초록 ▼

A process for removing nitrogen oxides from exhaust gases containing volatile metal compounds with good efficiency by contacting the gases with a catalyst comprising TiO2, difficulty reduced by the compounds, in the presence of ammonia, and such a catalyst are provided, which process is characterize

A process for removing nitrogen oxides from exhaust gases containing volatile metal compounds with good efficiency by contacting the gases with a catalyst comprising TiO2, difficulty reduced by the compounds, in the presence of ammonia, and such a catalyst are provided, which process is characterized in that the average pore diameter of the TiO2 is 10,000 Åor less and the proportion of the volume of pores having pore diameters of 400-5,000 Åto the total pore volume is 50% or more; a denitration-active component is supported on the TiO2; a catalyst carrier precursor comprising an aqueous slurry sol of TiO2 or Ti hydroxide prepared by hydrolyzing a Ti salt is precalcined at 150°-700°C., followed by adding a denitration-active component and then normally calcining the mixture; and a polymer compound having a thermal decomposition temperature of 110°to 300°C. is added in 1-20% by weight to the catalyst carrier precursor, followed by precalcining the mixture at the thermal decomposition temperature or higher.

대표청구항 ▼

A process for removing nitrogen oxides from an exhaust gas, comprising the step of: contacting an exhaust gas containing the nitrogen oxides in the presence of ammonia with an effective amount of a denitrating catalyst which includes titanium oxide, wherein said exhaust gas contains volatile metal c

A process for removing nitrogen oxides from an exhaust gas, comprising the step of: contacting an exhaust gas containing the nitrogen oxides in the presence of ammonia with an effective amount of a denitrating catalyst which includes titanium oxide, wherein said exhaust gas contains volatile metal compounds; the average pore diameter of said titanium oxide is 10,000 Åor less; and the proportion of the volume of pores having pore diameters of 400 to 5,000 Åto the total pore volume is 50% or more.