NDLI: In situ UV-visible spectroscopic measurements of kinetic parameters and active sites for catalytic oxidation of alkanes on vanadium oxides.

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In situ UV-visible spectroscopic measurements of kinetic parameters and active sites for catalytic oxidation of alkanes on vanadium oxides.

Content Provider	Semantic Scholar
Author	Chen, Kaidong Bell, Alexis T.
Copyright Year	2005
Abstract	In situ diffuse reflectance UV-visible spectroscopy was used to measure the dynamics of catalyst reduction and oxidation during propane oxidative dehydrogenation (ODH) on VOx/gamma-Al2O3. Transients in UV-visible intensity in the near-edge region were analyzed using a mechanistic model of ODH reactions. Rate constants per site for the kinetically relevant reduction step (C-H bond activation) measured using this analysis are slightly larger than those obtained from steady-state ODH rates normalized by surface V. The ratio of these values provides a measure of the fraction of the V surface sites that are active for ODH (0.6-0.7, for V surface densities of 2.3-34 V nm(-2)). This suggests that some of the V atoms are either inaccessible or inactive. Reoxidation rate constants, which cannot be obtained from steady-state analysis, are 10(3)-10(5) times larger than those for the C-H bond activation reduction step.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://iglesia.cchem.berkeley.edu/Publications/JPhysChemB_109_2414_2005.pdf
PubMed reference number	16851236v1
Volume Number	109
Issue Number	6
Journal	The journal of physical chemistry. B
Language	English
Access Restriction	Open
Subject Keyword	Alkanes Inactive - Biochemical Activity Level Kinetics Large Lindane Oxides Propane Respiratory Burst UV-VIS Spectrum Vanadium Vanadium/Creatinine:SRto:Pt:Urine:Qn density oxidation
Content Type	Text
Resource Type	Article

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