Stimulating Mesoporous Characteristics of Activated Carbon through Pyrolysis of Compacted Hydroxyethyl Cellulose—A Showcase for H2S Removal

C Pub Date : 2024-05-06 DOI:10.3390/c10020043

Fuxiang Chen, Liang Hong

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Abstract

Activated carbon (AC) serves as extensively researched adsorbents, with numerous established methods for their preparation. This study originated from the hypothesis that compressing a hydrocarbon substance to create a densely compacted pellet, known as pelletizing, would enhance the development of porous features of the resulting AC. The anticipated enhancement is attributed to the rise in spatial proximity amidst HEC polymer chains within the bulk of the pellet, which facilitates aromatization both in extent and functionality. 2-Hydroxyethyl cellulose (HEC) pellets were prepared by adjusting the duration of load holding, aiming to increase the packing density of HEC polymer chains via creeping. The BET analysis of the resulting AC samples demonstrates the efficacy of compression on HEC pellets in enhancing their porous properties. The FE-SEM study revealed diverse AC surface morphologies that are associated with a set of specific pelletizing conditions. The 13C NMR spectroscopy for carbon skeletons, FT-IR spectroscopy for organic functionality, and XPS spectroscopy for surface composition collectively report the leverage of compression treatment before pyrolyzing HEC pellets. Furthermore, the assessment of hydrogen sulfide adsorption by the resulting AC samples revealed distinctive breakthrough curves, providing validation for the proposed compression effect.

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通过热解压制羟乙基纤维素激发活性炭的介孔特性--用于去除 H2S 的展示平台

活性炭（AC）是一种研究广泛的吸附剂，有许多成熟的制备方法。这项研究源于这样一个假设，即压缩碳氢化合物物质以形成致密的颗粒（称为造粒），将促进活性炭多孔特征的发展。预期的增强效果可归因于颗粒内部 HEC 聚合物链之间空间距离的增加，这有利于芳香化的程度和功能。制备 2-羟乙基纤维素（HEC）颗粒的方法是调整负载保持时间，目的是通过蠕变增加 HEC 聚合物链的堆积密度。对制备的 AC 样品进行的 BET 分析表明，对 HEC 颗粒的压缩能有效提高其多孔性。FE-SEM 研究揭示了与一系列特定造粒条件相关的不同 AC 表面形态。碳骨架的 13C NMR 光谱、有机功能的傅立叶变换红外光谱和表面成分的 XPS 光谱共同报告了热解 HEC 粒子前压缩处理的杠杆作用。此外，对所得 AC 样品进行的硫化氢吸附评估显示了独特的突破曲线，验证了所提出的压缩效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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