期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 10, 页码 7254-7262出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.11.196
关键词
Methane dry reforming; Modified alumina; Calcina; Samarium promoter; Nickel catalyst
资金
- University of Semnan
In this study, the addition of samarium to Ni catalyst through impregnation method successfully decreased the average Ni crystallite size and specific surface area, resulting in improved catalytic activity, enhancing the methane dry reforming process.
Mesoporous calcina-modified alumina (Al2O3-CaO) support was produced through the simple and economical co-precipitation method, then nickel (Ni, 10 wt%) and samarium (Sm, 3 wt%) ions loaded by two-solvent impregnation and one-pot strategies. The unpromoted/samarium-promoted catalysts were evaluated using X-ray Diffraction (XRD), High-Resolution Transmission Electron Microscopy (HR-TEM), nitrogen adsorption-desorption, Temperature Programmed Oxidation/Reduction (TPR/TPO), and Field Emission Electron Scanning Microscopy (FE-SEM) methods, then investigated in methane dry reforming. The results revealed that with adding samarium to Ni catalyst through impregnation method, the average Ni crystallite size and specific surface area decreased from 11.5 to 5.75 nm and from 76.08 to 30.9 m(2)/g, respectively; as a result, the catalytic activity increased from about 50% to 68% at 700 degrees C. Furthermore, the TPO and FE-SEM tests indicated the formation of carbon with nanotube nature on the catalyst surface. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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