| 摘要 |
PURPOSE:To provide a catalyst of considerably improved activity by incorporating-specific atomic ratios of Na and Cl in addn. to silver in the catalyst at the time of producing ethylene oxide by oxidizing ethylene with molecular oxygen. CONSTITUTION:The catalyst is incorporated with at least Na as a cationic component and Cl as an anionic component, in addition to silver. As an Na source, for example, Na2CO3 is preferable, and is contained at about <=1.25wt% based on the weight of the catalyst and preferably at about <=0.58 atomic ratio to silver. As a Cl source, for example, NaCl is preferable and the atomic ratio of Cl/Na is kept at <=1. The amt. of the silver deposited on the catalyst is set at about 1-25wt%. The Na source and the Cl source are dissolved in an aq. solvent, and the soln. is impregnated with a porous refractory carrier having 0.05-10<2>m/g surface area, and at least 20% apparant porosities, more preferably, a carrier consisting essentially of alpha-alumina, and the carrier is dried by heating, whereby the desired catalyst is obtained. |
