MFI分子筛限域Ru催化剂的制备及其丙烷催化燃烧性能

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Abstract Three Ru-based catalysts were synthesized using in-situ synthesis, impregnation, and deposition-precipitation methods in combination with MFI zeolites to investigate their catalytic oxidation activity toward propane (C₃H₈). The catalyst synthesized via the in-situ method, denoted as Ru@MFI, exhibited the highest low-temperature oxidation activity, achieving a 90% conversion rate at 270°C, along with remarkable thermal stability at high temperatures and hydrophobicity. Characterization techniques, including X-ray diffraction (XRD), N₂ adsorption-desorption, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and temperature-programmed desorption of CO (CO-TPD), revealed that Ru confined within the MFI zeolite channels possessed the smallest particle size and highest dispersion, thereby increasing the number of active Ru sites. Further characterization using Raman spectroscopy and hydrogen temperature-programmed reduction (H₂-TPR) indicated that interactions between Ru and the MFI framework led to a redistribution of charge around Ru or oxygen, enhancing the reduction capabilities. Consequently, the Ru@MFI catalyst demonstrated superior propane oxidation activity. Additionally, the geometric confinement within the MFI channels maintained the stability and dispersion of Ru species during high-temperature calcination, effectively preventing Ru aggregation and further ensuring the catalyst's high-temperature thermal stability.

Key words： MFI confined noble metals Ru@MFI propane catalytic oxidation dispersion of active sites high-temperature thermal stability

Received: 07 June 2024

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X511

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	WANG Jing-jing
	XIA Liang-hui
	WU Ya-ni
	LIU Yu-jie
	XU He
	LIU Qi-yuan
	LIU Ji-chen
	JIAN Yan-fei
	HE Chi

Cite this article:

WANG Jing-jing,XIA Liang-hui,WU Ya-ni等. Synthesis of Ru confined in MFI zeolites catalyst and its study on the catalytic combustion performance of propane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 58-65.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/58

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