Catalyst for oxidation of metal mercury
View Patent ↗A catalyst is provided having higher mercury oxidation performance than a conventional catalyst without increasing catalyst quantity or enhancing SO 2 oxidation performance and constitutes an oxidation catalyst for metal mercury, which contains a molybdenum and vanadium complex oxide, for example, MoV 2 O 8 , as a main component having a catalytic activity and is formed by placing the molybdenum and vanadium complex oxide in layers only on the surface of a plate-like or honeycomb-like porous carrier. The porous carrier contains Ti and W and has a function of an NOx removal catalyst as a whole.
1. An oxidation catalyst for metal mercury used for oxidatively reacting metal mercury contained in exhaust gas with oxygen or a halogen compound, wherein a main component of the catalyst having a catalytic activity comprises a binary molybdenum and vanadium complex oxide, the molybdenum and vanadium complex oxide being carried in layers only on a surface of a plate-like or a honeycomb-like porous carrier.
2. The oxidation catalyst for metal mercury according to claim 1 , wherein the molybdenum and vanadium complex oxide comprises MoV 2 O 8 .
3. The oxidation catalyst for metal mercury according to claim 1 or 2 , wherein the molybdenum and vanadium complex oxide is diluted with a diluent comprising at least one element selected from silica, titania, alumina and zirconia.
4. The oxidation catalyst for metal mercury according to claim 3 , wherein a molar mixing ratio of the molybdenum and vanadium complex oxide relative to the diluent falls within the range of larger than 0 and 9 or less.
5. The oxidation catalyst for metal mercury according to claim 4 , wherein the porous carrier contains Ti and W.
6. A method of purifying exhaust gas comprising oxidizing metal mercury in exhaust gas by bringing the exhaust gas containing metal mercury into contact with the catalyst according to claim 4 .
7. The oxidation catalyst for metal mercury according to claim 3 , wherein the porous carrier contains Ti and W.
8. A method of purifying exhaust gas comprising oxidizing metal mercury in exhaust gas by bringing the exhaust gas containing metal mercury into contact with the catalyst according to claim 7 .
9. A method of purifying exhaust gas comprising oxidizing metal mercury in exhaust gas by bringing the exhaust gas containing metal mercury into contact with the catalyst according to claim 3 .
10. The oxidation catalyst for metal mercury according to any of claims 1 and 2 , wherein the porous carrier contains Ti and W.
11. A method of purifying exhaust gas comprising oxidizing metal mercury in exhaust gas by bringing the exhaust gas containing metal mercury into contact with the catalyst according to claim 10 .
12. A method of purifying exhaust gas comprising oxidizing metal mercury in exhaust gas by bringing the exhaust gas containing metal mercury into contact with the catalyst according to any of claims 1 and 2 .