Importance

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Abstract

In light of the fact that a catalyst of the prior art rapidly deteriorates in an exhaust gas of biomass combustion, the present invention realizes a NO_X reduction catalyst which is less likely to be deteriorated even if used in a treatment of an exhaust gas containing a high concentration of potassium component in a combustion ash, like an exhaust gas of biomass combustion, and provides a method for reduction of NO_X in an exhaust gas of biomass combustion with high efficiency for a long period using the catalyst. A catalyst for purification of an exhaust gas, in which the catalyst is obtained by bringing titanium oxide into contact with phosphoric acid or a phosphoric acid ammonium salt in an amount of more than 1% by weight and not more than 15% by weight, in terms of H₃PO₄, with respect to the titanium oxide in the presence of water thereby to cause adsorption of phosphoric acid ions on a surface, and then supporting more than 0% by atom and not more than 8% by atom of an oxo-acid of molybdenum (Mo) and/or tungsten (W) or an oxo-acid salt of molybdenum (Mo) and/or tungsten (W), and an oxo-acid salt of vanadium (V) or a vanadyl salt on the titanium oxide.

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First Claim