III) (<b>4</b>), homogenous and supported on different carbon materials: activated carbon (AC), multi-walled carbon nanotubes (CNT) and carbon xerogel (CX), oxidised with nitric acid followed by treatment with NaOH (-ox-Na), is reported. The reactions were performed in water/acetonitrile. The materials were selective for the production of acetic acid, with no trace of by-products being detected. The best homogenous catalysts were complexes <b>2</b> and <b>3</b> which showed the highest ethane conversion and an acetic acid yield of ca. 21%, followed by <b>4</b> and <b>1</b>. The heterogenised materials showed much better activity than the homogenous counterparts, with acetic acid yields up to 41.4% for <b>4</b>@CNT-ox-Na, and remarkable selectivity (with acetic acid being the only product detected). The heterogenised catalysts with the best results were reused up to five cycles, with no significant loss of activity, and maintaining high selectivity for acetic acid. <b>4</b>@CNT-ox-Na showed not only the best catalytic activity but also the best stability during the recycling runs. |
| first_indexed | 2024-03-09T22:22:02Z |
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| last_indexed | 2024-03-09T22:22:02Z |
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| series | Catalysts |
| spelling | doaj.art-4bafec3a2def43529f69fddee4edca222023-11-23T19:12:18ZengMDPI AGCatalysts2073-43442022-01-0112216510.3390/catal12020165Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic AcidAna P. C. Ribeiro0Inês A. S. Matias1Sónia A. C. Carabineiro2Luísa M. D. R. S. Martins3Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, PortugalThe single-pot efficient oxidation of ethane to acetic acid catalysed by Au(I) or Au(III) compounds, chlorotriphenylphosphinegold(I) (<b>1</b>), chlorotrimethylphosphinegold(I) (<b>2</b>), 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidenegold(I) chloride (<b>3</b>), dichloro(2-pyridinecarboxylato)gold(III) (<b>4</b>), homogenous and supported on different carbon materials: activated carbon (AC), multi-walled carbon nanotubes (CNT) and carbon xerogel (CX), oxidised with nitric acid followed by treatment with NaOH (-ox-Na), is reported. The reactions were performed in water/acetonitrile. The materials were selective for the production of acetic acid, with no trace of by-products being detected. The best homogenous catalysts were complexes <b>2</b> and <b>3</b> which showed the highest ethane conversion and an acetic acid yield of ca. 21%, followed by <b>4</b> and <b>1</b>. The heterogenised materials showed much better activity than the homogenous counterparts, with acetic acid yields up to 41.4% for <b>4</b>@CNT-ox-Na, and remarkable selectivity (with acetic acid being the only product detected). The heterogenised catalysts with the best results were reused up to five cycles, with no significant loss of activity, and maintaining high selectivity for acetic acid. <b>4</b>@CNT-ox-Na showed not only the best catalytic activity but also the best stability during the recycling runs.https://www.mdpi.com/2073-4344/12/2/165ethane oxidationacetic acidgoldcarbonheterogeneous catalysis |
| spellingShingle | Ana P. C. Ribeiro Inês A. S. Matias Sónia A. C. Carabineiro Luísa M. D. R. S. Martins Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid Catalysts ethane oxidation acetic acid gold carbon heterogeneous catalysis |
| title | Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid |
| title_full | Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid |
| title_fullStr | Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid |
| title_full_unstemmed | Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid |
| title_short | Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid |
| title_sort | commercial gold complexes supported on functionalised carbon materials as efficient catalysts for the direct oxidation of ethane to acetic acid |
| topic | ethane oxidation acetic acid gold carbon heterogeneous catalysis |
| url | https://www.mdpi.com/2073-4344/12/2/165 |
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