Purifying catalyst and method for purification of nitrogen oxides

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A catalyst (20) being formed of a porous supporter supporting alkali metals, Ti and noble metal, or further supporting at least one of rare earth metal and magnesium, being disposed in a flow passage of the internal combustion engine (7), and being used to purify NOx contained in the exhaust gas. The above catalyst (20) has excellent NOx resistance not only to the exhaust gas burnt with the stoichiometric air-to-fuel ratio or rich condition, but to the exhaust gas burnt with the lean condition, and furthermore has a high resistivity to poisoning of SOx slightly contained in the fuel.