Preparation and Adsorption Performance of GrO@Cu-BTC for Separation of CO2/CH4

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• 作者：Wenyu Huang ; Xin Zhou ; Qibin Xia ; Junjie Peng ; Haihui Wang ; Zhong Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 9, 2014
• 年：2014
• 卷：53
• 期：27
• 页码：11176-11184
• 全文大小：450K
• ISSN：1520-5045

文摘

Composites (GrO@Cu-BTC) based on Cu-BTC and graphene oxide were synthesized by a solvothermal method for the separation of CO<sub>2sub>/CH<sub>4sub> binary mixtures. The as-synthesized composites were then characterized. The isotherms of CO<sub>2sub> and CH<sub>4sub> on the as-synthesized materials were measured by the volumetric method. The isotherms and adsorption selectivities of CO<sub>2sub>/CH<sub>4sub> binary mixtures were estimated on the basis of ideal adsorbed solution theory (IAST). The results showed that the composite 1GrO@Cu-BTC had a higher BET surface area and pore volume compared to the parent Cu-BTC. More importantly, its adsorption capacity for CO<sub>2sub> improved significantly in comparison with that of Cu-BTC, which was up to 8.19 mmol/g at 1 bar and 273 K. The dual-site Langmuir鈥揊reundlich (DSLF) model was applied favorably for fitting experimental isotherm data of CO<sub>2sub> and CH<sub>4sub> adsorption on the samples. The predicted isotherms of the binary mixture based on IAST showed that CO<sub>2sub> was more favorably adsorbed than CH<sub>4sub> on the sample 1GrO@Cu-BTC. TPD showed that the desorption activation energy of CO<sub>2sub> on 1GrO@Cu-BTC was higher than that on Cu-BTC, indicating a stronger interaction between CO<sub>2sub> molecules and 1GrO@Cu-BTC. Thus, the CO<sub>2sub>/CH<sub>4sub> adsorption selectivity of the composite 1GrO@Cu-BTC was significantly higher than that of Cu-BTC, namely, 14 at 1 bar, or 2.6 times that of Cu-BTC.