Method for purification of lean-burn engine exhaust gas

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

1992-04-27

1994-07-12

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232132, 4232392, 423246, B01D 4700, B01J 802, C01B 2100, C01B 3118

Patent

active

053286723

ABSTRACT:
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 NO.sub.x and HC at high efficiency in an oxygen-rich automotive exhaust gas, and for treating the exhaust gas with the dual-phase catalyst above.

REFERENCES:
patent: 3346328 (1967-10-01), Sergeys et al.
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 5041270 (1991-08-01), Fujitani et al.

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