Patent ID: 8765630
Filing Date: 2014-07-01
Classification: B01J,C07D

Abstract:
1. A catalyst for the manufacture of alkylene oxide by the vapor-phase epoxidation of alkene, said catalyst comprising impregnated silver and at least one efficiency-enhancing promoter on a refractory solid support, wherein the refractory solid support comprises zirconium silicate in an amount from about 0.3 to 3.0% by weight of zirconium silicate based on the total weight of the support wherein the refractory solid support, exclusive of zirconium silicate, is at least 95% by weight alpha alumina, and wherein the refractory solid support, exclusive of zirconium silicate, contains less than about 500 ppmw alkaline earth metal excluding calcium compounds, measured as the alkaline earth metal oxide, and less than about 350 ppmw calcium.