Citation:
Xuchuan Chen, Mei Dong, Xianjun Niu, Kai Wang, Gang Chen, Weibin Fan, Jianguo Wang, Zhangfeng Qin. Influence of Zn species in HZSM-5 on ethylene aromatization[J]. Chinese Journal of Catalysis,
;2015, 36(6): 880-888.
doi:
10.1016/S1872-2067(14)60289-8
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Zn-containing HZSM-5 zeolites with different Zn contents were prepared by ion exchange and physically mixing methods, and were characterized by X-ray diffraction, scanning electron microscope, N2 adsorption-desorption, NH3 temperature programmed desorption, pyridine adsorption infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. Zn species introduced into HZSM-5 were identified as ZnO crystals, ZnO clusters in the zeolite channel and Zn(OH)+ species formed from a solid state reaction between dispersed ZnO and the protons in the zeolite. The preparation method has a significant influence on the distribution of the Zn species. The catalytic behavior of Zn-containing HZSM-5 with different Zn contents showed that the Zn(OH)+ and ZnO species were responsible for aromatic formation from ethylene.
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Keywords:
- Ethylene,
- Aromatization,
- Zn species,
- HZSM-5,
- Dehydrogenation
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