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Study on CuO–CeO 2 /SiC catalysts in the sulfur–iodine cycle for hydrogen production
Author(s) -
Yang Hui,
Zhang Yanwei,
Zhou Junhu,
Wang Zhihua,
Liu Jianzhong,
Cen Kefa
Publication year - 2016
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3500
Subject(s) - high resolution transmission electron microscopy , x ray photoelectron spectroscopy , materials science , catalysis , transmission electron microscopy , cerium , temperature programmed reduction , copper , scanning electron microscope , chemical engineering , analytical chemistry (journal) , inorganic chemistry , nanotechnology , chemistry , metallurgy , composite material , biochemistry , chromatography , engineering
Summary The structure and activity of ceria–copper oxides supported on nanometer silicon carbide (nano‐SiC) particles for sulfuric acid decomposition were studied. The promoting activities and stabilities of CuO–CeO 2 complex oxides loaded on nano‐SiC grains were prominently higher than those of CuO–CeO 2 without carriers, especially at <800 °C. The results of X‐ray diffraction (XRD), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM) showed that copper‐cerium composite oxides grains were well dispersed and fixed on the surface of SiC particle, and the average sizes of CuO–CeO 2 complex oxides carried by SiC particles were considerably smaller than those of CuO–CeO 2 without carriers. Based on the analysis of HRTEM images, X‐ray photoelectron spectroscopy (XPS) spectra, and infrared radiation (IR) pattern, the majority of SiC surfaces were converted to SiO 2 layers, in which CeO 2 grains immobilized by coordination bonding Ce–O–Si bridges. From the temperature programmed reduction (TPR) patterns, compared with those of CuO–CeO 2 without carrier, the reduction temperature of CuO to Cu 2 O in CuO–CeO 2 /SiC catalysts was lowered, especially at (Ce + Cu)/SiC atomic ratio of 5 mol.%. The catalysts also showed relatively high activities at 727 °C for 20 h of continuous operation. A mechanism of SO 3 decomposition on CuO–CeO 2 /SiC was proposed according to the characterization results. Copyright © 2016 John Wiley & Sons, Ltd.