期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 42, 期 7, 页码 4174-4183出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.10.141
关键词
CO2 methanation; Al2O3; Ni dispersion; Microwave
资金
- Assembly Foundation of The Industry and Information Ministry of the People's Republic of China [453]
- National Natural Science Foundation of China [51408309, 51578288]
- Science and Technology Support Program of Jiangsu Province [BE2014713]
- Natural Science Foundation of Jiangsu Province [BK20140777]
- Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province [BY2014004-10]
- Science and Technology Project of Nanjing [201306012]
- Jiangsu Province Scientific and Technological Achievements into a Special Fund Project [BA2015062]
- Priority Academic Program Development of Jiangsu Higher Education of Jiangsu Higher Education Institutions
The Ni dispersion of the catalysts is essential to the catalytic activity for CO2 methanation, which could be affected by preparation process and treatment method of the catalysts. Accordingly, a microwave-assisted method was used to synthesize Ni/Al2O3 catalysts (Ni20-Al2O3-M) because the microwave technique is an efficient route for high dispersion of inorganic salts onto supports. Polyvinyl pyrrolidone (PVP) and distilled water was used as surfactant and microwave absorbent to improve the dispersivity of Ni nanoparticles on gamma-Al2O3. The comparison catalyst (Ni20-Al2O3-I) was prepared with an impregnation method. XRD, Raman spectrum and HRTEM collectively confirmed the good Ni dispersion of Ni20-Al2O3-M, while H-2-TPR and CO2-TPD results indicated that the Ni20-Al2O3-M catalysts obtained more Ni active sites under low temperature of H-2 pretreatment and strengthened basicity. Therefore, the CO2 methanation activity over Ni20-Al2O3-M was evidently enhanced at lower temperature. The corresponding CH4 selectivity was also well maintained over the whole temperature region. Moreover, Ni20Al(2)O(3)-M showed good stability for CO2 methanation at 325 degrees C during the 72 h lifetime test. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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