Process for decreasing the content of nitrogen oxides in flue ga

Details Process for decreasing the content of nitrogen oxides in flue ga Process for decreasing the content of nitrogen oxides in flue ga

1987-05-07

1988-12-20

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

047924390

ABSTRACT:
A process for decreasing the content of nitrogen oxides in flue gases. The process comprising contacting the flue gases with a catalyst. The catalyst contains at least one of the metals titanium, zirconium, vanadium, tungsten, molybdenum, or cerium in the form of one or more of their oxides combined with a silicate with a layer structure (layer silicate) comprising acid-activated kaolin. The crystalline layer structure of the acid-activated kaolin is essentially retained, while being not yet X-ray amorphous. The acid activation increases the BET surface area at least 15% and preferably at least 50% in terms of the BET surface area of the kaolin before acid activation. The atomic ratio of the silicon in the acid-activated kaolin to the metal in the oxide is from 0.2 and 50 and preferably from 0.4 to 25.

REFERENCES:
patent: 3962135 (1976-06-01), Alafandi
patent: 4140654 (1979-02-01), Yoshioka et al.
patent: 4176091 (1979-11-01), Inaba et al.
patent: 4282115 (1981-08-01), Atsukawa et al.

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