Synthesis of Monodisperse Zeolite A/Chitosan Hybrid Microspheres and Binderless Zeolite A Microspheres
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- 作者：Liang Yu ; Jie Gong ; Changfeng Zeng ; Lixiong Zhang
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：February 8, 2012
- 年：2012
- 卷：51
- 期：5
- 页码：2299-2308
- 全文大小：549K
- 年卷期：v.51,no.5(February 8, 2012)
- ISSN：1520-5045
文摘
Zeolite A/chitosan hybrid microspheres with uniform particle size of 700 渭m and high crushing strength were prepared by bioorganic molecule-assisted impregnation-gelation-hydrothermal synthesis of silica/chitosan hybrid microspheres in a sodium aluminate alkaline solution. Binderless zeolite A microspheres with similar particle size and medium crashing strength were subsequently obtained after calcination of the zeolite A/chitosan hybrid microspheres. The silica/chitosan hybrid microspheres were prepared by solidification of chitosan microdroplets, which were formed in a microfluidic device from a silica sol鈥揷hitosan aqueous solution, in the sodium aluminate alkaline solution. X-ray diffraction, FT-IR, scanning and transmission electron microscopy, thermogravimetric analysis, and adsorption were applied to examine the obtained products. The zeolite A/chitosan hybrid microspheres are composed of zeolite A crystals with particle sizes of 200鈥?00 nm and chitosan, with zeolite A crystals covered with and linked by chitosan. Removal of chitosan in the zeolite A/chitosan hybrid microspheres by calcination has no influence on the structure of the microspheres. Furthermore, the resulting binderless zeolite A microspheres exhibit a high surface area of 30 m2 g鈥?, high static water adsorption amount of 290 mg g鈥?, and quite different adsorption capacities for CH4 from H2, with a high ideal separation factor for CH4/H2 of 12. The crushing strength of binderless zeolite A microspheres can be greatly enhanced after a secondary growth. In addition, the formation process of the microspheres was analyzed.