Adsorption/desorption studies of NOx on well-mixed oxides derived from Co-Mg/Al Hydrotalcite-like compounds

The Journal of Physical Chemistry. B
Jun Jie YuZhi Ping Xu

Abstract

CoxMg3-x/Al hydrotalcite-like compounds (where x=0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0) were synthesized by the coprecipitation method and characterized by the XRD and TGA techniques. Incorporation of Co for x=0.0-3.0 gradually decreased the transformation temperature of the hydrotalcites to the corresponding oxides from 444 to 246 degrees C and also decreased the surface area from 162.7 to 21.6 m2/g upon calcination at 800 degrees C for 4 h in air. The resultant oxide was generally composed of a poor MgO phase and a spinel phase, with more spinel phase at higher Co incorporation. The derived oxides were tested as the storage/reduction catalysts for NOx adsorption/desorption. The storage capacity for NOx was highly dependent on the catalyst composition and storage temperature. In general, more NOx was stored at lower temperature (100 degrees C) than that at higher temperature (300 degrees C), and tertiary catalysts (x=0.5-2.5) stored more NOx than binary catalyst (x=0.0 or 3.0). The catalytic conversion of NO to NO2 and the catalytic decomposition of NOx were observed on the tertiary catalysts during NOx adsorption at 300 degrees C, which was highly related to the loading of cobalt. The reducibility of catalysts was determined by T...Continue Reading

References

Mar 29, 2002·Environmental Science & Technology·J F BrilhacJ A Martens

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Citations

Jun 5, 2012·Journal of Environmental Sciences (China)·Jie ChengZhengping Hao
Apr 24, 2010·Chemical Communications : Chem Comm·Lianying WangDavid G Evans
Mar 2, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Bo LiXiaofeng Cao
Jun 15, 2017·Environmental Technology·Dingqi Li
Feb 7, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Ruoyu MaDianqing Li
Apr 3, 2020·Environmental Science and Pollution Research International·Dylan ChaillotJocelyne Brendlé
May 7, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Govinda KapusettiPralay Maiti
Aug 27, 2021·The Science of the Total Environment·Shanshan ShangJin Shang

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