|
|||||
|
|
Understanding the Synthesis of Supported Vanadium Oxide Catalysts Using Chemical Grafting |
|
| Authors: | Dr Alyssa M Love Melissa C Cendejas Michael P Hanrahan Scott L Carnahan Pajean Uchupalanun Prof?Dr Aaron J Rossini Prof?Dr Ive Hermans |
| Institution: | 1. Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI, 53706 USA
These authors contributed equally to this work.;2. Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011 USA;3. Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI, 53706 USA;4. Department of Chemical and Biological Engineering, University of Wisconsin–Madison, 1415 Engineering Drive, Madison, WI, 53706 USA |
| Abstract: | 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(OiPr)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. |
| Keywords: | heterogeneous catalysis oxidative dehydrogenation solid state NMR spectroscopy supported catalysts vanadium |