Recent advances in chlorinated volatile organic compounds’ oxidation over multiple noble metal catalysts: A review based on rational manipulation of redox-acidity balance

Abstract

Chlorinated volatile organic compounds (CVOCs) elimination has become a priority topic in global environmental research because of the serious threats to human health and natural environment. Due to the particularity of CVOCs, Cl-substitution drastically leads to byproduct formation with higher toxicity and catalyst deactivation during catalytic oxidation process. To address the issues, well-qualified catalysts with outstanding activity, remarkable selectivity, and notable Cl resistance should be developed by reasonable regulation of redox-acidity. In addition to fascinating activity, noble metals markedly break through their susceptibility to Cl-poisoning by integrating with other components. This review sheds light on feasible strategies designing applicable catalysts to facilitate CVOCs degradation based on rational manipulation of redox-acidity balance, that is, synergistic interaction of multi-components and multi-level structure controlling. Simultaneously, typical implementation performances of multiple noble metal catalysts in CVOCs abatement are also highlighted. Finally, an outlook on new trends and ongoing challenges in CVOCs catalysis over noble metals is given. We expect that this work will provide marked reference and guidance for future development of multiple catalyst fabrication in both the academic and industrial communities.