Effects of support composition and pretreatment conditions on the structure of vanadia dispersed on SiO2, A12O3, TiO2, ZrO2 and HfO2

Article Abstract:

A study to investigate the structure of vanadia supported on SiO2, A1O3, TiO2, ZrO2 with the use of X-ray absorption, UV-visible and Raman spectroscopy is discussed.

Research and Development in the Physical, Engineering, and Life Sciences, Chemistry, Analysis, Chemical research

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Effects of temperature on the Raman spectra and dispersed oxides

Article Abstract:

An investigation of the effects of temperature on the intensities and positions of Raman bands of bulk and supported metal oxides is presented. The results show that bulk oxides exhibit an increase in optical absorption with increasing temperature due to a loss of oxygen and the consequent formation of nonstoichiometric oxides and stoichiometric suboxides.

Usage, Thermal properties, Metallic oxides, Metal oxides, Raman spectroscopy

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Nature, density, and catalytic role of exposed species on dispersed VO(sub x)/CrO(sub x)/Al(sub 2)O(sub 3) catalysts

Article Abstract:

The structure and surface composition of CrO(sub x) and VO(sub x) dispersed on alumina and their effects on the rate and selectivity of oxidative dehydrogenation (ODH) of propane were examined and compared to that of CrO(sub x) and VO(sub x) dispersed on alumina. CrAl undergoes autoreduction of CrO(sub x) species during calcination, resulting in the appearance of Cr(super 3+) cations and highest ODH activity and propene selectivity was observed for VO(sub x)/CrO(sub x)/Al(sub 2)O(sub 3).

Electric properties, Dehydrogenation, Chromium dioxide

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