The influence of chelating polyolefins on the disproportionation of propylene catalyzed by WO3 on silica

Addition of small amounts of polyolefins to the propylene feed increased propylene disproportionation conversion over a tungsten oxide on silica catalyst, and shortened the catalyst break-in period. These results are attributed to an increase in the number of active sites through modification by the polyolefins of the energy level distribution in the tungsten oxide centers.