Post-combustion catalysts

Details Post-combustion catalysts Post-combustion catalysts

1995-05-10

1997-04-22

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232132, 502303, 502525, 502324, 502328, B01J 802

Patent

active

056226802

ABSTRACT:
The invention relates to catalysts for the treatment of combustion gases. The catalysts include an active phase of the perovskite having the general formula: L.sub.x L'.sub.1-x M.sub.y M'.sub.z .phi..sub.1-y-z O.sub.3, wherein L is an element selected from lanthanides and rare earths, L' is an element selected from a group consisting of Sr, Ca, Ba, Ce, K, Bi, Rb or Na; M is a transition metal selected from a group consisting of Cr, Mn, Fe, Co, Ni and Cu; M' is at least one metal selected from a group consisting of Pt, Ru, Pd, Rh; .phi. is a cationic lacuna; 0<x<0.5, 0.85<y.ltoreq.1, 0.ltoreq.z<0.08 with 0.85<y+z.ltoreq.1. The catalysts of the invention are particularly useful for purifying exhaust gas from diesel engines, particularly for the removal of soot.

REFERENCES:
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patent: 4921829 (1990-05-01), Ozawa et al.
patent: 4959339 (1990-09-01), Arai
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