摘要
采用原位拉曼光谱研究了TBAB·38H_(2)O水合物和冰粉分别在 2 MPa、278.00 K和 2 MPa、271.70 K条件下对CO_(2)的吸附过程,利用粉末X射线衍射(PXRD)研究了吸附前后样品的晶体结构。原位拉曼表征结果表明,两种水合物相中CO_(2)特征峰峰强度的增长过程均经历了快速吸附和缓慢吸附两个阶段,其中TBAB·38H_(2)O经历快速吸附阶段所需的时间更短,能够更快达到CO_(2)吸附饱和。PXRD表征结果表明,TBAB·38H_(2)O水合物在吸附CO_(2)后形成了n CO_(2)·TBAB·38H_(2)O水合物,晶体结构空间群由Pmma转变为Imma;冰粉中的水分子与气相中的CO_(2)分子形成了CO_(2)水合物,晶体结构空间群由P63mmc转变为Pm3n。研究结果验证了半笼型水合物能够以固体形态直接吸附CO_(2),同时可为新型水合物法CO_(2)捕集技术的发展与应用提供参考。
The adsorption processes of CO_(2)by TBAB·38H_(2)O hydrate and ice powder at 2 MPa, 278.00 K and 2 MPa, 271.70 K respectively were studied by in situ Raman spectroscopy. The crystal structures of the samples before and after the CO_(2)adsorption was also measured by PXRD. The in situ Raman characterization results show that the growth process of peak intensity of CO_(2)in the two kinds of CO_(2)in the two hydrate phases experiences two stages: rapid adsorption and slow adsorption. Among them,TBAB·38H2O hydrate requires shorter time in the rapid adsorption stage, and promotes the CO_(2)adsorption to reach saturation sate faster. The PXRD characterization results show that TBAB·38H2O hydrate formes n CO_(2)·TBAB·38H2O hydrate after CO_(2)adsorption, and the crystal structure changes from Pmma to Imma. The CO_(2)hydrate is formed from water molecules in ice powder and CO_(2)molecules in gas phase, and the space group of the crystal structure changes from P63mmc to Pm3n. The results verify that semi-clathrate hydrates can adsorb CO_(2)directly in solid form, and can provide a reference for the development and application of new CO_(2)capture technology by hydrate method.
作者
陈玉凤
胡榕华
李强
CHEN Yufeng;HU Ronghua;LI Qiang(Department of Chemical Engineering and Resource Recycling,Wuzhou University,Wuzhou 543002,Guangxi,China)
出处
《天然气化工—C1化学与化工》
CAS
北大核心
2022年第2期83-88,128,共7页
Natural Gas Chemical Industry
基金
广西自然科学基金项目(2015GXNSFBA139242)
广西高校中青年教师科研基础能力提升项目(2020KY17021)。
