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
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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.
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