Layered ammonia oxidation catalyst
AssigneeBASF Catalysts LLC
InventorsPascaline Harrison Tran, James Mon-Her Chen, Gerard Diomede Lapadula, Marc Thomas Blute
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Abstract
The invention pertains to a layered ammonia oxidation catalyst. The layered catalyst causes ammonia to be selectively oxidized in the presence of an oxidant such as air, while minimizing the formation of nitrogen oxides (NOx). The layered catalyst comprises a refractory oxide support such as gamma alumina upon which a platinum component is deposited and a vanadia component is deposited on the platinum. The catalyst is preferably disposed on a substrate such as a metal foil whose surface contains a “herringbone” pattern.
Claims20
A layered ammonia oxidation catalyst comprising a refractory metal oxide, a layer of platinum disposed upon the refractory metal oxide and a layer of vanadia disposed upon the platinum, wherein said vanadia is present in the amount of about 13 to about 104 g/ft3.
A method for preparing an ammonia oxidation catalyst that comprises the steps of:
- (a) depositing a refractory metal oxide upon the surface of a substrate;
- (b) depositing a platinum component upon the surface of the substrate resulting from step (a);
- (c) drying and thereafter calcining the substrate resulting from step (b) at a temperature of about 300 to about 700° C.;
- (d) depositing a vanadium component upon the surface of the substrate resulting from step (c);
- and
- (e) drying and thereafter calcining the substrate resulting from step (d) at a temperature of about 300 to about 700° C. so as to form vanadia, wherein said vanadia is present in the amount of about 13 to about 104 g/ft3.
A process for selectively oxidizing ammonia present in an exhaust gas stream to nitrogen which comprises contacting the exhaust gas stream with a layered ammonia oxidation catalyst in the presence of an oxidant at a temperature of about 200 to about 375° C., said layered ammonia oxidation catalyst comprising a refractory metal oxide, a layer of platinum disposed upon the refractory metal oxide and a layer of vanadia disposed upon the platinum, wherein said vanadia is present in the amount of about 13 to about 104 g/ft3.
Dependencies are inferred from the claim text.