Rationally Engineered CuSO₄/TiO₂ with Cl Desorption and Intermediate Rapid Oxidation Dual-Reaction Channels for...

Area of Science:

• Environmental Chemistry
• Catalysis
• Materials Science

Background:

• Chlorinated volatile organic compounds (CVOCs) pose environmental risks.
• Suppressing toxic polychlorinated byproducts during CVOC destruction is challenging.
• Effective CVOC destruction requires managing chlorine species and intermediates.

Purpose of the Study:

• To develop a catalyst for efficient 1,2-dichloroethane (1,2-DCE) oxidation.
• To prevent the formation of toxic polychlorinated byproducts.
• To understand the mechanism of chlorine desorption and intermediate oxidation.

Main Methods:

• Synthesis of a CuSO4/TiO2 catalyst with dual-reaction channels.
• Characterization of catalyst properties, including S═O-H and Cu-O-S sites.
• Evaluation of catalytic activity for 1,2-DCE oxidation at 251 °C.
• Analysis of reaction pathways and byproduct formation.

Main Results:

• The CuSO4/TiO2 catalyst achieved 90% conversion of 1,2-DCE at 251 °C.
• Reaction rates were 8.3 and 11.0 times higher than SO4(2-)/TiO2 and CuO/TiO2, respectively.
• The catalyst effectively suppressed the formation of various polychlorinated byproducts.
• Enhanced electron transfer (O → Cu) accelerated 1,2-DCE oxidation.

Conclusions:

• The developed catalyst offers a highly efficient solution for CVOC purification.
• Matching chlorine desorption with intermediate oxidation is crucial for preventing byproduct formation.
• The catalyst's dual-reaction channels facilitate both Cl desorption and deep oxidation.
• This study provides insights into designing catalysts for effective CVOC remediation.