期刊
JOURNAL OF CO2 UTILIZATION
卷 15, 期 -, 页码 146-153出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2016.05.007
关键词
Ni; SiO2; Calcination; Hydrogen; Dry reforming of methane
资金
- National University of Singapore [R279000407112]
- NEA (NEA-ETRP Grant) [1002114, 279-000-333-490]
A novel sequential treatment method (hydrogen treatment prior to air calcination) was used to prepare Ni/SiO2 catalysts by incipient wetness impregnation (IWI). This catalyst showed a uniform and small Ni particle size (d = 2.5 +/- 0.8 nm) and a strong metal-support interaction (T-R approximate to 670 degrees C), yielding an excellent catalytic performance (85% for CO2 conversion and 80% for CH4 conversion) with negligible metal sintering and no carbon deposition over 100-h dry reforming of methane (DRM) reaction. The first-step hydrogen treatment removed the oxygen radicals produced from the decomposition of Ni nitrate and the second-step air calcination stabilized Ni nanoparticles by forming Ni (phyllo) silicate structure. Therefore, the sequential calcination method produced small, uniform and highly dispersed Ni nanoparticles, strong metal-support interaction and excellent catalytic performances for DRM reaction. (C) 2016 Elsevier Ltd. All rights reserved.
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