DENITRATION CATALYST AND DENITRATION METHOD USING THE SAME

摘要

PURPOSE:To provide a denitration catalyst and to denitrate NOx in exhaust gas of an internal combustion engine of a lean air/fuel ratio with a high efficiency and high reliability by using the catalyst. CONSTITUTION:Activated alumina is used as a carrier and strontium or barium and silver and/or silver oxide are supported on the carrier to obtain the denitration catalyst. In this catalyst, the pore distribution in the activated alumina is characterized by that B is 30% or more of A and C is 15% or less of A when the sum total value of pore vol. occupied by pores with a pore radius of 300Angstrom or less is set to A and the sum total value of pore vol. occupied by pores with a pore radius of 50Angstrom or less is set to B and the sum total value of pore vol. occupied by pores with a pore radius of 100-300A is set to C in the relation between a pore radius and pore vol. measured by a nitrogen gas adsorbing method. When exhaust gas of an internal combustion engine operated in a lean air/fuel ratio passes through the denitration catalyst bed, the inlet temp. of the catalyst bed is set to 400-600V.