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Updated: Aug 13, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Zeolite-seed-directed Ru nanoparticles highly resistant against sintering for efficient nitrogen activation to
Lingling Li1, Jihui Cai1, Yi Liu1
1National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China.
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 mmolNH gcat-1 h-1, which is much higher than that of Ru/ZSM-5-IWI (2.13 mmolNH 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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