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(5): 601-606. shu

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

YANG Rui-juan ¹ ,
YANG Dong-hua ^1,, ,
WU Zheng-huang ¹ ,
FENG Xiao-na ¹ ,
DOU Tao ^2,3 ,
WU Zhong-hua ⁴ ,
LI Zhi-hong ⁴ ,
YAN Ze ¹ ,
WANG Fan ¹ ,
TANG Qiong ¹

1.
1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

Corresponding author: YANG Dong-hua,
Received Date: 12 September 2012
Available Online: 24 December 2012
Fund Project: 国家重点基础发展规划(973计划,2012CB215002) (973计划,2012CB215002) 国家自然科学基金(20973123) (20973123) 煤转化国家重点实验室开放基金(11-12-603)。 (11-12-603)

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.
- preset crystal seed,
- Fe-EU-1/ZSM-5 zeolite,
- composite molecular sieves,
- synthesize
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