CeO2对CuCl/活性炭吸附剂C2H4/C2H6吸附分离性能促进作用

引用本文: 邢建东, 敬方梨, 储伟, 孙红丽, 喻磊, 张欢, 罗仕忠. CeO₂对CuCl/活性炭吸附剂C₂H₄/C₂H₆吸附分离性能促进作用[J]. 物理化学学报, 2015, 31(11): 2158-2164. doi: 10.3866/PKU.WHXB201510091 shu

Citation: XING Jian-Dong, JING Fang-Li, CHU Wei, SUN Hong-Li, YU Lei, ZHANG Huan, LUO Shi-Zhong. Improvement of Adsorptive Separation Performance for C₂H₄/C₂H₆ Mixture by CeO₂ Promoted CuCl/Activated Carbon Adsorbents[J]. Acta Physico-Chimica Sinica, 2015, 31(11): 2158-2164. doi: 10.3866/PKU.WHXB201510091 shu

CeO₂对CuCl/活性炭吸附剂C₂H₄/C₂H₆吸附分离性能促进作用

邢建东 ^1,2, ,
敬方梨 ^1,2, ,
储伟 ^{1,2,
,} ,
孙红丽 ^1, ,
喻磊 ^1, ,
张欢 ^1, ,
罗仕忠 ^{1,
,}

1.
1 四川大学化学工程学院, 成都 610065;
2.
2 四川大学新能源与低碳技术研究院, 成都 610207

通讯作者: 储伟, 罗仕忠; 储伟, 罗仕忠

基金项目:
国家自然科学基金(21476145)资助项目 (21476145)

摘要: 通过等体积浸渍方法制备了添加CeO₂助剂的用于C₂H₄/C₂H₆吸附分离的CuCl/活性炭(AC)吸附剂, 使用氮气吸附-脱附曲线、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、能量分散X射线光谱(EDX)等分析方法对吸附剂进行了表征. 结果表明, 吸附剂表面Cu(II)在氮气气氛焙烧过程中被部分还原成Cu(I). 重点研究了Ce元素的添加对于吸附剂的C₂H₄/C₂H₆吸附分离性能的影响, 等温吸附曲线结果表明添加了CeO₂的吸附剂通过降低乙烷的吸附容量从而显著提高了吸附分离性能. XRD及XPS结果表明, 和未添加助剂样品相比, 其表面晶体团簇较小, 分散性更好, Cu(II)还原程度更高. 添加CeO₂的吸附剂样品5Ce50Cu(CeO₂和CuCl2的质量分数(w)分别为5%和50%)获得了最好的吸附分离效果, 相对于未添加CeO₂的样品50Cu,其在660 kPa下的吸附选择性由4.2提升到8.7.

关键词:

English

Improvement of Adsorptive Separation Performance for C₂H₄/C₂H₆ Mixture by CeO₂ Promoted CuCl/Activated Carbon Adsorbents

1.
1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
2.
2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, P. R. China

Corresponding author: 储伟, 罗仕忠; 储伟, 罗仕忠

Received Date: 10 July 2015
Fund Project:
国家自然科学基金(21476145)资助项目

Abstract: CeO₂ promoted CuCl/activated carbon (AC) adsorbents were prepared using an incipient wetness impregnation method, and characterized using N₂ adsorption/desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The Cu(II) on the AC surface was reduced to Cu(I) when calcination was performed in a nitrogen flow. The effects of Ce on the C₂H₄/C₂H₆ adsorptive separation performance were investigated. The adsorption isotherms showed that the addition of CeO₂ improved the separation performance by decreasing the C₂H₆ adsorption capacity compared with that of the nonpromoted sample. The XRD and XPS results indicated that the active crystal particles on the AC surface became smaller, leading to higher dispersion and a higher degree of Cu(II) reduction. The best adsorption selectivity was obtained using the 5Ce50Cu [CeO₂ and CuCl2 mass fractions (w) 5% and 50%, respectively] sample, i.e., with CeO₂ in the adsorbent; the adsorption selectivity increased from 4.2 to 8.7 at 660 kPa compared with that of the 50Cu sample.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

CeO₂对CuCl/活性炭吸附剂C₂H₄/C₂H₆吸附分离性能促进作用

通讯作者: 储伟, 罗仕忠; 储伟, 罗仕忠

English

Improvement of Adsorptive Separation Performance for C₂H₄/C₂H₆ Mixture by CeO₂ Promoted CuCl/Activated Carbon Adsorbents

Corresponding author: 储伟, 罗仕忠; 储伟, 罗仕忠

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