Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1991-07-24
1992-09-01
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
B01J 800, C01B 2100
Patent
active
051437074
ABSTRACT:
Emissions of nitrogen oxides (NO.sub.X) to the atmosphere are reduced by treatment of gases containing nitrogen oxides with a reducing agent such as ammonia in the presence of a catalyst containing a mesoporous crystalline catalyst. The mesoporous crystalline catalyst comprises an inorganic, non-layered, porous, crystalline phase aluminosilicate material which exhibits a benzene adsorption capacity of greater than about 15 grams benzene per 100 grams at 50 torr and 25.degree. C. In its preferred catalytic form, the crystalline material has a uniform, hexagonal arrangement of pores with diameters of at least about 13 .ANG. and exhibiting, after calcination, an X-ray diffraction pattern with at least on d-spacing greater than about 18 .ANG. and a hexagonal electron diffraction pattern that can be indexed with a d.sub.100 value greater than about 18 .ANG. which corresponds to at least one peak in the X-ray diffraction pattern.
REFERENCES:
patent: 3689212 (1972-09-01), Petit et al.
patent: 4778665 (1988-11-01), Krishnamurthy
patent: 4929586 (1990-05-01), Hegedus et al.
patent: 4973399 (1990-11-01), Green et al.
Beck Jeffrey S.
Shihabi David S.
Socha Richard F.
Vartuli James C.
Heller Gregory A.
Keen Malcolm D.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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