Structure-selectivity relevance of multiple-component catalysts for CVOCs’ complete oxidation: State-of-the-art and perspectives

Abstract

Chlorinated volatile organic compounds (CVOCs) have been of great concern as one of the priority atmospheric hazards, which pose serious threat to both human health and environmental quality. Unlike conventional VOCs, the particularity of Cl substitution drastically leads to the generation of chlorinated by-products (especially polychlorinated composites) with higher toxicity and deactivation of catalysts’ active components during CVOCs’ catalytic oxidation. To achieve superior selectivity and remarkable Cl-resistance, rational structure regulation of multiple-component catalysts should be developed. In this review, various by-product transformation is systematically overviewed to figure out the comprehensive behavior mechanisms of CVOCs and formed intermediates, including both the inorganics (CO, CO2, Cl2, and HCl) and organics (chloroalkanes, chlorinated olefins, and chlorinated aromatics). Moreover, we shed light on the feasible strategies of support modification and core-shell structure construction from the perspective of the tight relevance between catalyst structure and selectivity in CVOCs’ destruction. Additionally, the possibility and methods of catalyst regeneration are discussed as well. We expect this work to inspire and help researchers pave the way for further breakthroughs in both academic and industrial communities.