Catalyst preparation and activation process

Claim 1

IN THE MANUFACTURE OF A HALOGEN CONTAINING CATALYST COMPRISING AN ACTIVE METAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM AND RHODIUM DISPERSED ON AN ALUMINA BASE, THE IMPROVEMENTS WHICH COMPRISE: (1) IN THE ACTIVATION OF THE ALUMINA BASE BY CALCINING SAME, MEASURING AT REGULAR INTERVALS THE SURFACE AREA OF THE CALCINED ALUMINA AS SAID ALUMINA EXITS FROM THE CALCINER AND INCREASING OR DECREASING THE SEVERITY OF CALCINATION AS THE SURFACE AREA IS FOUND TO BE RESPECTIVELY ABOVE OR BELOW 230$20 SQ. METERS PER GRAM OF ALUMINA, (2) IN THE ACTIVATION OF THE CATALYST BY CALCINATION AT A TEMPERATURE ABOVE ABOUT 1000*F. FOLLOWING IMPREGNATION OF THE ALUMINA BASE WITH THE ACTIVE METAL, MEASURING THE SURFACE AREA OF THE ACTIVE METAL ON THE ALUMINA BASE AT REGULAR INTERVALS AS THE CATALYST EXITS FROM THE CALCINER AN INCREASING OR DECREASING THE SEVERITY OF CALCINATION AS ACTIVE METAL SURFACE ARE IS FOUND TO BE RESPECTIVELY ABOVE OR BELOW 200$20 SQUARE METERS PER GRAM FOR PLATINUM AND 380$38 SQ. M./GM. FOR PALLADIUM AND RHODIUM AND (3) IN THE HALOGEN TREATIN GHE CATALYST MEASURING THE SURFACE AREA OF THE ACTIVE METAL AFTER HALOGEN TREATING THE CATALYST AND CONTROLLING THE SEVERITY OF HTE HALOGEN TREATMENT TO OBTAIN AN ACTIVE METAL SURFACE AREA OF 200$20 SQUARE METERS PER GRAM OF PALTINUM AND 380$38 SQUARE METERS PER GRAM OF PALLADIUM OR RHODIUM.