Catalyst for purification of lean-burn engine exhaust gas

Details Catalyst for purification of lean-burn engine exhaust gas Catalyst for purification of lean-burn engine exhaust gas

B - Operations, Transporting

01

J

B01J 29/14 (2006.01) B01D 53/94 (2006.01) B01J 29/072 (2006.01) B01J 29/16 (2006.01) B01J 29/24 (2006.01) B01J 29/26 (2006.01) B01D 53/36 (1990.01)

Patent

CA 2115039

- 12 - ABSTRACT CATALYST FOR PURIFICATION OF LEAN-BURN ENGINE EXHAUST GAS A dual-phase zeolite having a transition metal- containing zeolite phase and a transition metal-containing oxide phase. The catalytic material may be an intimate mixture of a phase-layered structure of a first phase constituted preferably of a copper-containing high silica zeolite and a second phase constituted of copper- containing zirconia. Methods are also disclosed for making a single- stage catalyst for removing NOx and HC at high efficiency in an oxygen-rich automotive exhaust gas, and for treating the exhaust gas with the dual-phase catalyst above.

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