A plasma-assisted catalytic reactor was used to remove nitrogen oxides (NOx)from diesel engine exhaust operated under different load conditions. Initial studies were focused onplasma reactor (a dielectric barrier disc...A plasma-assisted catalytic reactor was used to remove nitrogen oxides (NOx)from diesel engine exhaust operated under different load conditions. Initial studies were focused onplasma reactor (a dielectric barrier discharge reactor) treatment of diesel exhaust at varioustemperatures. The nitric oxide (NO) removal efficiency was lowered when high temperature exhaust wastreated using plasma reactor. Also, NO removal efficiency decreased when 45% load exhaust wastreated. Studies were then made with plasma reactor combined with a catalytic reactor consisting ofa selective catalytic reduction (SCR) catalyst, V_2O_5/TiO_2. Ammonia was used as a reducing agentfor SCR process in a ratio of 1:1 to NOx. The studies were focused on temperatures of the SCRcatalytic reactor below 200℃. The plasma-assisted catalytic reactor was operated well to remove NOxunder no-load and load conditions. For an energy input of 96 J/l, the NOx removal efficienciesobtained under no-load and load conditions were 90% and 72% respectively at an exhaust temperatureof 100 ℃.展开更多
CeCucontaining catalyst (CeCuMgAl(O)) was prepared by coprecipitation whose catalytic activity for NO+CO in the presence of oxygen was examined and compared with the catalyst free of cerium.The effect of H 2O on the c...CeCucontaining catalyst (CeCuMgAl(O)) was prepared by coprecipitation whose catalytic activity for NO+CO in the presence of oxygen was examined and compared with the catalyst free of cerium.The effect of H 2O on the catalytic activity was also investigated.The results show that for NO+CO reaction in the presence of oxygen,the activitytemperaturewindow of CeCuMgAl(O) shifts to lower temperature than that of CuMgAl(O).The presence of H 2O gives rise to the significant changes of catalytic activity of these two catalysts in low temperature region:great reducing for CuMgAl(O) and intensive increase for CuCeMgAl(O) whereas no obvious effect in high temperature region.The synergy between CuCe oxides and thus much more Cu+ exist in the CeCuMgAl(O) than CuMgAl(O) are responsible for these differences.展开更多
文摘A plasma-assisted catalytic reactor was used to remove nitrogen oxides (NOx)from diesel engine exhaust operated under different load conditions. Initial studies were focused onplasma reactor (a dielectric barrier discharge reactor) treatment of diesel exhaust at varioustemperatures. The nitric oxide (NO) removal efficiency was lowered when high temperature exhaust wastreated using plasma reactor. Also, NO removal efficiency decreased when 45% load exhaust wastreated. Studies were then made with plasma reactor combined with a catalytic reactor consisting ofa selective catalytic reduction (SCR) catalyst, V_2O_5/TiO_2. Ammonia was used as a reducing agentfor SCR process in a ratio of 1:1 to NOx. The studies were focused on temperatures of the SCRcatalytic reactor below 200℃. The plasma-assisted catalytic reactor was operated well to remove NOxunder no-load and load conditions. For an energy input of 96 J/l, the NOx removal efficienciesobtained under no-load and load conditions were 90% and 72% respectively at an exhaust temperatureof 100 ℃.
文摘CeCucontaining catalyst (CeCuMgAl(O)) was prepared by coprecipitation whose catalytic activity for NO+CO in the presence of oxygen was examined and compared with the catalyst free of cerium.The effect of H 2O on the catalytic activity was also investigated.The results show that for NO+CO reaction in the presence of oxygen,the activitytemperaturewindow of CeCuMgAl(O) shifts to lower temperature than that of CuMgAl(O).The presence of H 2O gives rise to the significant changes of catalytic activity of these two catalysts in low temperature region:great reducing for CuMgAl(O) and intensive increase for CuCeMgAl(O) whereas no obvious effect in high temperature region.The synergy between CuCe oxides and thus much more Cu+ exist in the CeCuMgAl(O) than CuMgAl(O) are responsible for these differences.
