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, M_x O_y·Re₂O₇/Al₂O₃(M_x O_y= 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.