OXIDE CATALYST DOPED WITH METAL/METALLIC OXIDE HAVING HIGH DENITRATION SELECTIVITY ON LEAN NOx EXHAUST GAS POST-TREATMENT SYSTEM
PROBLEM TO BE SOLVED: To provide an oxide catalyst which is doped with a metal/a metallic oxide having high denitration selectivity on a lean NOx exhaust gas post- treatment system. SOLUTION: A lean NOx catalyst and its making method is disclosed. The lean NOx catalyst includes a ceramic substrate,...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an oxide catalyst which is doped with a metal/a metallic oxide having high denitration selectivity on a lean NOx exhaust gas post- treatment system. SOLUTION: A lean NOx catalyst and its making method is disclosed. The lean NOx catalyst includes a ceramic substrate, an oxide carrier material deposited on the substrate, preferably γ-alumina, and a metallic accelerator or a dorpant incorporated into the oxide carrier material. The metallic accelerator or the dorpant is selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium, cerium, vanadium, its oxide and combination thereof. γ-Alumina has pore volume of preferably about 0.5 to about 2.0 cc/g, a surface area of about 80 to 350 m2/g, a mean pore diameter of about 3 to 30 nm, and a level of impurities of less than 0.2 wt.% or equivalent in 0.2 wt.%. In a preferable embodiment, γ-alumina is preferably made by means of a sol-gel process along with metal doping of γ-alumina carried out by using an initial wet impregnation technique. COPYRIGHT: (C)2003,JPO |
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