A comparative study of N2O conversion to N-2 over Co/AC and Cu/AC catalysts

Zhu, Z. H., Lu, G. Q. M., Zhuang, Y. H. and Shen, D. X. (1999) A comparative study of N2O conversion to N-2 over Co/AC and Cu/AC catalysts. Energy & Fuels, 13 4: 763-772.


Author Zhu, Z. H.
Lu, G. Q. M.
Zhuang, Y. H.
Shen, D. X.
Title A comparative study of N2O conversion to N-2 over Co/AC and Cu/AC catalysts
Journal name Energy & Fuels   Check publisher's open access policy
ISSN 0887-0624
Publication date 1999
Sub-type Article (original research)
DOI 10.1021/ef980181e
Volume 13
Issue 4
Start page 763
End page 772
Total pages 10
Place of publication USA
Publisher American Chemical Society
Collection year 1999
Language eng
Subject C1
250102 Chemistry of Catalysis
659900 Other
Abstract Catalytic conversion of N2O to N-2 over Cu- and Co-impregnated activated carbon catalysts (Cu/AC and Co/AC) was investigated. Catalytic activity measurements were carried out in a fixed-bed flow reactor at atmospheric pressure. The catalysts were characterized by N-2 adsorption, X-ray diffraction (XRD) and thermogravimetric analysis (TGA). This study aimed to provide insights into the following aspects: the metal dispersion, changes in pore structure, influence of catalyst loading on reaction, and reaction mechanism. Increasing loading of Co or Cu led to decreasing dispersion, but 20 wt % loading was an upper limit for optimal activities in both cases, with too high loading causing sintering of metal. Co exhibited a relatively better dispersion than Cu. Impregnation of metal led to a large decrease in surface area and pore volume, especially for 30 wt % of loading. 20 wt % of loading has proved to be the optimum for both Cu and Co, which shows the highest activity. Both N2O-Co/AC and -Cu/AC reactions are based upon a redox mechanism, but the former is limited by the oxygen transfer from catalysts to carbon, while N2O chemisorption on the surface of Cu catalyst controls the latter. The removal of oxygen from cobalt promotes the activity of Co/AC, but it is beneficial for Cu/AC to keep plenty of oxygen to maintain the intermediate oxidation of copper-Cu1+. The different nature of the two catalysts and their catalytic reaction mechanisms are closely related to their different electronegativities.
Keyword Energy & Fuels
Engineering, Chemical
Fluidized-bed Combustion
No Reduction
Activated Carbons
Nitrous-oxide
Transition-metals
Surface-area
Decomposition
Monoxide
Oxygen
Co
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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