Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (10): 906-912.doi: 10.3866/PKU.WHXB19981009

• ARTICLE • Previous Articles     Next Articles

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

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