Method of preparing supported oxidation catalysts for producing ethylene oxide

Abstract

Abstract A METHOD FOR PREPARING A SUPPORTED CATALYST FOR USE IN OXIDIZING ETHYLENE TO ETHYLENE OXIDE, SAID SUPPORTED CATALYST CONSISTING ESSENTIALLY OF SILVER TO THE EXTENT OF 7 TO 30% BY WEIGHT WITH RESPECT TO THE SUPPORT, AND OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM AND GOLD TO AN EXTENT OF FROM 0.01 TO 1.0% BY WEIGHT WITH RESPECT TO SAID SILVER, WHICH COMPRISES: (A) IMPREGNATING A SOLID, INERT SUBDIVIDED SUPPORT, AT A TEMPERATURE OF FROM 60* C.TO 115* C., WITH A SOLUTION OF SILVER LACTATE IN LACTIC ACID CONTAINING IN SUSPENSION, CARBON AND AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF PALLADIUM, PLATINUM AND GOLD, SAID LACTIC ACID BEING PRESENT IN A MOLAR EXCESS OF FROM 20% TO 200% WITH RESPECT TO THE NUMBER OF MOLS REQUIRED FOR COMPLETE SALIFICATION OF SAID SILVER. (B) DRYING THE PARTICLES THUS IMPREGNATED IN A STREAM OF AIR AT A TEMPERATURE RISING TO A MAXIMUM, BUT NOT EXCEEDING 130* C. FOR A PERIOD OF FROM 1 TO 3 HOURS, AND (C) SUBJECTING THE PARTICLES THUS IMPREGNATED TO A HEAT TREATMENT, SAID TEMPERATURE BEING RAISED GRADUALLY TO A MAXIMUM LEVEL OF BETWEEN 230* C. AND 360* C. OVER A PERIOD OF 10 TO 15 HOURS.

Inventors

• 👤 Benedetto Calcagno
• 👤 Natale Ferlazzo
• 👤 Marcello Ghirga

Bibliographic Details