Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2006-04-04
2006-04-04
Johnson, Edward M. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
Reexamination Certificate
active
07022646
ABSTRACT:
A layered catalyst composite for controlling vehicular exhaust emissions is disclosed. The composite comprises a substrate such as cordierite, at least one bottom layer deposited on the substrate containing a precious metal component such as platinum and at least one NOxstorage component present in the amount of about 0.3 to about 1.5 g/in3, and at least one top layer deposited on the bottom layer containing a precious metal component such as platinum and at least one NOxstorage component present in the amount of about 0.0 to less than about 0.3 g/in3.
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Engelhard Corporation
Johnson Edward M.
Negin Richard A.
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