H.Q. Rong
金属学报(英文版)
Porous structure and surface chemistry of activated carbon fibers obtained by differ-ent precursors and activation methods were investigated. Adsorption isotherms werecharacterized by nitrogen adsorption at 77K over a relative pressure range from 10 6to 1. The regularization method according to Density Functional Theory (DFT) wasemployed to calculate the pore size distribution in the samples. Their specific surfaceareas were calculated by BET method, micropore volume and microporous specificsurface area calculated by t-plot method and MPD by Horvath-Kawazoe equation. Mi-cropore volume of rayon-based ACF was higher than that of other samples. The staticand dynamic adsorption capacity for formaldehyde on different ACFs was determined.The results show that steam activated Rayon-based A CFs had higher adsorption capac-ity than that of steam and KOH activated PAN-A CFs. Breakthrough curves illustratedthat Rayon-ACFs had longer breakthrough time, thus they possessed higher adsorp-tion capacity for formaldehyde than that of PAN-ACFs. The entire sample had smalladsorption capacity and short breakthrough time for water. Rayon-A CFs had exccl-lent adsorption selectivity for formaldehyde than PAN-ACFs. And the samples withhigh surface areas had relatively high adsorption capacity for formaldehyde. Elementaicontent of different A CFs were performed. Rayon-based A CFs contained more oxygenthan PAN-ACFs, which may be attributed to their excellent adsorption capacity forformaldehyde.
关键词:
activated carbon fiber
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杨继华
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张景林
材料导报
从表面化学和动力学角度入手,研究了纳米微晶的长大团聚机理.分析纳米微晶长大过程中,液膜存在于固-气体系中,其在固、气相两侧存在的浓度差是微晶长大的动力.研究表明,纳米微晶的团聚不仅受分子间作用力的影响,还受到其表面自由能的影响,通过改变纳米微晶的表面自由能来控制晶体的长大和团聚,并提出了控制途径和方法.
关键词:
纳米微晶
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团聚
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表面化学
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动力学
赵伟刚
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罗路
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王洪艳
材料科学与工程学报
doi:10.14136/j.cnki.issn 1673-2812.2016.05.033
能源和环境被认为是本世纪人类面临的两大挑战,从而引起了人们对于“氢经济”的关注,但是氢气的储存是制约“氢经济”发展的最主要的因素.本文简述了不同的储氢方法以及氢能实用化的目标,回顾了以KOH活化制备高比表面积活性炭的的机理和影响因素,并综述和评价了影响高比表面积活性炭吸附储氢的主要影响因素,即比表面积和微孔孔容、孔径大小和分布、表面含氧官能团和杂原子掺杂.到目前还没有一种材料(包括高比表面积活性炭)可以满足美国能源部(DOE)设定储氢系统实用化的目标,对于高比表面积活性炭的孔径控制以及改性研究或许是实现这一目标的途径.
关键词:
氢
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吸附
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高比表面积活性炭
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多孔性
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表面特性
