Continuous (hydro-)dechlorination of aromatic chloride compounds in benzyltoluene

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-05-15 Epub Date: 2025-04-19 DOI:10.1016/j.ijhydene.2025.04.116

K. Mitländer , J. Henseler , F. Rullo , P. Nathrath , M. Geißelbrecht , P. Wasserscheid , P. Schühle

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Abstract

Benzyltoluene is an attractive liquid organic hydrogen carrier (LOHC) compound but needs to be purified after its technical synthesis to remove chloride impurities that would harm the Pt-based hydrogenation and dehydrogenation catalysts used for the reversible LOHC loading and unloading with hydrogen. For this purpose the dechlorination of chlorobenzyltoluene in a benzyltoluene matrix was studied in a continuously operated trickle bed reactor using a commercially available nickel catalyst. The results indicate that the removal of chlorobenzyltoluene is mainly adsorption based. Rapid aging experiments with purposely added chloroaromatic compounds (chlorobenzene and chloronaphthalene) in quantities of up to 9000 ppm suggest that high chloroaromatic loadings lead to reduced dechlorination activity due to a rapid blocking of active sites. The dechlorination capacity per gram of the used catalyst material was determined to be in the range of 2 kg of technical benzyltoluene.

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苯甲苯中芳香族氯化合物的连续（氢-）脱氯

苯甲苯是一种极具吸引力的液态有机氢载体（LOHC）化合物，但在其技术合成后，需要对其进行纯化，以去除氯离子杂质，这些杂质会对用于可逆LOHC装卸氢的pt基加氢和脱氢催化剂造成损害。为此，在连续运行的滴流床反应器中，使用市售镍催化剂研究了苯甲苯基质中氯酶甲苯的脱氯。结果表明，氯苄甲苯的去除主要以吸附法为主。故意添加高达9000 ppm的氯芳香族化合物（氯苯和氯酞）的快速老化实验表明，由于活性位点的快速阻断，高氯芳香族负荷导致脱氯活性降低。测定了每克所用催化剂材料的脱氯能力在2千克工业苯甲苯的范围内。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.