PREPARATION OF PD AL2O3/AL CATALYSTS FOR CO REMOVAL/

Aluminum was carefully anodized, then palladium salts were supported o n its Al2O3 surface layer by ion-exchange. CO 3.76 vol% contained in t he air can be eliminated at around 200 degrees C. Both anodization con ditions and the nature of the precursor solutions affect catalyst natu re, particularly the pH value of the precursor solutions. The pH value of the solution suitable for supporting active components is 5-6. Pal ladium, which is present as Pd2+ and Pd4+ after calcination, distribut es uniformly on the support surface which had a honeycomb structure.