Understanding the Synthesis of Supported Vanadium Oxide Catalysts Using Chemical Grafting
| Autor: | Ive Hermans, Michael P. Hanrahan, Scott L. Carnahan, Alyssa M. Love, Melissa C. Cendejas, Pajean Uchupalanun, Aaron J. Rossini |
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| Rok vydání: | 2019 |
| Předmět: |
010405 organic chemistry
Organic Chemistry Oxide Vanadium chemistry.chemical_element General Chemistry 010402 general chemistry 01 natural sciences Chemical reaction Catalysis Vanadium oxide 0104 chemical sciences Silanol chemistry.chemical_compound chemistry Chemical engineering Reactivity (chemistry) Incipient wetness impregnation |
| Zdroj: | Chemistry – A European Journal. 26:1052-1063 |
| ISSN: | 1521-3765 0947-6539 |
| DOI: | 10.1002/chem.201904260 |
| Popis: | The complexity of variables during incipient wetness impregnation synthesis of supported metal oxides precludes an in-depth understanding of the chemical reactions governing the formation of the dispersed oxide sites. This contribution describes the use of vapor phase deposition chemistry (also known as grafting) as a tool to systematically investigate the influence of isopropanol solvent on VO(Oi Pr)3 anchoring during synthesis of vanadium oxide on silica. The availability of anchoring sites on silica was found to depend not only on the pretreatment of the silica but also on the solvent present. H-bond donors can reduce the reactivity of isolated silanols whereas disruption of silanol nests by H-bond acceptors can turn unreactive H-bonded silanols into reactive anchoring sites. The model suggested here can inform improved syntheses with increased dispersion of metal oxides on silica. |
| Databáze: | OpenAIRE |
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