V2O5/Y - AI2O3 catalysts

We have measured the differential heats of reoxidation and the reaction characteristics of a number of V2O5/Y-AI2O3 catalysts. The chemical transformation corresponding to the heat measurement in this system is ... 

For various types of catalyst there are results of kinetic investigations for the oxidative dehydrogenation of ethane available (e.g., for a magnesium oxide catalyst doped with samarium oxide, lithium nitrate and ammonium chloride [64] or a V2O5/Y-AI2O3 catalyst [68]). In another study with a Sn.oLai.oNdi.oOx catalyst, investigations were reported of noncatalytic reactions, which were found to be significant at temperatures above 700 °C [69]. 

A 20wt% V2O5/Y-AI2O3 catalyst has been subjected to a TPR in ethane and reoxidation in air using TG-DSC equipment, and compared to bulk vanadium pent-oxide. Reduction in ethane occurs at a lower temperature on the V2O5/Y-AI2O3 catalyst (717 compared with 794 K for bulk vanadium pentoxide). The exothermic... 

The role of metal oxides as promoters of V2O5/Y-AI2O3 catalysts in the oxidative dehydrogenation of propane... 

The physicochemical properties of potassium-, bismuth-, phosphorous- and molybdenum-doped (MeA7 atomic ratios of 0 to 1) V2O5/Y-AI2O3 catalysts and their catalytic behavior in the oxidative dehydrogenation of propane have been compared. The incorporation of metal oxides modifies the catalytic behavior of alumina-supported vanadia catalysts by changing both their redox and their acid-base properties. In this way, the addition of potassium leads to the best increase in the selectivity to propylene. This performance can be related to the modification of the acid character of the surface of the catalysts. The possible role of both redox and acid-base properties of catalysts on the selectivity to propylene during the oxidation of propane is also discussed. 

Figure 4. Variation of the selectivities to propylene ( ) CO ( ) and CO2 ( ) in the ODH of propane on a V2O5/Y-AI2O3 catalyst (3.5 wt% V-atoms) at 500-500 C. Experimental conditions in text.

Gao L, Zhang D, Wang Y, Xue W, Zhao X (2011) Direct amination of toluene to toluidine with hydroxylamine over CUO-V2O5/AI2O3 catalysts. React Kinet Mech Catal 102 377-391... 

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