Exhaust gas purifying catalyst compound, catalyst comprising...

Details Exhaust gas purifying catalyst compound, catalyst comprising... Exhaust gas purifying catalyst compound, catalyst comprising...

2006-02-28

2006-02-28

Johnson, Christina (Department: 1725)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Nitrogen compound containing

C502S305000, C502S312000, C502S321000, C502S353000, C502S350000

Reexamination Certificate

active

07005402

ABSTRACT:
The invention is to provide (i) a catalyst which does not require an activation of catalyst components by means of a calcination which has become a hindrance in the way of obtaining a catalyst having a high activity through a conventional technology and in which catalyst the compositing of vanadium with molybdenum is contemplated more than enough; ii) a method for producing the catalyst; (iii) a catalyst having an activity, especially having an activity at low temperatures and a durability both greatly increased; (iv) a catalyst compound for purifying an exhaust gas, in which compound the ratio of vanadium atom to molybdenum atom (V/Mo) is 3/2 or close thereto and which compound is expressed by the rational formula (NH4)xMo2VxO(3x+6)wherein x is 2.8 to 3.2; and (v) a method for producing the catalyst compound through a step for reacting molybdenum oxide (MoO3) with ammonium metavanadate (NH4VO3) in the co-presence of water for a prescribed period of time.

REFERENCES:
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patent: 4001316 (1977-01-01), Ishimi
patent: 5104844 (1992-04-01), Yamamoto et al.
patent: 5166122 (1992-11-01), Teshima et al.
patent: 6054408 (2000-04-01), Hums et al.
patent: 2004/0229753 (2004-11-01), Hibst et al.
patent: 49-126616 (1973-04-01), None
patent: 2000-26123 (2000-01-01), None

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