(720d) The Structure-Reactivity Relationship for Metathesis Reaction Between Ethylene and 2-Butene of WO3/SiO2 Catalysts Influenced by Different Calcination Temperatures

Abstract—At present olefin metathesis is one of the most often used transformations in modern chemical synthesis. It is an attractive reaction for the transformation of low value feedstocks into useful chemical products as important petrochemicals, polymers, oleochemicals and specialty chemicals. In the field of petrochemicals the most important applications are the olefin conversion technology process and the Shell higher olefins process, both upgrading less valuable alkenes into the desired products.The effect of calcination temperatures on the active species of WO₃/SiO₂ catalysts for propylene production from metathesis of ethylene and 2-butene was studied to elucidate the structure-reactivity relationship. The influence of calcination temperatures on catalyst physicochemical properties, relating to the active species, was summarized from an array of characterization results. It has been found that the surface tetrahedral tungsten species with high metal support interaction were formed on the catalyst calcined at 550 ^oC as confirmed by Raman, UV-Vis and H₂-TPR spectra, respectively.