气候变化领域集成服务门户(CCPortal): Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia

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DOI	10.1016/j.scib.2020.02.010
	Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia
	Li L.; Cai J.; Liu Y.; Ni J.; Lin B.; Wang X.; Au C.-T.; Jiang L.
发表日期	2020
ISSN	20959273
起始页码	1085
结束页码	1093
卷号	65 期号:13
英文摘要	To stabilize Ru nanoparticles against sintering is an urgent problem in the utilization of Ru-based catalysts for NH3 synthesis. In the present study, we used Ru-containing ZSM-5 as seeds to crystallize ZSM-5, and the resulted Ru@ZSM-5 catalyst is highly resistant against Ru sintering. According to the results of diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and transmission electron microscopy (TEM) analyses, the average size of Ru nanoparticles is around 3.6 nm, which is smaller than that of Ru/ZSM-5-IWI prepared by incipient wetness impregnation. In NH3 synthesis (N2:H2 = 1:3) at 400 °C and 1 MPa, Ru@ZSM-5 displays a formation rate of 5.84 mmolNH3 gcat−1 h−1, which is much higher than that of Ru/ZSM-5-IWI (2.13 mmolNH3 gcat−1 h−1). According to the results of TEM, N2-temperature-programmed desorption (N2-TPD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) studies, it is deduced that the superior performance of Ru@ZSM-5 is attributable to the small particle size and the ample existence of metallic Ru0 sites. This method of zeolite encapsulation is a feasible way to stabilize Ru nanoparticles for NH3 synthesis. © 2020 Science China Press
关键词	Ammonia synthesis Ru particle size Ru-containing ZSM-5 seed Seed-directed synthesis Sinter-resistant Ru nanoparticles
英文关键词	Ammonia; Catalysts; Fourier transform infrared spectroscopy; High resolution transmission electron microscopy; Nanoparticles; Nitrogen; Particle size; Particle size analysis; Ruthenium; Sintering; Temperature programmed desorption; X ray absorption; X ray photoelectron spectroscopy; Zeolites; Ammonia synthesis; Diffuse reflectance infrared fourier transform spectroscopies; Incipientwetness impregnation; Nitrogen activation; Ru nanoparticles; Seed-directed synthesis; X ray absorption fine structures; ZSM-5 seeds; Synthesis (chemical)
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207098
作者单位	National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, 350002, China
推荐引用方式 GB/T 7714	Li L.,Cai J.,Liu Y.,et al. Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia[J],2020,65(13).
APA	Li L..,Cai J..,Liu Y..,Ni J..,Lin B..,...&Jiang L..(2020).Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia.Science Bulletin,65(13).
MLA	Li L.,et al."Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia".Science Bulletin 65.13(2020).