Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2
- Author
- Pascal Van Der Voort (UGent) , M Baltes and EF Vansant
- Organization
- Abstract
- The use of dimethyldichlorosilane as a coupling agent for the grafting of VOx structures on the MCM-48 surface produces a material that is simultaneously hydrophobic (immiscible with water) and very active (all V centers are accessible, even for water molecules). The VOx surface species are grafted by the molecular designed dispersion of VO(acac)(2) on the silylated surface, followed by a calcination in air at 450 degrees C. These hydrophobic MCM-48 supported VOx catalysts are thermally stable up to 500 degrees C. The grafted VOx surface species are very resistant toward leaching-out in aqueous media. Also, the structural and hydrothermal stability has improved enormously. The crystallinity of the materials does not decrease when the samples are subjected to a hydrothermal treatment at 150 degrees C and 4.7 atm pressure. A reaction mechanism is proposed and consolidated by FT-IR, Raman spectroscopy, and UV-vis diffuse reflectance. Pore size distributions, water adsorption isotherms, and X-ray diffractograms confirm the structural stability of these materials.
- Keywords
- ADSORPTION, VANADIUM-OXIDE CATALYSTS, SURFACE, MCM-41, ACETYLACETONATE, SILICAS, SIEVES
Downloads
-
(...).pdf
- full text
- |
- UGent only
- |
- |
- 600.64 KB
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8054330
- MLA
- Van Der Voort, Pascal, et al. “Synthesis of Stable, Hydrophobic MCM-48/VOx Catalysts Using Alkylchlorosilanes as Coupling Agents for the Molecular Designed Dispersion of VO(Acac)2.” JOURNAL OF PHYSICAL CHEMISTRY B, vol. 103, no. 46, 1999, pp. 10102–08, doi:10.1021/jp992146u.
- APA
- Van Der Voort, P., Baltes, M., & Vansant, E. (1999). Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2. JOURNAL OF PHYSICAL CHEMISTRY B, 103(46), 10102–10108. https://doi.org/10.1021/jp992146u
- Chicago author-date
- Van Der Voort, Pascal, M Baltes, and EF Vansant. 1999. “Synthesis of Stable, Hydrophobic MCM-48/VOx Catalysts Using Alkylchlorosilanes as Coupling Agents for the Molecular Designed Dispersion of VO(Acac)2.” JOURNAL OF PHYSICAL CHEMISTRY B 103 (46): 10102–8. https://doi.org/10.1021/jp992146u.
- Chicago author-date (all authors)
- Van Der Voort, Pascal, M Baltes, and EF Vansant. 1999. “Synthesis of Stable, Hydrophobic MCM-48/VOx Catalysts Using Alkylchlorosilanes as Coupling Agents for the Molecular Designed Dispersion of VO(Acac)2.” JOURNAL OF PHYSICAL CHEMISTRY B 103 (46): 10102–10108. doi:10.1021/jp992146u.
- Vancouver
- 1.Van Der Voort P, Baltes M, Vansant E. Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2. JOURNAL OF PHYSICAL CHEMISTRY B. 1999;103(46):10102–8.
- IEEE
- [1]P. Van Der Voort, M. Baltes, and E. Vansant, “Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2,” JOURNAL OF PHYSICAL CHEMISTRY B, vol. 103, no. 46, pp. 10102–10108, 1999.
@article{8054330, abstract = {{The use of dimethyldichlorosilane as a coupling agent for the grafting of VOx structures on the MCM-48 surface produces a material that is simultaneously hydrophobic (immiscible with water) and very active (all V centers are accessible, even for water molecules). The VOx surface species are grafted by the molecular designed dispersion of VO(acac)(2) on the silylated surface, followed by a calcination in air at 450 degrees C. These hydrophobic MCM-48 supported VOx catalysts are thermally stable up to 500 degrees C. The grafted VOx surface species are very resistant toward leaching-out in aqueous media. Also, the structural and hydrothermal stability has improved enormously. The crystallinity of the materials does not decrease when the samples are subjected to a hydrothermal treatment at 150 degrees C and 4.7 atm pressure. A reaction mechanism is proposed and consolidated by FT-IR, Raman spectroscopy, and UV-vis diffuse reflectance. Pore size distributions, water adsorption isotherms, and X-ray diffractograms confirm the structural stability of these materials.}}, author = {{Van Der Voort, Pascal and Baltes, M and Vansant, EF}}, issn = {{1089-5647}}, journal = {{JOURNAL OF PHYSICAL CHEMISTRY B}}, keywords = {{ADSORPTION,VANADIUM-OXIDE CATALYSTS,SURFACE,MCM-41,ACETYLACETONATE,SILICAS,SIEVES}}, language = {{eng}}, number = {{46}}, pages = {{10102--10108}}, title = {{Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2}}, url = {{http://doi.org/10.1021/jp992146u}}, volume = {{103}}, year = {{1999}}, }
- Altmetric
- View in Altmetric
- Web of Science
- Times cited: