Abstract
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•Cr/MnCo3Ox has high activity and excellent coking and chlorine resistance.•The formation of chlorinated by-products over Cr/MnCo3Ox is remarkably inhibited.•The superior stability of Cr/MnCo3Ox is due to the efficient Cl removal capacity.•1,2-dichloroethane destruction mechanism over prepared catalysts was proposed.
Catalyst chlorine poisoning is a critical issue to be solved for chlorine-containing VOCs decomposition. Herein, we found that three-dimensional nanosphere-like meso-macroporous MnCo3Ox (SMC-F) synthesized via a co-precipitation method has much higher activity and selectivity for 1,2-dichloroethane destruction than the bulk MnCo3Ox; however, polychlorinated by-products as 1,1,2-trichloroethane, trichloroethylene, perchloroethylene, trichloromethane and perchloromethane originated from the cleavage of CCl and CC bonds can be detected. As such, CrOx was further introduced to enhance the low temperature activity and selectivity of SMC-F. Results reveal that the incorporation of CrOx boosts surface lattice oxygen (O2−) amount and mobility and generates highly reducible Cr6+ and Mn4+ species in Cr/SMC-F, improving its activity and selectivity remarkably. Only 1,1,2-trichloroethane can be found during 1,2-dichloroethane destruction as the CC bond cleavage route is generally inhibited over Cr/SMC-F. The improved O2− mobility and oxidation property of Cr/SMC-F facilitate surface Cl desorption, ensuring its superior catalytic efficiency and chlorine resistance.