| abstract |
Wherein the ratio of the pore volume in the pore size range from 500 Å to 3000 Å with respect to the total pore volume is 15% or more and 40% or less in the pore volume distribution in the pore size range of 10 5 Å or less, Particularly a low NOx combustion exhaust gas, in which the ratio of the pore volume in the pore size range of 1000 Å or more is 10% or more and 45% or less, the silica is not deposited well and the denitrification performance is hardly deteriorated even if the amount of deposited silica is increased. Gt; NOx < / RTI > A method for removing NOx by contacting a low NOx combustion exhaust gas with the catalyst in the presence of ammonia or an ammonia precursor is also provided. |