Organic-free,Ultrafast Synthesis of K-CHA Nano-aggregates with Various Morphologies and Their Adsorption Performances

作     者：CHU Kailiang WANG Yaquan LIU Wenrong BU Lingzhen HUANG Yitong GUO Niandong QU Liping SANG Juncai LI Yaoning SU Xuemei ZHANG Xian CHU Kailiang;WANG Yaquan;LIU Wenrong;BU Lingzhen;HUANG Yitong;GUO Niandong;QU Liping;SANG Juncai;LI Yaoning;SU Xuemei;ZHANG Xian

作者机构：Key Laboratory for Green Chemical Technology of Ministry of EducationSchool of Chemical Engineering&TechnologyTianjin UniversityTianjin 300072P.R.China Haihe Laboratory of Sustainable Chemical TransformationsTianjin 300192P.R.China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2024年第40卷第6期

页      面：1151-1159页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(No.21276183) 

主　　题：Chabazite Organic structure directing agent(OSDA)-free Nano-aggregate Methane Adsorption separation 

摘      要：K-Chabazite(K-CHA)zeolites were synthesized with an ultrafast procedure through an eco-friendly and cost-effective“one-pot*** solely employing colloidal silica and aluminum hydroxide in the K^(+)/Sr^(2+)system without the assistance of seeds,fluorides or organic structure as directing agents,the K-CHA nano-aggregates were successfully synthesized in a few *** crystallization behavior of the gels with different SiO_(2)/Al_(2)O_(3) molar ratios(SARs)was investigated using X-ray diffraction(XRD);scanning electron microscope(SEM);X-ray fluorescence(XRF);27Al and 29Si magic angle spinning nuclear magnetic resonance(MAS NMR);Fourier-transform infrared spectra(FTIR);UV-Raman *** the nucleation rates were changed with the SARs,three kinds of K-CHA nano-aggregates,namely,hamburger-,disk-and walnut-shaped,were obtained.A possible formation mechanism of the K-CHA nano-aggregates was ***,the walnut-shaped sample with an SAR of 7 possessed the largest pore volume and specific surface area,resulting in the highest methane adsorption ***,it exhibited a CH_(4)/N_(2) selectivity of more than 3 under relative pressures ranging from 0 to *** work offers guidance for modifying the stacking modes of other nano-sized zeolites.