Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1990-06-21
1992-07-07
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
4232135, B01J 2104, B01J 2310, B01J 2342, B01J 2344
Patent
active
051283069
ABSTRACT:
A catalyst composition includes a catalytic material containing a platinum catalytic component dispersed on a bulk ceria and a palladium catalytic component; the palladium catalytic component may be dispersed either on the ceria or on another support, such as an activated alumina support. The catalytic material, which may include a refractory binder, such as alumina, may be dispersed as a washcoat on a suitable carrier, e.g., a cordierite honeycomb-type carrier having a plurality of fine gas flow passages extending therethrough. The bulk ceria may be stabilized with a zirconia stabilizer and/or a lanthana stabilizer. The catalyst composition has utility as an oxidation catalyst and as a three-way conversion catalyst. In the latter case, its activity for the reduction of nitrogen oxides may optionally be supplemented either by adding a rhodium-containing catalytic overcoat or by providing a catalyst assembly in which the above-described catalyst composition is placed in series with any suitable nitrogen oxides reduction catalyst.
REFERENCES:
patent: 4299734 (1981-11-01), Fujitani et al.
patent: 4587231 (1986-05-01), Sawamura et al.
patent: 4708946 (1987-11-01), Ohata et al.
patent: 4714694 (1987-12-01), Wan et al.
patent: 4727052 (1988-02-01), Wan et al.
Dettling Joseph C.
Lui Yiu-Kwan
Engelhard Corporation
Shine W. J.
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