Abstract
This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO2-based metal oxides at the temperatures of 20–150 °C. TiO2 and a series of TiO2-CeO2 were prepared by precipitation method and characterized by N2 adsorption, XRD, FT-IR, pyridine-IR, NH3-TPD and CO2-TPD. The characterization results showed that both the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO2-U precipitated by urea exhibited higher dechlorination capacity than TiO2-A precipitated by ammonia due to the higher surface area, 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 chlorine removal over Ti0.7Ce0.3O2 reached 82.8% after adsorption at 150 °C for 3 h. Mixing 5 wt% of alkali earth metal oxide into Ti0.7Ce0.3O2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti0.7Ce0.3O2-BaO reached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatography and GC-MS analysis revealed that organochlorine compound was converted into Cl− and its corresponding alcohol over the adsorbent at 150 °C. Finally, the mechanism of reactive adsorption dechlorination was proposed.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21905027), Beijing Education Committee Science and Technology Project (KM202010017007), and the Innovation and Entrepreneurship Training Program for College Students (No. 2021J00084).
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The authors declare that there are no known competing financial interests or personal relationships that could influence the work reported in this paper.
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Niu, H., Feng, Y., Ding, J. et al. Deep dechlorination of hydrocarbon oil by reactive adsorption on TiO2-based metal oxides. Korean J. Chem. Eng. 39, 1936–1945 (2022). https://doi.org/10.1007/s11814-022-1114-3
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DOI: https://doi.org/10.1007/s11814-022-1114-3