Citation: CUI Meng-Tao, WANG Zhong, LI Xue-Bing, LI Ming-Shi. Synthesis of ZSM-5 Containing Framework Iron and Catalytic Performance of Supported Pt Catalysts in Dehydrogenation of n-Dodecane[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(5): 885-892. doi: 10.11862/CJIC.2020.093 shu

Synthesis of ZSM-5 Containing Framework Iron and Catalytic Performance of Supported Pt Catalysts in Dehydrogenation of n-Dodecane

1.
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
2.
Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China

Corresponding author: LI Ming-Shi, mingshili@cczu.edu.cn
Received Date: 16 December 2019
Revised Date: 12 March 2020

Figures(6)

The zeolite Na-[Fe]-ZSM-5 containing framework iron was successfully synthesized by hydrothermal synthesis, and the Pt/Na-[Fe]-ZSM-5 catalysts were prepared by ion exchange method. The catalytic performance of the catalysts for the dehydrogenation of long-chain alkanes to mono-olefin was investigated through the dehydrogenation of n-dodecane. The catalysts were characterized by N₂ adsorption-desorption test, X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), NH₃ temperature-programmed desorption (NH₃-TPD), Ir spectra of pyridine adsorped (Py-IR), CO chemisorption and transmission electron microscope (TEM). The results show that the surface acidity of the catalyst can be adjusted by controlling the content of framework iron; the support, ZSM-5 containing framework iron, has the effect of inhibiting metal grain growth and maintaining high dispersion of metals; The Pt/Na-[Fe]-ZSM-5-50 catalyst had weak surface acid sites (0.69 mmol·g^-1) and highly dispersed Pt sites, so it exhibited high activity and stability for the dehydrogenation and high selectivity of mono-olefin. When the conversion was stable at ~20%, the TOF was 4.56 s^-1 and the selectivity of mono-olefin was 92.7%. In the experimental range, the amount of weak acid sites on the surface of Pt/Na-[Fe]-ZSM-5 catalyst and its intrinsic activity (TOF) of dehydrogenation increased with the increase of iron content.
- zeolites,
- template synthesis,
- supported catalysts,
- framework iron,
- catalytic dehydrogenation,
- acidity
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沈阳化工大学材料科学与工程学院沈阳 110142