文献类型：期刊文献

英文题名：Methane Recovery from Coal Bed Gas Using Modified Activated Carbons: A Combined Method for Assessing the Role of Functional Groups

作者：Li, Ziyi[1];Liu, Yingshu[1];Zhang, Chuanzhao[2];Yang, Xiong[1];Ren, Jianliang[1];Jiang, Lijun[1]

第一作者：Li, Ziyi

通讯作者：Zhang, CZ[1]

机构：[1]Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China;[2]Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China

第一机构：Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China

通讯机构：[1]corresponding author), Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China.|[1141726]北京联合大学生物化学工程学院;[11417]北京联合大学;

年份：2015

卷号：29

期号：10

起止页码：6858-6865

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20154301430931);Scopus(收录号：2-s2.0-84945205792);WOS:【SCI-EXPANDED(收录号:WOS:000363068100075)】；

基金：The authors express their gratitude to the National High Technology Research and Development Program of China (2011AA06Z228) and the Fundamental Research Funds for the Central Universities (FRF-SD-12-006B).

语种：英文

外文关键词：Activated carbon - Adsorption - Amides - Ammonia - Chemical modification - Coal deposits - Cost effectiveness - Density functional theory - Fourier transform infrared spectroscopy - Metal recovery - Methane - Potassium hydroxide - Surface chemistry

摘要：Chemical modification at room temperature on adsorbents is a cost-effective and convenient way of enhancing the methane recovery from the coal bed gas. In this study, modifications on coconut-shell-based activated carbons (ACs) by aqueous ammonia and KOH agents were investigated and their performances on CH4/N-2 separation were evaluated through equilibrium and dynamic adsorption tests. The roles of the oxygen- and nitrogen-containing groups in selective adsorption for CH4 over N-2 on modified ACs were mainly discussed on the basis of the results of the Fourier transform infrared spectroscopy (FTIR) characterization and the density functional theory (DFT) calculation. With this combined method, the practical changes in AC surface chemistry during modifications and the theoretical adsorption energies of CH4 and N-2 over graphene models were obtained. Aqueous ammonia was shown to improve equilibrium and dynamic selectivities of CH4 by 11.7 and 14.9%, respectively, likely as a result of the introductions of amine and amide capable of differentiating the adsorption energy of CH4 and N-2 on ACs. However, KOH modification reduced the selectivity of CH4 as a result of the decreases in amine and hydroxyl, despite an increased CH4 adsorption capacity likely as a result of the decreased epoxy and hydroxyl.