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Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39172 45810 2015 10 PDF Available
Title
Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation
Abstract

•NiO catalysts with different morphologies were prepared with different precipitants.•Mesoporous NiO-NaOH prepared with NaOH solution shows sheet-like morphology.•NiO-NaOH nano-sheet shows the highest CH4 oxidation activity.•The activity of NiO-NaOH is competitive to that of 0.5 wt.% Pd/Al2O3.•NiO-NaOH shows superior stability in both dry and wet feeds.

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. H2-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.

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Keywords
NiO catalysts; Nano-sheets; Nano-particles; CH4 oxidation; Ni2+ defects
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Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 507, 25 October 2015, Pages 109–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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