期刊
APPLIED CLAY SCIENCE
卷 129, 期 -, 页码 122-130出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2016.05.019
关键词
Hydrotalcite-like materials; Mixed metal oxides; Copper; NH3-SCO
资金
- European Regional Development Fund (Polish Innovation Economy Operational Program) [POIG.02.01.00-12-023/08]
Hydrotalcite originated Cu-Mg-Al mixed metal oxides were studied as catalysts for selective oxidation of ammonia to dinitrogen. Cu-Mg-Al hydrotalcite-like materials with copper content of 5 mol% and various molar Mg/Al ratios were synthetized by coprecipitation method and then calcined at 600, 700 and 800 degrees C. It was shown that both Mg/Al ratio as well as calcination temperature are very important synthesis parameters determining selectivity of the studied catalysts in ammonia oxidation process. The catalysts with lower Mg/Al ratio, so higher Al content, were more selective to dinitrogen. Moreover, it was shown that an increase in calcination temperature also resulted in the catalysts with a significantly improved selectivity to dinitrogen. These interesting effects were related to the formation of the Cu-containing spinel phases, which possibly are responsible for high selectivity to dinitrogen in the high temperature range. (C) 2016 Elsevier B.V. All rights reserved.
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