文献类型：期刊文献

英文题名：Oxygen-enriched carbon molecular sieve hollow fiber membrane for efficient CO2 removal from natural gas

作者：Wang, Kaixin[1];Fang, Chuning[1];Li, Zhi[1];Zhao, Guanran[1];Wang, Yixing[2];Song, Zhen[1,2];Lei, Linfeng[1,2];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Suzhou 215100, Peoples R China

年份：2024

卷号：347

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20241715960551);WOS:【SCI-EXPANDED(收录号:WOS:001218524800001)】；

基金：This study was supported by the National Key Research & Develop- ment Program of China (2022YFB3805503 and 2021YFB3801301) , the National Natural Science Foundation of China (22208096) , and the Shanghai Pujiang Program (21PJ1401900) .

语种：英文

外文关键词：Carbon molecular sieve hollow fiber membrane; CO2 separation; In-situ reduction; Natural gas; Oxygen-rich carbon structure

摘要：Natural gas is considered one of the most attractive low carbon energy sources while the separation of CO 2 is a crucial process for the natural gas purification. Herein, cellulose-based carbon molecular sieve (CMS) hollow fiber membranes with high CO 2 affinity capability were fabricated through a post-treatment strategy of hydrogen-induced reduction followed by oxygen -doped modification (H -O treatment), and show good potential for high pressure natural gas purification. The CMS membranes were reduced by H 2 at high temperatures (500 - 600 degrees C) to form active sorption sites in the carbon matrix, and subsequently chemically absorbed O 2 to generate oxygen-containing functional groups, which are favorable for CO 2 adsorption and diffusion. After being treated at 600 degrees C (CMS-600), the CMS membrane presented a high CO 2 adsorption capacity of 62.78 cm 3 /g (298 K). As a result, the CO 2 permeability was enhanced from 264 to 1125 Barrer, with approximately 400 % improvement. Moreover, mixed gas separation performances (CO 2 /N 2 and CO 2 /CH 4 ) were investigated at high pressure and impurities feedings. The CMS membrane exhibited a remarkable CO 2 /CH 4 separation factor of 104 when operated at 20 bar and 500 ppm heptane existed.