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<p>A series of zinc-aluminium binary adsorbents with different Zn/Al ratio were prepared by hydrothermal synthesis and their performance in removing 1-chlorooctane from model oils by adsorption reaction under the temperature range 30&#xa0;°C–180&#xa0;°C was investigated. The physicochemical properties of the adsorbents were analyzed by XRD, SEM, FT-IR, Pyridine-IR, N<sub>2</sub> adsorption, NH<sub>3</sub>-TPD, liquid infrared and ion chromatography. The results showed that a large number of hydroxyl groups (or adsorbed H<sub>2</sub>O) existed on the surface of the adsorbent and its surface acid was mainly Lewis acid, and the Zn/Al ratio affected the morphology, specific surface area and acid content of the adsorbent. The sample ZnAl-LDO-2 with Zn/Al ratio of 2:1 exhibited the best dechlorination and regeneration performance. The increase of Lewis acid amount and the relatively higher hydroxyl groups and specific surface area were confirmed to be responsible for excellent dechlorination performance of ZnAl-LDO-2. Under reaction temperatures 150&#xa0;°C, the organochlorine was converted into Cl<sup>−</sup> and the corresponding alcohol on the adsorbent. Based on the above analysis, a reaction mechanism for adsorption-based dechlorination was proposed.</p> Graphical Abstract <p></p>

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Study on Deep Dechlorination and Reaction Mechanism of Oil on Zn–Al Layered Bimetallic Oxides

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Qing Sun,
  • Bingtian Huang,
  • Liancheng Bing,
  • Dezhi Han,
  • Guangjian Wang,
  • Fang Wang

摘要

A series of zinc-aluminium binary adsorbents with different Zn/Al ratio were prepared by hydrothermal synthesis and their performance in removing 1-chlorooctane from model oils by adsorption reaction under the temperature range 30 °C–180 °C was investigated. The physicochemical properties of the adsorbents were analyzed by XRD, SEM, FT-IR, Pyridine-IR, N2 adsorption, NH3-TPD, liquid infrared and ion chromatography. The results showed that a large number of hydroxyl groups (or adsorbed H2O) existed on the surface of the adsorbent and its surface acid was mainly Lewis acid, and the Zn/Al ratio affected the morphology, specific surface area and acid content of the adsorbent. The sample ZnAl-LDO-2 with Zn/Al ratio of 2:1 exhibited the best dechlorination and regeneration performance. The increase of Lewis acid amount and the relatively higher hydroxyl groups and specific surface area were confirmed to be responsible for excellent dechlorination performance of ZnAl-LDO-2. Under reaction temperatures 150 °C, the organochlorine was converted into Cl− and the corresponding alcohol on the adsorbent. Based on the above analysis, a reaction mechanism for adsorption-based dechlorination was proposed.

Graphical Abstract