CATALYST FOR LEAN BURN ENGINE FOR AUTOMOBILE AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To obtain a catalyst having wide activity temperature rang and improved activity per catalyst atom and suitable for cleaning lean burnt exhaust gas and a manufacturing method thereof. SOLUTION: The manufacturing method of the catalyst is composed of a stage (I) to prepare a zeolite carrier impregnated with platinum by sublimating PtCl2 under the flow of CO gas at 220-250 deg.C to form Pt(CO)2Cl2 vapor and depositing on ZSM-5 structured zeolite carrier (Pt/ZSM-5), a stage (II) to wash the zeolite carrier (Pt/ZSM-5) impregnated with Pt with distilled water and to dry at 80-150 deg.C for 8-16 hr and a stage (III) to fire the dried carrier at 300-600 deg.C for 3-7 hr.