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  • Title: Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to ammonia.
    Author: Li L, Cai J, Liu Y, Ni J, Lin B, Wang X, Au CT, Jiang L.
    Journal: Sci Bull (Beijing); 2020 Jul 15; 65(13):1085-1093. PubMed ID: 36659160.
    Abstract:
    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.
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