Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c03336
Keywords
titanium dioxide; Ru-based catalyst; heteropoly acid; 1, 2-dichloroethane oxidation; toluene oxidation; water resistance
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Funding
- National Natural Science Committee of China - Liaoning Provincial People?s Govern-ment Joint Fund [U1908204]
- National Natural Science Foundation of China [21876006, 21976009]
- Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions [IDHT20190503]
- Natural Science Foundation of Beijing Municipal Commission of Education [KM201710005004]
- Development Program for the Youth Outstanding - Notch Talent of Beijing Municipal Commission of Education [CITTCD201904019]
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This study compared the oxidation of 1,2-dichloroethane and a mixture of 1,2-dichloroethane and toluene using different catalysts. The results showed that HPW modification successfully enhanced the oxidation activity of 1,2-dichloroethane but led to excessive adsorption of toluene, inhibiting the degradation of 1,2-dichloroethane. Compared to Brionsted acid modification, catalysts with oxygen vacancies are more suitable for the oxidation of multicomponent VOCs.
The compositions of volatile organic compounds (VOCs) under actual industrial conditions are often complex; especially, the interaction of intermediate products easily leads to more toxic emissions that are harmful to the atmospheric environment and human health. Herein, we report a comparative investigation on 1,2-dichloroethane (1,2-DCE) and (1,2-DCE + toluene) oxidation over the Ru/TiO2, phosphotungstic acid (HPW)-modified Ru/TiO2, and oxygen vacancy-rich Ru/TiOx catalysts. The doping of HPW successfully introduced the 1,2-DCE adsorption sites to promote its oxidation and exhibited outstanding water resistance. For the mixed VOCs, Ru/HPW-TiO2 promoted the preferential and superfluous adsorption of toluene and resulted in the inhibition of 1,2-DCE degradation. Therefore, HPW modification is a successful strategy in catalytic 1,2-DCE oxidation, but Brionsted acid sites tend to adsorb toluene in the mixed VOC oxidation. The Ru/TiOx catalyst exhibited excellent activity and stability in the oxidation of mixed VOCs and could inhibit the generation of byproducts and Cl-2 compared with the Ru/HPW-TiO2 catalyst. Compared with the Brionsted acid modification, the oxygen vacancy-rich catalysts are significantly suitable for the oxidation of multicomponent VOCs.
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