An isotopic strategy to investigate the role of water vapor in the oxidation of 1,2-dichloroethane over the Ru/WO3 or Ru/TiO2 catalyst

Enhanced Water Resistance and Catalytic Performance of Ru/TiO2 by Regulating Brønsted Acid and Oxygen Vacancy for the Oxidative Removal of 1,2-Dichloroethane and Toluene

“…Water vapor (5.0 vol %) was used to investigate the water resistance of Ru/TiO 2 and Ru/HPW-TiO 2 for 1,2-DCE or (1,2-DCE + toluene) oxidation, as shown in Figure A–F. Just as the results of previous studies, 1,2-DCE conversion at 320 °C was decreased by about 10% and showed a gradual decline after cutting off H 2 O over Ru/TiO 2 at 240 °C (Figure A,D), which was a result due to the fact that the strong hydrophilicity leads to the competitive adsorption between water and 1,2-DCE. Dramatically, 1,2-DCE conversion was improved by about 10% after the introduction of water vapor over Ru/HPW-TiO 2 at 240 or 320 °C.…”

“…Obviously, such a promotional effect was more significant over the Ru/HPW-TiO 2 catalyst (Figure G). Besides, based on the reaction temperatures, we speculate that water vapor is identified as an active species since it first favors the transformation of toluene and then promotes the degradation of 1,2-DCE due to the exposure of sufficient active sites. It is worth noting that cutting off the water vapor provision exerts different effects on the two catalysts.…”

“…In the previous studies, we observed that water could enhance the activity of the Ru/WO 3 or Ru/TiO 2 catalyst due to the formation of hydroxyl radicals from water. We also found that the Ru/WO 3 catalyst possessed more abundant and active hydroxyl sites (W-OH) than the Ru/TiO 2 catalyst, and W-OH was conducive to the adsorption and reaction of 1,2-dichloroethane molecules.…”

Selective Ru Adsorption on SnO2/CeO2 Mixed Oxides for Efficient Destruction of Multicomponent Volatile Organic Compounds: From Laboratory to Practical Possibility

“…The dissociated Cl is inclined to attack active centers, which causes catalyst deactivation and induces electrophilic chlorination forming toxic polychlorinated byproducts, particularly dioxins . Accordingly, recent efforts for the catalytic combustion of Cl–VOCs have been devoted to designing efficient catalysts with less secondary pollution and more reliable stability. − However, considering that the vast majority of industrial waste gases usually involve multicomponent VOCs with only trace amounts of Cl–VOCs, developments of versatile catalysts that can sustain Cl attacks and adapt to a wide range of VOCs’ destruction are highly demanded. , …”

“…These toxic byproducts are formed mainly via electrophilic chlorination owing to the inefficient removal of dissociated Cl from Lewis acidic centers . Therefore, further modifications are conducted to sweep the Cl species timely from the catalyst surface, and Brønsted PO 4 3– , H-zeolite, WO 3 , MoO 3 , and VO x have been extensively employed as the dechlorination center in many state-of-the-art catalysts. ,,− ,− However, introduction of the Brønsted acid sites can inevitably decline the catalyst oxidation ability, and their hydrophilic characteristic is inclined to suppress the H 2 O resistance for modified catalysts. , …”