PROCESS FOR PREPARING ZIRCONIUM-CERIUM-BASED MIXED OXIDES

摘要

A PROCESS FOR PREPARING ZIRCONIUM-CERIUM BASED MIXED OXIDES WHICH COMPRISES REACTING AN ALKALI WITH AN AQUEOUS SOLUTION OF A ZIRCONIUM SALT CONTAINING 0.42-0.7 MOLE OF SULPHATE ANION (SO4²) PER MOLE OF ZIRCONIUM CATION AT A TEMPERATURE OF NOT GREATER THAN 50°C,IN THE PRESENCE OF A CERIUM SALT TO FORM A CERIUM-ZIRCONIUM MIXED HYDROXIDE,AND THEN CALCINING THE CERIUM ZIRCONIUM MIXED HYDROXIDE TO FROM A MIXED OXIDE.THE MIXED OXIDES POSSED GOOD THERMAL STABILITY AND ARE ESSENTIALLY SINGLE PHASE AND ARE SUITABLE AS PROMOTERS AND CATALYST SUPPORTS IN,PARTICULARLY,SOTOMOBILE EXHAUST SYSTEMS.(FIG 1)