Please use this identifier to cite or link to this item:
|Title:||Low-temperature synthesis of Mg(x)Co(1-x)Co2O4 spinel catalysts for N2O decomposition|
|Source:||Chellam, U., Xu, Z.P., Zeng, H.C. (2000). Low-temperature synthesis of Mg(x)Co(1-x)Co2O4 spinel catalysts for N2O decomposition. Chemistry of Materials 12 (3) : 650-658. ScholarBank@NUS Repository. https://doi.org/10.1021/cm990355l|
|Abstract:||Low-temperature synthesis of spinels Mg(x)Co(1-x)Co2O4 (x = 0.0-0.9) has been investigated with two important synthetic parameters and XRD/FTIR/DSC/BET/ICP/CHN methods. It is found that with an increase in hydrothermal treatment temperature, precursor compounds change from the hydrotalcite-like to brucite-like and then to cubic spinel phase when the initial metal concentration ratio [Mg2+]:[Co2+]≥ 1, while from the turbostratic to hydrotalcite-like and then to cubic spinel phase when the [Mg2+]:[Co2+] < 1. The Mg(x)Co(1-x)Co2O4 (x ≤ 1/3) spinels were formed at temperatures as low as 50-100 °C. In the postsynthesis thermal treatment, various thermal events have been observed, and in all cases the spinel phase can be prepared at temperatures below 300 °C. On the basis of FTIR results, a topotactic mechanism for the formation of the spinel phase has been confirmed. Specific surface area as high as 210 m2/g has been attained in 400 °C calcined Mg(x)Co(1-x)Co2O4 with x = 0.9. Causes for the formation of the spinel phase at low temperatures have been addressed. Excellent catalytic activity for N2O decomposition (30.6-38.9 mmol (N2O)/g·h at GHSV = 21200 h-1 and 380-400 °C; N2O = 10 mol % balanced with He) has been observed and discussed for these Mg - Co spinels.|
|Source Title:||Chemistry of Materials|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 7, 2018
WEB OF SCIENCETM
checked on Nov 22, 2017
checked on Mar 10, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.