Method for making pellet type catalyst

摘要

A method for making improved pellet type catalysts utilizing a support material having relatively high alkali metal content, comprising the steps of grinding the support material to the desired size, forming the pellet into the desired shape and size, calcining the pellet to obtain the desired surface area, soaking the calcined pellet in a dilute acid for a short period of time to form the alkali metal salt of the acid to a controlled depth inward from the surface of the pellet, and impregnating the pellet with the desired catalytically active metallic material after draining the acid wash solution, the depth of penetration of the catalytic material being limited to the depth treated by the acid wash.