在基于煤炭的活性炭上调节含有酸性氧的功能组,以增强甲吸附和扩散
Xinxin Liu1,2,3, Qingzhao Li1,2,3, Jianyun Zhu1,2,3
1State Key Laboratory of Coal Mine Disaster Prevention and Control, China University of Mining and Technology, Xuzhou 221116, China.
Langmuir : the ACS journal of surfaces and colloids
|July 21, 2025
概括
通过孔隙和表面修饰优化基于煤炭的活性炭可以增强甲的捕获. 这种定制的吸附剂通过压力摆动吸附显著改善了低度煤矿气的丰富.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 从煤矿气中有效捕获甲对于安全和能源回收至关重要.
- 压力摇摆吸附 (PSA) 是气体分离和净化的一个关键技术.
- 吸附性质对低度气流的PSA效率有显著的影响.
研究的目的:
- 研究孔隙结构和表面化学对甲吸附的协同效应.
- 开发一种优化的基于煤炭的活性炭,用于增强甲丰富.
- 为了阐明吸附机制和扩散动力学.
主要方法:
- 以煤为基础的活性炭是通过先氧化和受控的KOH激活来修改的.
- 孔隙结构和表面化学特征 (例如,CH2/CH3比率,含氧组).
- 进行了甲吸附异温和动力学研究,以分析吸附能力和扩散.
主要成果:
- 一个最佳的碳与比 (1:4) 产生了微孔和小间孔主导的结构 (91.26%的孔量).
- 表面修改通过含氧组增强了物理吸收潜力和甲亲和力.
- 确定了一种两阶段的扩散机制,其中包括边界层转移和微孔扩散.
结论:
- 孔隙和表面性能的协同调节对于高性能吸附剂至关重要.
- 开发的活性炭显示了有效捕获和从煤矿气中分离甲的巨大潜力.
- 了解扩散机制是优化PSA过程的关键.
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