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        Deep desulfurization of model oil by photocatalytic air oxidation and adsorption using Ti(1−x)MxO2 (M=Zr, Ce)

        Wei Zhang,Xin Li,Hong Wang,송영지,Shenghong Zhang,Cuiqing Li 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.12

        Deep desulfurization of model oil by photocatalytic air oxidation and adsorption using Ti(1−x)MxO2 (M=Zr, Ce) was investigated. Ti(1−x)MxO2 (M=Zr, Ce) was prepared by urea gelation/co-precipitation method, and characterized by N2 adsorption, XRD and UV-vis spectra. UV irradiation greatly enhanced the adsorptive capacity and selectivity of TiO2-ZrO2 for organosulfur in model oil because organosulfur compounds were first photocatalytically oxidized to sulfoxides and sulfones over TiO2-ZrO2, which were then selectively adsorbed on the bifunctional material due to much higher polarities of generated sulfoxides and sulfones. The Ti/Zr molar ratio and calcination temperature were optimized to 5 : 5 and 500 oC with the sulfur removal of 99.6% after reaction for 2 h under UV irradiation. After adding 25 wt% toluene into model oil, the sulfur removal could still reach 97.2% after reaction for 7 h. TiO2-ZrO2 could be well regenrated by washing with acetonitrile followed by thermal treatment in air.

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        Deep dechlorination of hydrocarbon oil by reactive adsorption on TiO2-based metal oxides

        Hui Niu,Yuyu Feng,Jie Ding,Wei Zhang,Chenxing Hu,Qingxiang Zhang,Chen Zhang,Cuiqing Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

        This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO2-based metal oxides atthe temperatures of 20-150 oC. TiO2 and a series of TiO2-CeO2 were prepared by precipitation method and characterizedby N2 adsorption, XRD, FT-IR, pyridine-IR, NH3-TPD and CO2-TPD. The characterization results showed thatboth the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO2-U precipitatedby urea exhibited higher dechlorination capacity than TiO2-A precipitated by ammonia due to the higher surfacearea, more acid and base amounts of the former. Among various Ti(1x)CexO2 (x=0.1, 0.3, 0.5, 0.7, 0.9, 1) oxides,Ti0.7Ce0.3O2 and Ti0.3Ce0.7O2 bimetallic oxides showed higher dechlorination capacity than TiO2-U, and the chlorineremoval over Ti0.7Ce0.3O2 reached 82.8% after adsorption at 150 oC for 3 h. Mixing 5 wt% of alkali earth metal oxideinto Ti0.7Ce0.3O2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti0.7Ce0.3O2-BaOreached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatographyand GC-MS analysis revealed that organochlorine compound was converted into Cl and its corresponding alcoholover the adsorbent at 150 oC. Finally, the mechanism of reactive adsorption dechlorination was proposed.

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