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

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-04-21 DOI:10.1007/s10562-025-05019-3

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

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Abstract

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

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ZnAl 层状双金属氧化物上石油的深度脱氯及反应机理研究

采用水热合成法制备了一系列不同锌铝比的锌铝二元吸附剂，并在30℃~ 180℃的温度范围内对其吸附去除模拟油中1-氯辛烷的性能进行了研究。采用XRD、SEM、FT-IR、吡啶- ir、N2吸附、NH3-TPD、液体红外和离子色谱分析了吸附剂的理化性质。结果表明：吸附剂表面存在大量的羟基（或被吸附的H2O），其表面酸以Lewis酸为主，锌铝比影响吸附剂的形貌、比表面积和酸含量。锌铝比为2:1的ZnAl-LDO-2样品的脱氯和再生性能最好。Lewis酸用量的增加以及相对较高的羟基和比表面积是ZnAl-LDO-2具有优异脱氯性能的原因。在150℃的反应温度下，有机氯在吸附剂上转化为Cl -和相应的醇。在此基础上，提出了吸附脱氯的反应机理。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.