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Accessibility and dispersion of vanadyl sites of vanadium silicate-1 nanoparticles deposited in SBA-15

(2010) JOURNAL OF PHYSICAL CHEMISTRY C. 114(30). p.12966-12975
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Abstract
Vanadium silicalite-1 (VS-1) nanoparticles dispersed onto the mesoporous walls of SBA-15 silica have characteristics different from those of the full-grown VS-1. In particular, the vanadium-binding site differs extensively. Here, we monitor the local environment of VO(2+) with different electron paramagnetic resonance (EPR) techniques to obtain information about the heterogeneity of the vanadyl sites, the effect of a calcination/reduction cycle, and the subsequent adsorption of (13)CO(2) and NH(3) to the vanadyl sites for both full-grown VS-1 and VS1-SBA15. Furthermore, two-cycle CO(2) and NH(3) adsorption experiments were performed. While the latter showed no chemisorption of CO(2) at 373 K for both materials, clear evidence was found for ligation of CO(2) to vanadyl in full-grown VS-1 by the detection of a strong (13)C hyperfine value. This strong binding was not detected for the vanadyl centers in VS1-SBA15. Chemisorption of NH(3) was detected for all samples both by two-cycle adsorption experiments and by EPR.
Keywords
CATALYSTS, ADSORPTION, PROTON ENDOR, HEXAGONAL TEMPLATED SILICA, ENVELOPE MODULATION SPECTROSCOPY, HIERARCHICAL STRUCTURES, MESOPOROUS SILICA, EXCHANGED ZSM-5, MOLECULAR-SIEVE, CARBON-DIOXIDE

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Chicago
Zamani, S, M Chiesa, V Meynen, Y Xiao, B Prélot, J Zajac, Francis Verpoort, P Cool, and S Van Doorslaer. 2010. “Accessibility and Dispersion of Vanadyl Sites of Vanadium Silicate-1 Nanoparticles Deposited in SBA-15.” Journal of Physical Chemistry C 114 (30): 12966–12975.
APA
Zamani, S., Chiesa, M., Meynen, V., Xiao, Y., Prélot, B., Zajac, J., Verpoort, F., et al. (2010). Accessibility and dispersion of vanadyl sites of vanadium silicate-1 nanoparticles deposited in SBA-15. JOURNAL OF PHYSICAL CHEMISTRY C, 114(30), 12966–12975.
Vancouver
1.
Zamani S, Chiesa M, Meynen V, Xiao Y, Prélot B, Zajac J, et al. Accessibility and dispersion of vanadyl sites of vanadium silicate-1 nanoparticles deposited in SBA-15. JOURNAL OF PHYSICAL CHEMISTRY C. 2010;114(30):12966–75.
MLA
Zamani, S, M Chiesa, V Meynen, et al. “Accessibility and Dispersion of Vanadyl Sites of Vanadium Silicate-1 Nanoparticles Deposited in SBA-15.” JOURNAL OF PHYSICAL CHEMISTRY C 114.30 (2010): 12966–12975. Print.
@article{3060535,
  abstract     = {Vanadium silicalite-1 (VS-1) nanoparticles dispersed onto the mesoporous walls of SBA-15 silica have characteristics different from those of the full-grown VS-1. In particular, the vanadium-binding site differs extensively. Here, we monitor the local environment of VO(2+) with different electron paramagnetic resonance (EPR) techniques to obtain information about the heterogeneity of the vanadyl sites, the effect of a calcination/reduction cycle, and the subsequent adsorption of (13)CO(2) and NH(3) to the vanadyl sites for both full-grown VS-1 and VS1-SBA15. Furthermore, two-cycle CO(2) and NH(3) adsorption experiments were performed. While the latter showed no chemisorption of CO(2) at 373 K for both materials, clear evidence was found for ligation of CO(2) to vanadyl in full-grown VS-1 by the detection of a strong (13)C hyperfine value. This strong binding was not detected for the vanadyl centers in VS1-SBA15. Chemisorption of NH(3) was detected for all samples both by two-cycle adsorption experiments and by EPR.},
  author       = {Zamani, S and Chiesa, M and Meynen, V and Xiao, Y and Pr{\'e}lot, B and Zajac, J and Verpoort, Francis and Cool, P and Van Doorslaer, S},
  issn         = {1932-7447},
  journal      = {JOURNAL OF PHYSICAL CHEMISTRY C},
  keyword      = {CATALYSTS,ADSORPTION,PROTON ENDOR,HEXAGONAL TEMPLATED SILICA,ENVELOPE MODULATION SPECTROSCOPY,HIERARCHICAL STRUCTURES,MESOPOROUS SILICA,EXCHANGED ZSM-5,MOLECULAR-SIEVE,CARBON-DIOXIDE},
  language     = {eng},
  number       = {30},
  pages        = {12966--12975},
  title        = {Accessibility and dispersion of vanadyl sites of vanadium silicate-1 nanoparticles deposited in SBA-15},
  url          = {http://dx.doi.org/10.1021/jp103794x},
  volume       = {114},
  year         = {2010},
}

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