SCR catalyst device containing vanadium oxide and molecular sieve containing iron
AssigneeUmicore AG & Co. KG
InventorsStephan Malmberg, Nicola Soeger
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Abstract
The invention relates to a catalyst device for purifying exhaust gases containing nitrogen oxide by means of selective catalytic reduction (SCR), comprising at least two catalytic regions, the first region containing vanadium oxide and cerium oxide, and the second region containing a molecular sieve containing iron. The invention also relates to uses, the catalyst device and methods for purifying exhaust gases.
Claims20
A catalyst device for purifying exhaust gases containing nitrogen oxide by means of selective catalytic reduction (SCR), comprising at least two catalytic regions, the first region comprises the following components:
- (a) from 0.5 to 10% by weight vanadium oxide, calculated as V2O5,
- (b) from 0.2 to 10% by weight cerium oxide, calculated as CeO2,
- (c) from 0 to 17% by weight tungsten oxide, calculated as WO3,
- (d) from 25 to 98% by weight titanium oxide, calculated as TiO2,
- (e) from 0 to 15% by weight silicon oxide, calculated as SiO2,
- (f) from 0 to 15% by weight aluminum oxide, calculated as Al2O3
- and in each case based on the weight of the first region, and
- the second region containing a molecular sieve containing iron.
Dependencies are inferred from the claim text.