Catalysts for gasoline engine exhaust gas treatments
A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component supported on a first PGM support material, wherein the first PGM component comprises platinum and rhodium; and wherein the first PGM support material comprises ZrO 2 —Al 2 O 3 .
1 . A catalytic article for treating exhaust gas comprising:
a substrate comprising an inlet end and an outlet end with an axial length L;
a first catalytic region comprising a first platinum group metal (PGM) component supported on a first support material; wherein the first support material comprises ZrO 2 —Al 2 O 3 ;
wherein the ZrO 2 —Al 2 O 3 contains 1-50 wt. % ZrO 2 ; and wherein the first catalytic region is substantially free of alkaline-earth metal.
2 . The catalytic article of claim 1 , wherein the ZrO 2 —Al 2 O 3 contains 5-50 wt. % ZrO 2 .
3 . The catalytic article of claim 1 , wherein the ZrO 2 —Al 2 O 3 further comprises La, Mn, Cu, Ti, or Ni.
4 . The catalytic article of claim 1 , wherein the first PGM component is selected from the group consisting of platinum, palladium, rhodium, and a mixture thereof.
5 . The catalytic article of claim 4 , wherein the first PGM component comprises Pt and Rh.
6 . The catalytic article of claim 1 , wherein the ZrO 2 —Al 2 O 3 is substantially free of Ce.
7 . The catalytic article of claim 1 , wherein the total PGM loading in the first catalytic region is up to 50 g/ft 3 .
8 . The catalytic article of claim 1 , wherein the first catalytic region further comprises a first oxygen storage capacity (OSC) material.
9 . The catalytic article of claim 8 , wherein the first OSC material is cerium oxide, a ceria-zirconia mixed oxide, an alumina-ceria-zirconia mixed oxide, or a combination thereof.
10 . The catalytic article of claim 1 , wherein the first catalytic region is essentially free of alkaline-earth metal.
11 . The catalytic article of claim 1 , further comprising a second catalytic region.
12 . The catalytic article of claim 11 , wherein the second catalytic region comprises a second PGM component.
13 . The catalytic article of claim 11 , wherein the second catalytic region further comprises a second OSC material and/or a second inorganic oxide.
14 . The catalytic article of claim 13 , wherein the second OSC material is cerium oxide, zirconium oxide, a ceria-zirconia mixed oxide, an alumina-ceria-zirconia mixed oxide or a combination thereof.
15 . The catalytic article of claim 13 , wherein the second inorganic oxide is selected from the group consisting of alumina, magnesia, silica, zirconia, lanthanum, cerium, neodymium, praseodymium, yttrium oxides, and mixed oxides or composite oxides thereof.
16 . The catalytic article of claim 11 , wherein the second catalytic region extends for the axial length L.
17 . The catalytic article of claim 11 , wherein the second catalytic region is supported/deposited directly on the substrate.
18 . The catalytic article of claim 1 , wherein the first catalytic region extends for the axial length L.
19 . The catalytic article of claim 1 , wherein the first catalytic region is supported/deposited directly on the substrate.
20 . A system for treating vehicular exhaust gas comprising the catalytic article of claim 1 .