| 摘要 |
PURPOSE: To efficiently remove CH, CO, NOX, etc. by depositing respectively specified amts. of oxides of Ni, Fe, etc., rare earth oxides rich in lanthanum, platinum group metals and ceria on an alumina support, thereby forming a catalyst. CONSTITUTION: The alumina support heated to >=300 deg.C is impregnated with a rare earth salt-contg. soln. in which La2 O3 is contained at >=50 wt.% of the total rare earth oxide during firing and thereafter, the support is heated to oxidation decompose a lanthanum salt. Next, metal oxides for removing H2 S selected from an accelerator, NiO and Fe2 O3 and one or more kinds of the platinum group metals are added to the soln. contg. soluble cerium salt. After the support described above is impregnated in the soln., the support is heated until the cerium salt is decomposed to obtain the catalyst for controlling release gas. The catalyst contains 1 to 20 wt.% ceria which is the accelerator, 0.5 to 5 wt.% alkali metal oxide and <=10% metal for H2 S removal. |
