Journal
APPLIED CATALYSIS A-GENERAL
Volume 507, Issue -, Pages 109-118Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2015.09.023
Keywords
NiO catalysts; Nano-sheets; Nano-particles; CH4 oxidation; Ni2+ defects
Categories
Funding
- Natural Science Foundation of China [21263015]
- Education Department of Jiangxi Province [KJLD14005]
- Natural Science Foundation of Jiangxi Province [20151BBE50006, 20122BAB203009]
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A series of polycrystalline NiO catalysts with different morphologies have been prepared in this study with a simple precipitation method by changing the precipitants, and used for CH4 deep oxidation. NiO-NaOH, a sample prepared with NaOH solution, displays the highest CH4 oxidation activity among all the catalysts, which is competitive to that of 0.5 wt.% Pd/Al2O3, especially at high WHSV. SEM demonstrates that it consists of uniform nano-sheets with an average thickness around 23 nm. Compared with other two samples composed of irregular nano-particles, this nano-sheet mesoporous sample possesses higher surface area, larger pore volume and pore size. H-2-TPR demonstrates that it also contains less Ni3+ cations, which are found to be harmful to the activity. Furthermore, it is revealed that more active oxygen species has been formed on the surface of this nano-sheet sample. As a result, NiO-NaOH shows the highest CH4 oxidation activity among all the NiO catalysts. Water vapour has no any negative effect on the activity of NiO-NaOH, as testified by the long-term stability test in the presence of water vapour. (C) 2015 Elsevier B.V. All rights reserved.
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