Catalyst for purification of exhaust gas

Details Catalyst for purification of exhaust gas Catalyst for purification of exhaust gas

B - Operations, Transporting

01

J

B01J 29/072 (2006.01) B01J 29/04 (2006.01) B01J 29/87 (2006.01) B01J 29/88 (2006.01)

Patent

CA 2079091

A catalyst for purification of exhaust gases containing nitrogen oxides in the co-existence of oxygen in excess of stoichiometric amount, which catalyst comprises (a) a carrier consisting of a crystalline metallosilicate whose anhydrous state is represented by the following chemical formula [(x + y)/n]R (MXAlySiz)O2 wherein R is at least one cation having a valence n; x, y and z are, respectively, mole fractions of different metal elements M, Al and Si present as a tetrahedral oxide in the skeletal structure; M is at least one metal selected from the group consisting of Ga, Fe, Y and rare earth elements; X + Y + z = 1,000, x 0, y > 0 and 0.990 z 0.882, and (b) a co-precipitated compound oxide of copper and gallium, supported on said carrier in a dispersed state. The present invention provides a catalyst for NOx abatement which can be used for treatment of exhaust gases containing nitrogen oxides in the co-existence of oxygen in excess of stoichiometric amount and which has high NOx abatement activity and very high durability over a wide temperature range.

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