The Activation and Stabilization of a Tungsten Oxide-Silica Catalyst for the Disproportionation of Propylene by the Addition of a Mixture of Carbon Tetrachloride and Isobutylamine

Abstract

The Disproportionation of propylene Over a tungsten oxide-silica catalyst in the presence of carbon tetrachloride, isobutylamine and their mixture was investigated using a fixed-bed flow reactor under atmospheric pressure. The activity of the catalyst was more greatly enhanced by the addition of isobutylamine to the reaction system afser the addition of CC!, than by adding CCl₄ or isobutylamine alone, but the enhanced activity gradually decreased during the reaction in the presence of isobutylamine (Fig.1). The addition of a mixture of CCl₄ and isobutylamine stabilized the catalyst activity, which was slightly lower than the activity obtained immediately after adding isobutylamine following the addition of CCl₄ (Fig.2, 3).