NOx purifying catalyst

Details NOx purifying catalyst NOx purifying catalyst

2007-07-12

2010-02-16

Vanoy, Timothy C (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S527120, C502S527130, C502S304000, C502S325000, C502S349000, C502S344000, C502S340000

Reexamination Certificate

active

07662743

ABSTRACT:
The present invention provides an NOx purifying catalyst that removes NOx with sufficient efficiency even under low temperature operation such as diesel engine automobiles. An NOx purifying catalyst for processing NOx in exhaust gas by rich/lean control of the air-fuel ratio of the exhaust gas, includes a first catalytic layer containing β-zeolite having iron and/or cerium elements, and a second catalytic layer including a noble metal and cerium oxide-based material; in which the second and the first catalytic layers are coated on a support in that order so that the first catalytic layer is the uppermost layer. The NOx purifying catalyst purifies NOx as showed in Reaction Formulations (1) to (4).in-line-formulae description="In-line Formulae" end="lead"?Lean condition 1: NO+½O2→NO2  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Rich condition: CO+H2O→CO2  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?NOx+H2→NH3  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Lean condition 2: NOx+NH3+O2→N2+H2O  (4).in-line-formulae description="In-line Formulae" end="tail"?

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