Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1992-08-12
1994-01-04
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232392, B01D 4700, B01D 5334, B01J 800, C01B 2100
Patent
active
052757951
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: 5041272 (1991-08-01), Tamura et al.
Chattha Mohinder S.
Gandhi Haren S.
Montreuil Clifford
Ford Motor Company
Heller Gregory A.
Malleck Joseph W.
May Roger L.
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