Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (6): 631-636.doi: 10.15541/jim20160460

Special Issue: 环境材料

• Orginal Article • Previous Articles     Next Articles

Preparation, Characterization and Catalytic Performance of Supported Titanium Silicalite-1 Zeolite Membrane Catalyst

Yu GUO1(), Dong-Xin LI1,2, Hong-Mei WU1, Yu-Jia JIN1, Li-Dai ZHOU1, Qiang-Qiang CHEN1   

  1. 1. School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China
    2. Shenyang Longchang Pipeline Survey Center of PetroChina, Shenyang 110168, China
  • Received:2016-08-08 Revised:2016-09-19 Online:2017-06-20 Published:2017-05-27
  • Supported by:
    National Natural Science Foundation of China (21103076, 21601075);Natural Science Foundation of Liaoning Province (2015020249, SY2016009);Program for Liaoning Excellent Talents in University (LJQ2012055)

Abstract:

Titanium silicalite-1(TS-1) zeolite membranes were successfully prepared on porous α-Al2O3 tubes using hydrothermal synthesis method for epoxidation of propylene to propylene oxide (PO). SEM, XRD, FT-IR, and UV-vis spectroscopy were used to investigate the effects of Ti/Si molar ratio on surface morphology and structure of the TS-1 zeolite membrane. When the Ti/Si molar ratio was set between 0.01 and 0.04, continuous and compact TS-1 zeolite membranes were deposited on the porous support. The obtained TS-1 membranes displayed typical characteristics diffraction peaks of MFI structure. With the increase of the Ti/Si molar ratio, the deposition amounts of the TS-1 zeolites decreased. As a result, some intercrystalline defects were formed and the propylene permeance increased. For the TS-1 membranes prepared with the Ti/Si molar ratio of 0.03-0.04, poor PO selectivity and low PO formation rate were observed in the epoxidation reaction of propylene. This was attributed to the formation of extra-framework TiO2 in the TS-1 membranes that could catalyze the decomposition of hydrogen peroxide. In contrast, the TS-1 membrane prepared with the Ti/Si ratio of 0.02 exhibited the best catalytic performance. The conversion of hydrogen peroxide, PO selectivity and PO formation rate were 12.43%, 95.80% and 15.78 mmol/(h·g), respectively. Moreover, the regeneration tests revealed that the catalytic ability of the TS-1 membrane was relatively stable after regeneration for 8 times. And the TS-1 membrane was easier to be separated and recovered after reaction.

Key words: titanium silicalite-1 zeolite, zeolite membrane, hydrothermal synthesis, propylene oxide

CLC Number: 

  • TQ174