The fluid catalytic cracking(FCC) is the principal gasoline producing process in the refinery. Considerable amounts of harmful sulfur oxides and nitrogen oxides (SO x and NO x) are generated with the FCC operatio...The fluid catalytic cracking(FCC) is the principal gasoline producing process in the refinery. Considerable amounts of harmful sulfur oxides and nitrogen oxides (SO x and NO x) are generated with the FCC operation. Impacted by strengthening environmental regulations and the current global emphasis on environmental protection and pollution abatement, refiners have been meaning to look for effective ways to control and reduce SO x and NO x emissions. FCC DeSO x and DeNO x additives is the most promising measure. The present paper reviews the developments in FCC DeSO x and DeNO x additive technology based on the respective authors' works, the future directions of the technology are also discussed.展开更多
TiO2,CoS and SnO2 respectively by itself is inactive for the reduction of SO2 or/and NO by CO;however,we discovered that both TiO2- CoS （1:1 mass ratio） and TiO2- SnO2 （1:1 mass ratio） composite compounds are very...TiO2,CoS and SnO2 respectively by itself is inactive for the reduction of SO2 or/and NO by CO;however,we discovered that both TiO2- CoS （1:1 mass ratio） and TiO2- SnO2 （1:1 mass ratio） composite compounds are very active for such reactions,at 300－ 350℃ ,the conversion of SO2 to S,NO to N2 are over 90％ ,and the selectivity towards S or N2 are over 95％ .These mean that there are synergism effects between TiO2 and CoS,TiO2 and SnO2.It was confirmed by XRD characterization that TiO2 and CoO,TiO2 and SnO2 transform to rutile after calcinations at 500℃ ,however,individual TiO2（anatase） can only transform to rutile up to 900℃ .Therefore ,it is suggested that the synergism effects must be related to these composites comcound which exist as rutile structure.The study of the reaction mechanism and model of active phase are underway.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The fluid catalytic cracking(FCC) is the principal gasoline producing process in the refinery. Considerable amounts of harmful sulfur oxides and nitrogen oxides (SO x and NO x) are generated with the FCC operation. Impacted by strengthening environmental regulations and the current global emphasis on environmental protection and pollution abatement, refiners have been meaning to look for effective ways to control and reduce SO x and NO x emissions. FCC DeSO x and DeNO x additives is the most promising measure. The present paper reviews the developments in FCC DeSO x and DeNO x additive technology based on the respective authors' works, the future directions of the technology are also discussed.
文摘TiO2,CoS and SnO2 respectively by itself is inactive for the reduction of SO2 or/and NO by CO;however,we discovered that both TiO2- CoS （1:1 mass ratio） and TiO2- SnO2 （1:1 mass ratio） composite compounds are very active for such reactions,at 300－ 350℃ ,the conversion of SO2 to S,NO to N2 are over 90％ ,and the selectivity towards S or N2 are over 95％ .These mean that there are synergism effects between TiO2 and CoS,TiO2 and SnO2.It was confirmed by XRD characterization that TiO2 and CoO,TiO2 and SnO2 transform to rutile after calcinations at 500℃ ,however,individual TiO2（anatase） can only transform to rutile up to 900℃ .Therefore ,it is suggested that the synergism effects must be related to these composites comcound which exist as rutile structure.The study of the reaction mechanism and model of active phase are underway.
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.
