Synthesis of binderless zeolite X microspheres and their CO2 adsorption properties

被引:58
|
作者
Yu, Liang [1 ]
Gong, Jie [1 ]
Zeng, Changfeng [2 ]
Zhang, Lixiong [1 ]
机构
[1] Nanjing Univ Technol, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Peoples R China
[2] Nanjing Univ Technol, Coll Mech & Power Engn, Nanjing 210009, Peoples R China
基金
中国国家自然科学基金;
关键词
Chitosan; Binderless zeolite X microsphere; Ion-exchange; CO2 adsorption and separation; CARBON-DIOXIDE; SEPARATION; CAPTURE; ALKALI; 13X; CH4; MONOLITHS; NANOPARTICLES; MIXTURES; NITROGEN;
D O I
10.1016/j.seppur.2013.06.035
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Binderless zeolite NaX microspheres were readily prepared by using chitosan-assisted synthesis. The synthesis was conducted by hydrothermal treatment of silica/chitosan hybrid microspheres formed from a silica sol-chitosan mixture solution in a sodium aluminate alkaline solution, followed by calcination to remove the chitosan. The obtained microspheres are composed of compactly packed and intergrown octahedral particles with a particle size of ca. 500-750 nm, and exhibit an uniform particle size of ca. 1.3 mm, medium crashing strength and a surface area of 931 m(2)/g that is greater than that of the conventionally prepared zeolite X powders. CO2, CH4 and N-2 adsorption under both ambient and elevated pressures to 1000 kPa at 298 K on the binderless NaX microspheres and Ca2+ and Kr+-exchanged ones were measured. Separation of CO2/CH4 and CO2/N-2 mixtures on the CaX microspheres in breakthrough experiments was performed. The binderless NaX microspheres have larger CO2 adsorption capacity than reported zeolite X powders and the binderless CaX and KX microspheres. The CaX microspheres have the highest ideal separation factors for CO2 from CH4 and N-2 under mild conditions. The separation factors of CO2/N-2 and CO2/CH4 mixtures on CaX microspheres are 79 and 12, respectively. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:188 / 195
页数:8
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