Catalyst – solid sorbent – or support therefor: product or process – Plural layers on a support – each layer having a distinct... – More than two overlapping layers
Reexamination Certificate
2006-06-06
2006-06-06
Nguyen, Cam N. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Plural layers on a support, each layer having a distinct...
More than two overlapping layers
C502S313000, C502S327000, C502S330000, C502S332000, C502S333000, C502S334000, C502S339000, C502S351000, C502S355000, C502S415000, C502S439000
Reexamination Certificate
active
07056859
ABSTRACT:
A catalyst for purifying exhaust gases which can suppress an active ingredient, such as an alkali metal, which reacts with a substrate from moving to the substrate, thereby preventing a decrease in strength such as thermal shock resistance of the substrate. In production, first, a first oxide layer composed mainly of an oxide which has a high reactability with the active ingredient is formed on the substrate. Next, a second oxide layer composed mainly of an oxide which has a low reactability with the active ingredient is formed on the first oxide layer. Then, a catalyst layer loaded at least with a noble metal and the active ingredient is formed on the second oxide layer. This second oxide layer suppresses transfer of the active ingredient and some active ingredient which has passed through the second oxide layer is caught by the first oxide layer owing to its reaction.
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Finnegan Henderson Farabow Garrett & Dunner LLP
Nguyen Cam N.
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