Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1984-11-15
1986-05-06
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 2106, B01J 2310
Patent
active
045872317
ABSTRACT:
A method of producing a monolithic three-way catalyst for the purification of exhaust gases of internal combustion engines. First, a mixed oxide coating is provided to a monolithic carrier by treating the carrier with a coating slip in which an active alumina powder containing cerium in oxide form is dispersed together with a ceria powder and then baking the treated carrier. Next, Pt, Rh and/or Pd are deposited on the oxide coating by a known thermal decomposition process. The addition of the ceria powder to the coating slip is effective in enhancing the CO, HC and NO.sub.x conversions and durability of the produced catalyst at high temperatures. Preferably the content of Ce in the active alumina powder is 1-5 wt %, and, in the coating after baking, Ce of the ceria powder amounts to 5-50 wt % of the coating. Optionally a zirconia powder too may be added to the coating slip such that Zr of the zirconia powder amounts to 1-10 wt % of the coating.
REFERENCES:
patent: 3850847 (1974-11-01), Graham et al.
patent: 3993572 (1976-11-01), Hindin et al.
patent: 4206087 (1980-06-01), Keith et al.
patent: 4294726 (1981-10-01), Bozon et al.
patent: 4367162 (1983-01-01), Fujitani et al.
Eto Yoshiyuki
Masuda Koji
Mine Junichi
Sawamura Keiichi
Nissan Motor Co,. Ltd.
Shine W. J.
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