Adsorption Separation of CO2/CH4 Gas Mixture on Carbon Molecular Sieves Modified by Potassium Carbonate

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• 作者：Dingding Liu ; Honghong Yi ; Xiaolong Tang ; Shunzheng Zhao ; Zhixiang Wang ; Fengyu Gao ; Qian Li ; Bin Zhao
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：July 14, 2016
• 年：2016
• 卷：61
• 期：7
• 页码：2197-2201
• 全文大小：353K
• 年卷期：0
• ISSN：1520-5134

文摘

In order to improve the separation performance of CO₂/CH₄ on carbon molecular sieves (CMS), CMS was modified by metal in this study. The surface of CMS had −OH, which could provide a great support for the chemical modification. In this paper, different metal ions, precursors of potassium, loading concentration of potassium carbonate (K₂CO₃), and calcination temperature were investigated for CO₂/CH₄ separation. Results showed that CMS loaded with K₂CO₃ and calcined at 773–873 K was the best for CO₂/CH₄ separation. Compared with the untreated CMS, the adsorption capacity of CO₂ for the best adsorbent increased from 1.15 to 1.72 mmol·g^–1 and the value of separation factor increased from 1.9 to 2.75 mmol·g^–1. The K₂CO₃ treatment was effective in generating metal oxide K₂O and KO₂, which could facilitate the adsorption of CO₂ after K₂CO₃/CMS being calcined. However, the reaction between CH₄ and metal was weak. In summary, K₂CO₃/CMS was proved to be one of the candidates for CO₂/CH₄ separation.