69.次世代アンモニア脱硝触媒の開発(石炭利用における科学と工学の融合)

概要

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In order to develop a catalyst for low temperature selective reduction of NO in coal combustion flue gas in presence of ammonia, TiO_2, ZrO_2, and Al_2O_3 catalysts were studied in a continuous quartz fixed-bed reaction system. It was observed that TiO_2, ZrO_2, and Al_2O_3 had DeNOx activity at about 90℃. Their activities were influenced by reaction temperature, water vapor, sulfurous acid, and ammonia gas. This selective catalytic removal of NO did not occur without SO_2. The selectivities of NO to N_2 over the oxides were in the order: ZrO_2>TiO_2>Al_2O_3. The activities of these three catalysts decayed with the elapsed reaction time since the accumulation of the ammonium salts plugged the pores of the catalysts. It was also concluded that the used catalysts could be regenerated by water washing. The mechanism of the SCR (Selective catalytic reduction) was also studied using TPD technique. From the study, it was supposed that this reaction occurred via NH_4NO_2 or a similar compound.
一般社団法人日本エネルギー学会の論文
1999-10-28