CaO-Promoted Lattice Oxygen Activation and Antichlorine Poisoning over Mullite for Catalytic Chlorobenzene Combustion
Liu Yi, Fanyu Wang, Fei Xie, Jiamin Zheng, Jintong Lan, Furong Guo, Yifei Sun, Lizhi Zhang, Xiao Liu
Abstract
The degradation of chlorine-containing volatile organic compounds (Cl–VOCs) utilizing catalytic combustion technology is subject to the paradox of toxic byproduct formation and catalyst chlorine poisoning. Herein, a CaO-assisted strategy is proposed to resolve the awkward stuff for improving the catalytic combustion performance of chlorobenzene on SmMn 2 O 5 . The CaO-collaborated SmMn 2 O 5 exhibits a significant decrease in T 90 by 142 and 125 °C compared with unmodified and inert SiO 2 -composited SmMn 2 O 5, respectively. The integrated characterization results confirm that CaO collaboration causes electron transfer from CaO to SmMn 2 O 5, resulting in a reduction of the orbital overlap between Mn and O atoms to activate lattice oxygen (O latt ). The activated O latt enables chlorobenzene to combust completely at a lower temperature of 275 °C at which toxic byproducts are not generated. Furthermore, the switching of the dechlorination site from SmMn 2 O 5 to CaO avoids chlorine poisoning of active sites on SmMn 2 O 5 and thus endows CaO-collaborated SmMn 2 O 5 with prominent stability.