CaO-Promoted Lattice Oxygen Activation and Antichlorine Poisoning over Mullite for Catalytic Chlorobenzene Combustion

作者：Liu, Yi; Wang, Fanyu; Xie, Fei; Zheng, Jiamin; Lan, Jintong; Guo, Furong; Sun, Yifei^*; Zhang, Lizhi; Liu, Xiao^*

来源：ACS Catalysis, 2023, 13(15): 10340-10350.

DOI：10.1021/acscatal.3c01871

• SmMn2O5
• CaO-assisted strategy
• anti-Cl poisoning
• lattice oxygen activation
• catalytic chlorobenzene combustion

The degradation of chlorine-containingvolatile organiccompounds(Cl-VOCs) utilizing catalytic combustion technology is subjectto the paradox of toxic byproduct formation and catalyst chlorinepoisoning. Herein, a CaO-assisted strategy is proposed to resolvethe awkward stuff for improving the catalytic combustion performanceof chlorobenzene on SmMn2O5. The CaO-collaboratedSmMn(2)O(5) exhibits a significant decrease in T (90) by 142 and 125 & DEG;C compared with unmodifiedand inert SiO2-composited SmMn2O5, respectively. The integrated characterization results confirm thatCaO collaboration causes electron transfer from CaO to SmMn2O5, resulting in a reduction of the orbital overlap betweenMn and O atoms to activate lattice oxygen (O-latt). Theactivated O-latt enables chlorobenzene to combust completelyat a lower temperature of 275 & DEG;C at which toxic byproducts arenot generated. Furthermore, the switching of the dechlorination sitefrom SmMn2O5 to CaO avoids chlorine poisoningof active sites on SmMn2O5 and thus endows CaO-collaboratedSmMn(2)O(5) with prominent stability.

• 单位
  上海交通大学; 北京航空航天大学