Method for reducing nitrogen oxides in flue gases with an arseni

Details Method for reducing nitrogen oxides in flue gases with an arseni Method for reducing nitrogen oxides in flue gases with an arseni

1993-09-22

1995-07-18

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C01B 2104

Patent

active

054339359

ABSTRACT:
An arsenic-resistant composite oxide catalyst containing oxides of at least the metals vanadium and molybdenum, in particular for reducing nitrogen oxides in flue gases in the presence of a reducing agent, such as ammonia or carbon monoxide, includes at least one composite oxide phase with a general formula V.sub.x Mo.sub.y O.sub.32, where x+y.ltoreq.12 and where x.gtoreq.1 and y.gtoreq.1, and optionally a MoO.sub.3 phase. A method for producing an arsenic-resistant composite oxide catalyst includes mixing vanadium oxide and molybdenum oxide or a precursor thereof with one another to form a mixture, heating the mixture to a temperature at which a mixture of oxides is present, preferably in completely molten form, then cooling down the mixture to form at least one composite oxide phase with a general formula V.sub.x Mo.sub.y O.sub.32, and then subjecting the composite oxide phase to a reducing treatment to prepare a lower-oxygen composite oxide phase with the same structure.

REFERENCES:
patent: 4851381 (1989-07-01), Hums
patent: 5112794 (1992-05-01), Hums et al.
patent: 5151256 (1992-09-01), Kato et al.
Surface Technology, 9 (1979), El-Salaam et al, pp. 195-202 "Studies on the Heterogeneous Oxidation of 1-Butene " (no month).

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