Catalyst compound for purifying exhaust gas, catalyst...

B - Operations – Transporting – 01 – J

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B01J 27/24 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2427081

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 )x Mo2V x Q(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.

L'invention concerne un composé catalytique purifiant les gaz d'échappement lequel est représenté par une formule rationnelle: (NH4)xMo2VxO(3x+6) (dans laquelle x est compris entre 2,8 et 3,2) et présentant un rapport atomique V/Mo de 3/2, et un procédé de préparation du composé catalytique caractérisé en ce qu'il consiste à faire réagir de l'oxyde de molybdène (MoO3) avec du métavanate d'ammonium (NH4VO3) en la présence d'eau pendant une durée spécifique. Le catalyseur est préparé sans activation par cuisson, ce qui a constitué un obstacle pour obtenir une activité catalytique élevée dans l'art antérieur, tout en réalisant une formation complexe satisfaisante de V et Mo, et par conséquent il présente une activité améliorée de façon remarquable, en particulier à basse température, et également en durabilité.

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