Surface acidity of some Re2O7-containing metathesis catalysts. An in situ Fourier transform infrared study using pyridine adsorption

Abstract
Surface acidity of several metathesis catalysts, Re2O7/Al2O3, Mx Oy·Re2O7/Al2O3(Mx Oy= V2O5, MoO3 or WO3) and Re2O7/SiO2·Al2O3, have been studied in situ by Fourier transform infrared spectroscopy using pyridine adsorption. A distinct correlation has been found between the activity for metathesis and Brönsted acidity of the catalysts, while their Lewis acidity showed no correlation with the activity.

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