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Insight into the promotional mechanism of Cu modification towards wide-temperature NH3-SCR performance of nbce catalyst

引用

Chinese Journal of Chemical Engineering 2022年第10期50卷 301-309页

作者： Dongqi An Yuyao Yang Weixin Zou Yandi Cai Qing Tong Jingfang Sun Lin Dong Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering and Jiangsu Key Laboratory of Vehicle Emissions ControlNanjing UniversityNanjing 210093China Center for Nanochemistry College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Jiangsu Key Laboratory of Vehicle Emissions Control School of EnvironmentNanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Vehicle Emissions Control Center of Modern AnalysisNanjing UniversityNanjing 210093China Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering and Jiangsu Key Laboratory of Vehicle Emissions ControlSchool of EnvironmentCenter of Modern AnalysisNanjing UniversityNanjing 210093China

A simple strategy of Cu modification was proposed to broaden the operation temperature window for nbce *** best catalyst Cu0.010/Nb1Ce3 presented over 90%NO conversion in a wide temperature range of 200-400℃and exhibited an excellent H_(2)O or/and SO_(2) resistance at 275℃.To understand the promotional mechanism of Cu modification,the correlation among the"activity-structure-property"were tried to establish *** species highly dispersed on nbce catalyst to serve as the active *** strong interaction among Cu,Nb and Ce promoted the emergence of NbO4 and induced more Bronsted acid *** Cu modification obviously enhanced the redox behavior of the nbce ***,EPR probed the Cu species exited in the form of monomeric and dimeric Cu^(2+),the isolated Cu^(2+)acted as catalytic active sites to promote the reaction:Cu^(2+)-NO_(3)^(-)+NO(g)→Cu^(2+)-NO_(2)^(-)+NO_(2)(g).Then the generated NO_(2) would accelerate the fast-SCR reaction process and thus facilitated the lowtemperature deNO_(x) ***,surface nitrates became unstable and easy to decompose after Cu modification,thus providing additional adsorption and activation sites for NH3,and ensuring the improvement of catalytic activity at high *** the NH3-SCR reaction followed by E-R reaction pathway efficaciously over Cu_(0.010)/Nb_(1)Ce_(3) catalyst,the excellent H_(2)O and SO_(2) resistance was as expected.

关键词： NH_(3)-SCR nbce catalyst Cu modification NO_(2)promoting effect Fast-SCR Flue gas

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