A PROCESS FOR MAKING RARE EARTH METAL OXIDE-COATED MICROPOROUS MATERIALS

摘要

A PROCESS FOR MAKING A CATALYTIC RARE EARTH METAL OXIDE-COATED MICROPOROUS PARTICULATE MATERIAL HAVING THE RARE EARTH METAL OXIDE COATED ON OUTER SURFACES OF SAID MICROPOROUS PARTICULATE MATERIAL,SAID PROCESS COMPRISING THE STEPS OF: I) COMBINING AN AMOUNT OF A COLLOIDAL DISPERSION OF RARE EARTH METAL OXIDE HYDRATE WITH A COMPATIBLE MICROPOROUS PARTICULATE MATERIAL TO FORM A SLURRY,SAID MICROPOROUS PARTICULATE MATERIAL HAVING AN AVERAGE PORE SIZE LESS THAN THE PARTICLE SIZE OF SAID COLLOIDAL DISPERSION,TO POSITION THEREBY SAID COLLOIDAL DISPERSION ON THE OUTER SURFACES OF SAID MICROPOROUS PARTICULATE MATERIAL; AND II) HEAT TREATING SAID SLURRY TO FIX THE RARE EARTH METAL OXIDE TO THE OUTER SURFACE OF THE MICROPOROUS PARTICULATE MATERIAL.