Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1988-04-07
1989-09-19
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423244, B01J 800, C01B 2100, C01B 1700
Patent
active
048679542
ABSTRACT:
This invention relates to a method for catalytically reducing one or more nitrogen oxides from a gaseous stream containing one or more nitrogen oxides and optionally one or more sulfur oxides which comprises contacting said gaseous stream and ammonia with a microporous molecular sieve composition at effective reduction conditions in which the amount of ammonia in said method is excessive over the stoichiometric amount necessary for catalytically reducing one or more nitrogen oxides from said gaseous stream, wherein said microporous molecular sieve composition is (i) optionally acid treated with an inorganic or organic acid, (ii) hydrogen-forming cation exchanged and (iii) optionally metal cation exchanged, prior to said contacting in said method, and wherein at least a portion of excessive ammonia in said method is oxidized without substantial adverse effect on catalytically reducing one or more nitrogen oxides from said gaseous stream.
REFERENCES:
patent: 4046888 (1977-09-01), Maeshima et al.
patent: 4157375 (1979-06-01), Brown et al.
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 4473535 (1984-09-01), Kittrell et al.
patent: 4738941 (1988-04-01), Dufresre et al.
Best Donald F.
Risch Alan P.
Staniulis Mark T.
Vassilakis James G.
Heller Gregory A.
McBride Thomas K.
UOP
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