DOI: 10.1016/j.scib.2020.02.010
论文题名: Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia
作者: Li L. ; Cai J. ; Liu Y. ; Ni J. ; Lin B. ; Wang X. ; Au C.-T. ; Jiang L.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 13 起始页码: 1085
结束页码: 1093
语种: 英语
中文关键词: 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)
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169954
Appears in Collections: 气候变化与战略
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作者单位: National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, 350002, China
Recommended Citation:
Li L.,Cai J.,Liu Y.,et al. Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia[J]. Science Bulletin,2020-01-01,65(13)