物理化学学报 >> 1998, Vol. 14 >> Issue (10): 906-912.doi: 10.3866/PKU.WHXB19981009

研究论文 上一篇    下一篇

以四丙基溴化铵为模板剂合成TS-1分子筛的研究

赵琦, 韩秀文, 刘秀梅, 翟润生, 林励吾, 包信和, 郭新闻, 李钢, 王祥生   

  1. 中国科学院大连化学物理研究所,催化基础国家重点实验室,116023|大连理工大学,碳资源综合利用开放实验室,大连 116012
  • 收稿日期:1998-01-12 修回日期:1998-04-30 发布日期:1998-10-15
  • 通讯作者: 包信和

Studies on the TS-1 Zeolites Synthesized by Tetrapropylammonium Bromide as Template

Zhao Qi, Han Xiu-Wen, Liu Xiu-Mei, Zhai Run-Sheng, Lin Li-Wu, Bao Xin-He, Guo Xin-Wen, Li Gang, Wang Xiang-Sheng   

  1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy Sciences,Dalian 116023|Laboratory of Comprehensive Utilization of Carbonaceous Resources,Dalian University of Technology,Dalian 116011
  • Received:1998-01-12 Revised:1998-04-30 Published:1998-10-15
  • Contact: Bao Xin-He

摘要:

运用1H→13C CP/MASNMR、29Si MAS NMR、IR、XRD和元素分析等表征方法,研究了以四丙基溴化铵(TPABr)为模板剂的合成体系中,Ti酯和模板剂用量以及不同碱源对TS-1分子筛的影响,考察了不同Ti含量固体样品催化丙烯环氧化反应.实验结果表明:随着凝胶中Ti酯用量的增加,制得的分子筛结构对称性由单斜晶系逐渐向正交晶系转变,其丙烯环氧化活性也相应增加.尽管凝胶中所加减源只调变凝胶碱度而不起模板剂作用,然而凝胶的强碱环境对骨架钛原子引入有利.当凝胶中TPABr/SiO2摩尔比值在0.05-0.25之间时,TPABr加入量的变化不影响TS-1分子筛中骨架钛含量.

关键词: 29Si MAS NMR, 1H→13C CP/MAS NMR, IR, TS-1分子筛, 四丙基溴化铵

Abstract:

 The influences of the content of titanium, the variety of the alkali and the amounts of the templates in the gels on the synthesis of the TS-1 zeolites prepared by means of tetrapropylammonium bromide (TPABr) as a template were investigated by 1H→13C CP/MAS NMR, 29SiMAS NMR, IR, XRD and element analysis techniques. The results showed that the structures of the resultant TS-1 zeolites were transferred from monoclinic symmetry to orthorhombic symmetry with the increase of the titanium content in the framework. The added alkali didn't act as a template in the synthesis of TS-1 zeolites, but the strong alkali conditions were of benefit to the incorporation of the titanium atoms into the lattices. When the molar ratios of TPABr/SiO2 in the gels varied from 0.05 to 0.25, the Ti content in the framework showed independence of the amounts of TPABr in gels.

Key words: 29Si MAS NMR, 1H→13C CP/MAS NMR, IR, TS-1 zeolites, Tetrapropylammonium bromide