华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (6): 86-90,115.

• 化学化工 • 上一篇    下一篇

MCM-41 中孔分子筛的微波、常温和水热合成比较

夏启斌1 陈汇勇1 奚红霞1 李忠1 王欢2   

  1. 1.华南理工大学 传热强化与过程节能教育部重点实验室,广东 广州 510640 ;2. 香港科技大学 化学工程系,香港 清水湾
  • 收稿日期:2006-07-25 出版日期:2007-06-25 发布日期:2007-06-25
  • 通信作者: 夏启斌(1974-),博士,讲师,主要从事环境能源材料研究. E-mail:qbxia@scut. edu.cn
  • 作者简介:夏启斌(1974-),博士,讲师,主要从事环境能源材料研究.
  • 基金资助:

    国家自然科学基金资助项目(20476031) ;广东省自然科学基金资助项目(04020120 )

Comparison of Synthesis of Meso-Pore Zeolite M CM -41 by Microwave Crystallization , Room-Temperature Crystallization and Hydrothermal Crystallization

Xia Qi-bin1  Chen Hui-yongXi Hong-xia1  Li Zhong1  Wang Huan2   

  1. 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education , South ChinaUniv. of Tech. , Guangzhou 510640 , Guangdong , China; 2. Dept. of Chemical Engineering ,Hong Kong Univ. of Science and Tech. , Clear Water Bay , Hong Kong , China
  • Received:2006-07-25 Online:2007-06-25 Published:2007-06-25
  • Contact: 夏启斌(1974-),博士,讲师,主要从事环境能源材料研究. E-mail:qbxia@scut. edu.cn
  • About author:夏启斌(1974-),博士,讲师,主要从事环境能源材料研究.
  • Supported by:

    国家自然科学基金资助项目(20476031) ;广东省自然科学基金资助项目(04020120 )

摘要: 分别用微波晶化、常i孟晶化、水热晶化3 种方法合成MCM-41 中孔分子筛,详细比较了这3 种合成方法在操作参数和所合成分子筛物性方面的差异.实验结果表明,微波法合成的MCM-41 中孔分子筛品质优于常温晶化法合成的分子筛,与传统的水热品化法相当,甚至在某些方面优于水热晶化法.微波晶化法具有下列明显的优势:节能、操作便利、环境污染少,且在实验过程中无转晶现象;合成时间短,较传统水热晶化法省时3 -4 倍;样品比表面积可达100m2/g 以上,晶粒直径小至30nm ,且呈高度均匀分散分布,结构致密,孔径最可几分布极窄,孔容积可达1. 178mL/ g ,具有良好的高温稳定性(大于900℃)及水热
稳定性(分子筛孔壁厚可达2.55nm). 因此微波晶化法完全有望取代传统的水热晶化法,成为制备MCM-41 中孔分子筛的实用化技术.

关键词: 分子筛, 微波晶化, 常温晶化, 水热晶化

Abstract:

Meso-pore zeolite MCM - 41 was synthesized by means of microwave crystallization , room-temperature crystallization and hydrothermal crystallization. Then , the operation parameters of these three methods and the physical properties of the resulted MCM-41 were compared in detail. Experimental results suggest that (1) MCM-41 prepared via microwave crystallization possesses better properties than that prepared via room-temperature crystallization, even better than that prepared via the traditional hydrothermal crystallization j (2) microwave crystallization is energy-saving and eco-friendly , and is easy to operate without CIγstalline conversion in the crystallization process j (3) the synthesis period of microwave crystallization is 2 - 3 times less than that of the traditional hydrothermal crystallization j (4) the resulted M CM -41 prepared via microwave crystallization possesses high dispersion degree , narrow pore size distribution , good thermal stability (more than 900℃) and excellent hydrothermal stability ,and is of a specifie surface area of more than 1000 m2/g, a crystal diameter of 30 nm , a pore volume of 1. 178 mL/g and a pore wall thickness of 2. 55 nm. It is thus concluded that the microwave crystallization , instead of the traditional hydrothermal one , will become a practical technology for synthesizing MCM-41.

Key words: zeolite, microwave crγstallization, room-temperature crystallization, hydrothermal crystallization