Denitration catalyst and method for purifying exhaust gas
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsShimpei Kaneda, Keiichiro Kai
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Abstract
A method for purifying combustion exhaust gas, comprising: placing a denitration catalyst in gas stream to remove nitrogen oxides from a combustion exhaust gas, wherein the denitration catalyst comprises a shaped product comprising a catalyst component and having microcracks on the surface of the shaped-product, and 80% to 100% of the microcracks on the number basis have an angle of a longitudinal direction of the microcracks with respect to a main direction of the gas stream within ±30 degrees.
Claims7
A method for purifying combustion exhaust gas by using denitration catalyst,
- the denitration catalyst comprising:
- a shaped product comprising a catalyst component supported on a substrate;
- wherein the substrate is denitration composed of expanded metal having mesh the shaped product is a plate shaped product including the catalyst component supported on the substrate so that the catalyst component fills the mesh;
- wherein a plurality of microcracks, each of which has a 95% crack width of not more than 100 μm, are formed on the surface of the shaped product,
- the method comprising:
- placing the denitration catalyst in a stream of the combustion exhaust gas to remove nitrogen oxides from the combustion exhaust gas, such that an angle between an extending direction of the microcrack and a stream direction of the combustion exhaust gas for 80-100% of the plurality of microcracks is within ±30 degrees.
A denitration catalyst for purifying combustion exhaust gas, comprising;
- a shaped product and comprising a catalyst component supported on a substrate;
- wherein the substrate is denitration composed of expanded metal having mesh the shaped product is a plate shaped product including the catalyst component supported on the substrate so that the catalyst component fills the mesh;
- wherein a plurality of microcracks, each of which has a 95% crack width of not more than 100 μm, are formed on the surface of the shaped product,
- wherein the shaped product has a wall portion configured to form a macro flow channel through which the combustion exhaust gas flows, and
- wherein denitration catalyst is provided in the macro flow channel such that an angle between an extending direction of the microcrack and a stream direction of the combustion exhaust gas for 80-100% of the plurality of microcracks is within ±30 degrees.
Dependencies are inferred from the claim text.