Citation: ZHANG Ling, WANG Hai-Yan, JIANG Zhong-Xiang, WANG Yu-Jia. Synthesis and Catalytic Activity of Core-Shell MFI/CHA Zeolites[J]. Acta Physico-Chimica Sinica, ;2016, 32(3): 745-752. doi: 10.3866/PKU.WHXB201512185 shu

Synthesis and Catalytic Activity of Core-Shell MFI/CHA Zeolites

1.
1 College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266555, Shandong Province, P. R. China;
2.
2 College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China

Corresponding author: WANG Hai-Yan,
Received Date: 28 September 2015
Available Online: 16 December 2015
Fund Project: 辽宁省科技厅项目(201202126)资助 (201202126)

MFI/CHA core-shell zeolites were synthesized by a two-step hydrothermal synthesis strategy (epitaxial growth). The growth of silicoaluminophosphate SAPO-34 fabricates crystalline layers over ZSM-5 nanocrystal crystallites. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), and Fourier transform infrared (FTIR) spectroscopy. The analyses indicate that the pretreatment step of the core phase was an important step during the synthesis. The growth kinetics of the MFI/CHAcore-shell zeolites were investigated by analyzing the products obtained with different secondary crystallization times and temperatures. The core-shell zeolite shows good shape-selective catalytic performance for converting methanol to aromatic compounds.
- MFI/CHA,
- Core-shell structure,
- Hydrothermal crystallization,
- Epitaxial growth
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