The severe hazard of chlorinated volatile organic compounds (CVOCs) to human health and the natural environment makes their abatement technology a key topic of global environmental research. Due to the existence of Cl, the byproducts of CVOCs in the catalytic combustion process are complex and toxic, and the possible generation of dioxin becomes a potential risk to the environment. Well-qualified CVOC catalysts should process favorable low-temperature catalytic oxidation ability, excellent selectivity, and good resistance to poisoning, which are governed by the reasonable adjustment of acidity and redox properties. This review overviews the application of different types of multicomponent catalysts, that is, supported noble metal catalysts, transition metal oxide/zeolite catalysts, composite transition metal oxide catalysts, and acid-modified catalysts, for CVOC degradation from the perspective of balance between acidity and redox properties. This review also highlights the synergistic degradation of CVOCs and NOx from the perspective of acidity and redox properties. We expect this work to inspire and guide researchers from both the academic and industrial communities and help pave the way for breakthroughs in fundamental research and industrial applications in this field.

Recent Advances of Chlorinated Volatile Organic Compounds' Oxidation Catalyzed by Multiple Catalysts: Reasonable Adjustment of Acidity and Redox Properties.

Defect engineering over Co3O4 catalyst for surface lattice oxygen activation and boosted propane total oxidation

Amorphous and homogeneously Zr-doped MnOx with enhanced acid and redox properties for catalytic oxidation of 1,2-Dichloroethane

Effect of the acid site in the catalytic degradation of volatile organic compounds: A review

MoOx/CeO2 catalysts prepared by impregnation with (NH4)6H8Mo7O28 aqueous solution were applied for catalytic oxidation of 1,2-dichloroethane. MoOx exists on CeO2 fluorite as isolated (O=)2Mo(O-Ce)2, poly MoO4 and nano-particles, of which (O=)2Mo(O-Ce)2 presents high acidity and reducibility of Mo, and decreases the basicity of CeO2, leading to the formation of reactive intermediate during 1,2-dichloroethane adsorption. The activity of MoOx/CeO2 catalysts for 1,2-dichloroethane oxidation increases with acidity and surface oxygen from CeO2 domain. The catalyst with 2.6 Mo atom nm−2 presents the highest apparent activity with T90 of 280 °C in feed containing 1000/2000 ppm 1,2-dichloroethane at 60,000 h−1 space velocity. For chlorinated aromatic oxidation, similar high stable activity is observed. The ability of (O=)2Mo(O-Ce)2 for water dissociation promotes Cl removal, and thus, the chlorination is inhibited completely within experiment temperature. Mo6+=O of (O=)2Mo(O-Ce)2 is highly stable in wet feed, leading to high resistance of MoOx/CeO2 catalysts to water. 

Catalytic combustion of CVOCs over MoOx/CeO2 Catalysts

Catalytic combustion of CVOCs over CrxTi1-x oxide catalysts

Catalytic oxidation of chlorinated aromatics over Fe-based oxide catalysts modified by Mn

Ce-Ti-Zr mixed oxide catalysts prepared by sol-gel method were used in catalytic combustion of CH2Cl2. The characterization reveals that the incorporation of Ce and Zr into TiO2 anatase or Ti and Zr into CeO2 fluorite promotes hydroxyl groups, Lewis acidity and surface oxygen through the formation of Ti-O-Zr, Ti-O-Ce and Ce-O-Zr species. Ce-Ti-Zr catalysts show high activity for CH2Cl2 oxidation with the rate of 5.66 × 10−3–6.45 × 10−3 μmol s−1 m−2 at 250 °C and high stability for 50 h. The substitution of surface oxygen for Cl maintains the availability of Ti-OH and thus promotes Cl removal as HCl, which is verified by a great increase in the stable activity of physically closely contacted mixture of separated CeO2 and TiO2 or Ti9Zr1 particles. In situ FT-IR shows that CH2Cl2 interacts with Ti-OH to form -O-CH2-O-, which is quickly rearranged into formate. Finally, formate is oxidized with surface oxygen into CO or CO2.

CH2Cl2 catalytic oxidation over Ce-Ti-Zr mixed oxide catalysts

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Catalytic combustion of CVOCs over MoOx/CeO2 Catalysts

Catalytic combustion of CVOCs over CrxTi1-x oxide catalysts

Catalytic oxidation of chlorinated aromatics over Fe-based oxide catalysts modified by Mn

CH2Cl2 catalytic oxidation over Ce-Ti-Zr mixed oxide catalysts