Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (19): 1912-1916. Previous Articles     Next Articles

固相转晶合成含硼CF-2沸石过程中甲胺分子的状态变化

成云飞, 董维阳, 龙英才, 贺鹤勇   

  1. 复旦大学化学系, 上海市分子催化和功能材料重点实验室, 上海, 200433
  • 投稿日期:2004-01-05 修回日期:2004-06-01 发布日期:2014-02-17
  • 通讯作者: 董维阳,E-mail:wydong@fudan.edu.cn;贺鹤勇,E-mail:heyonghe@fudan.edu.cn;Fax:(+86)-021-65642978 E-mail:wydong@fudan.edu.cn,heyonghe@fudan.edu.cn
  • 基金资助:
    国家杰出青年基金(No.20005310)、国家重点基础研究发展规划(No.2003CB615807)和上海市科学技术委员会重大基础研究(No.03DJ14004)资助项目.

State Changes of Methylamine Molecules in Synthetic Process of Boron-containing CF-2 Zeolite by Solid-phase Transformation

CHENG Yun-Fei, DONG Wei-Yang, LONG Ying-Cai, HE He-Yong   

  1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433
  • Received:2004-01-05 Revised:2004-06-01 Published:2014-02-17

The state changes of methylamine molecules in synthesis process of boron-containing CF-2 zeolite transformed from porous glass granules in a vapor phase of methylamine and water were studied using 13C MAS NMR and TG-DTG techniques. The results show that the methylamine molecules go through three states during the entire process of reaction. At the early stage of reaction, methylamine molecules weakly interact with the hydroxyls on the surfaces of porous glass. With the progress of reaction, part of them change to strongly interacting ones, resulting in co-existence of weakly and strongly interacting methylamine molecules. Then the strongly interacting methylamine molecules together with Si-OH, Al-OH, B-OH form nuclei, which grow up to form CF-2 zeolite crystals. The methylamine molecules gradually enter into the zeolite channels. At this stage, there are three kinds of methylamine, i.e., weakly and strongly interacting ones in porous glass, and molecules in zeolite channels. With further reaction, the weakly and strongly interacting methylamine molecules successively disappear. Finally, there are only free and protonated molecules located in the channels of CF-2 zeolite. SEM images support the transformation process from porous glass granules to boron-containing CF-2 zeolite in morphology.

Key words: boron-containing CF-2, zeolite, transformation process, porous glass granule, 13C MAS NMR, TG2DTG