Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Reexamination Certificate
2011-03-15
2011-03-15
Silverman, Stanley (Department: 1736)
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
C423S213200, C423S213500, C502S064000, C502S065000, C502S067000, C502S069000, C502S073000, C502S074000, C502S527120
Reexamination Certificate
active
07906449
ABSTRACT:
The present invention is a selective catalytic reduction type catalyst for purifying nitrogen oxides in exhaust gas exhausted from lean combustion engines using ammonia or urea as a reducing agent, it is provided with a selective catalytic reduction type catalyst The catalyst comprises a lower-layer catalyst layer (A) having an oxidative function for nitrogen monoxide (NO) in exhaust gas and an upper-layer catalyst layer (B) having an adsorbing function for ammonia on the surface of a monolithic structure type carrier (C), and that the lower-layer catalyst layer (A) comprises a noble metal component (i), an inorganic base material constituent (ii) and zeolite (iii), and the upper-layer catalyst layer (B) comprises substantially none of component (i) but the component (iii).
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Ando Ryuji
Hihara Takashi
Kanno Yasuharu
Nagata Makoto
Edwards Angell Palmer & & Dodge LLP
N.E. Chemcat Corporation
Silverman Stanley
Walck Brian
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