Arsenic-resistant catalyst and method for producing the same

Details Arsenic-resistant catalyst and method for producing the same Arsenic-resistant catalyst and method for producing the same

1992-07-30

1993-12-14

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Silicon containing or process of making

502309, 502312, B01J 2322, B01J 3716

Patent

active

052702774

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: 4925825 (1990-05-01), Tachi et al.
patent: 5112794 (1992-05-01), Hums et al.
El-Salaam et al., "Studies on the Heterogeneous Oxidation of 1-butene over V.sub.2 O.sub.5 -MoO.sub.3 Catalysts", Surface Technology, 9 (1979) 195-202.

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