Adipic acid formation from cyclohexanediol using platinum and vanadium catalysts: elucidating the role of homogeneous vanadium species
| Autor: | Robert Leyshon Jenkins, Rebecca V. Engel, Owen Rogers, Keith Whiston, Stuart Hamilton Taylor, Graham J. Hutchings, Samuel Pattisson |
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| Rok vydání: | 2020 |
| Předmět: |
Adipic acid
Aqueous solution Inorganic chemistry chemistry.chemical_element Vanadium 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Copper Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Oxidation state Leaching (metallurgy) 0210 nano-technology Platinum |
| Zdroj: | Catalysis Science & Technology. 10:4210-4218 |
| ISSN: | 2044-4761 2044-4753 |
| DOI: | 10.1039/d0cy00914h |
| Popis: | Vanadium compounds have shown great potential alongside Pt/C for the oxidation of cyclohexanediol to adipic acid. However, the low stability of these materials often leads to ambiguity when considering the homogeneous or heterogeneous nature of the active species. In this article we describe our attempts to synthesise stable vanadium catalysts through the utilisation of vanadium bronze structures. By the addition of sodium, copper or silver into these structures, leaching could be decreased to 5% for AgVO3, compared to 88.4% with V2O5. These reactions were run in aqueous conditions under 3 bar O2. However, despite significant stabilisation of vanadium in the bronze structures, we show that as little as 7.6 ppm of a homogeneous vanadium species in the reaction solution can cause the selective oxidation of 2-hydroxycyclohexanone to adipic acid. Analysis of the speciation by 51V NMR and UV-vis has revealed the active species to be in the +5 oxidation state in the form of a decavanadate compound with the presence of small amounts of monovanadate. |
| Databáze: | OpenAIRE |
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