Volume 41 Issue 05
May  2013
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YANG Rui-juan, YANG Dong-hua, WU Zheng-huang, FENG Xiao-na, DOU Tao, WU Zhong-hua, LI Zhi-hong, YAN Ze, WANG Fan, TANG Qiong. Synthesis and characterization of microporous EU-1/ZSM-5 composite zeolite containing iron[J]. Journal of Fuel Chemistry and Technology, 2013, 41(05): 601-606.
Citation: YANG Rui-juan, YANG Dong-hua, WU Zheng-huang, FENG Xiao-na, DOU Tao, WU Zhong-hua, LI Zhi-hong, YAN Ze, WANG Fan, TANG Qiong. Synthesis and characterization of microporous EU-1/ZSM-5 composite zeolite containing iron[J]. Journal of Fuel Chemistry and Technology, 2013, 41(05): 601-606.

Synthesis and characterization of microporous EU-1/ZSM-5 composite zeolite containing iron

  • Received Date: 2012-09-12
  • Rev Recd Date: 2012-12-24
  • Publish Date: 2013-05-30
  • Microporous EU-1/ZSM-5 composite zeolites containing iron were synthesized using preset crystal seed method. The as-synthesized Fe-EU-1/ZSM-5 samples were characterized by a serious of techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric-derivative thermogravimetric (TG-DTG), N2 adsorption/desorption, UV-visible diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray absorption fine structure (XAFS). The results show that the composite zeolite is found consisting characteristic diffraction peaks for two kinds of zeolite structure: EU-1 and ZSM-5. The composite zeolite is a kind of molecular dispersion material with two crystal phases interaction and its micropore size is larger than Fe-EU-1 zeolite. With increasing the mass fraction of Fe in the original sol-gel, the characteristic diffraction peaks of composite zeolites in the 23.09° and 23.94° gradually migrate to lower angle direction. UV-vis spectrum shows that there is a broad absorption band at about 220~245 nm. The XAFS results show that the week pre-edge absorption peak for 1s→3d gradually strengthen, at the same time the absorption peak for 1s→4p in the top of absorption edge has tapper. The optimized synthesis conditions for the microporous EU-1/ZSM-5 composite zeolites containing iron are as follows: 0.075%~0.15% of the mass fraction of Fe in the original sol-gel, 15.0%~21.0% of the mass fraction of ZSM-5 zeolite in the original sol-gel and 50~60 of SiO2/Al2O3 mol ratio of ZSM-5 zeolite.
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