文献类型：期刊文献

英文题名：Preoxidation Enables Enhanced Separation Performance in Cellulose-Derived Carbon Molecular Sieve Membranes for CO2 Removal from Natural Gas

作者：Meng, Xinru[1];Zhu, Xiaoxiao[1];Li, Kun[1];Guo, Yaohao[2];Li, Feng[1];Lei, Linfeng[1,2];Xu, Zhi[1]

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

年份：2026

卷号：65

期号：11

起止页码：6261

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20261320355412);WOS:【SCI-EXPANDED(收录号:WOS:001714854500001)】；

基金：This study was supported by the National Key Research & Development Program of China (2022YFB3805503 and 2021YFB3801301) and the National Natural Science Foundation of China (22208096).

语种：英文

外文关键词：Carbon - Carbon dioxide - Carbonization - Cellulose - Gas permeable membranes - Hydrogen bonds - Nafion membranes - Natural gas - Structural design

摘要：Cellulose-based carbon molecular sieve (CMS) hollow fiber membranes show promising potential for natural gas sweetening, owing to their low cost, high CO2/CH4 selectivity, robust mechanical stability, and resistance to plasticization. However, the dense and highly crystalline structure of cellulose usually leads to a relatively low CO2 permeability in cellulose-derived CMS membranes. In this work, we propose a preoxidation strategy for cellulose to construct a cross-linked network. During preoxidation, hydrogen bonds and partial glycosidic linkages in the cellulose chains were cleaved, while hydroxyl groups were oxidized to oxygen-containing functional groups such as carboxyl and aldehyde groups. These subsequently formed an ester-bond cross-linked network. This approach effectively suppressed excessive shrinkage of the membranes during carbonization, thereby preserving a more open porous structure. As a result, the obtained hollow fiber CMS membranes exhibited a significant increase in CO2 permeability, reaching 1026 Barrer (approximately 3 times higher than that of untreated membranes) while maintaining a high CO2/CH4 selectivity of 110. Furthermore, the separation performance was evaluated under high-pressure mixed-gas conditions (10% CO2/90% CH4). The CMS hollow fiber membranes demonstrated stable operation for over 100 h with a CO2/CH4 separation factor of similar to 130, highlighting their potential for practical application in natural gas sweetening. This method is facile and provides an effective solution for the performance enhancement and structural design of cellulose-based separation membranes.