Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1988-11-15
1990-08-07
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
049466615
ABSTRACT:
A process for removing nitrogen oxides from exhaust gases containing volatile metal compounds with good efficiency by contacting the gases with a catalyst comprising TiO.sub.2, difficulty reduced by the compounds, in the presence of ammonia, and such a catalyst are provided, which process is characterized in that the average pore diameter of the TiO.sub.2 is 10,000 .ANG. or less and the proportion of the volume of pores having pore diameters of 400-5,000 .ANG. to the total pore volume is 50% or more; a denitration-active component is supported on the TiO.sub.2 ; a catalyst carrier precursor comprising an aqueous slurry sol of TiO.sub.2 or Ti hydroxide prepared by hydrolyzing a Ti salt is precalcined at 150.degree.-700.degree. C., followed by adding a denitration-active component and then normally calcining the mixture; and a polymer compound having a thermal decomposition temperature of 110.degree. to 300.degree. C. is added in 1-20% by weight to the catalyst carrier precursor, followed by precalcining the mixture at the thermal decomposition temperature or higher.
REFERENCES:
patent: 4085193 (1978-04-01), Nakajima et al.
patent: 4141959 (1979-02-01), Kato et al.
patent: 4188365 (1980-02-01), Yoshioka et al.
patent: 4221768 (1980-09-01), Inoue et al.
Kamo Tomoichi
Kato Akira
Kato Yasuyoshi
Kawagoshi Hiroshi
Matsuda Shinpei
Babcock-Hitachi Kabushiki Kaisha
Heller Gregory A.
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