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Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen
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Jabłońska, Magdalena, Chmielarz, Lucjan, Węgrzyn, Agnieszka, Guzik, Katarzyna, Piwowarska, Zofia, Witkowski, Stefan, Walton, Richard I., Dunne, P. D. and Kovanda, František (2013) Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen. Journal of Thermal Analysis and Calorimetry, Volume 114 (Number 2). pp. 731-747. doi:10.1007/s10973-012-2935-9 ISSN 1388-6150.
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Official URL: http://dx.doi.org/10.1007/s10973-012-2935-9
Abstract
Layered double hydroxides (LDHs) containing Mg2+, Cu2+ or Zn2+ cations in the MeII positions and Al3+ and Fe3+ in the MeIII positions were synthesized by co-precipitation method. Detailed studies of thermal transformation of obtained LDHs into metal oxide systems were performed using high temperature X-ray diffraction in oxidising and reducing atmosphere, thermogravimetry coupled with mass spectrometry and temperature-programmed reduction. The LDH samples calcined at 600 and 900 °C were tested in the role of catalysts for selective oxidation of ammonia into nitrogen and water vapour. It was shown that all copper congaing samples presented high catalytic activity and additionally, for the Cu–Mg–Al and Cu–Mg–Fe hydrotalcite samples calcined at 600 °C relatively high stability and selectivity to dinitrogen was obtained. An increase in calcination temperature to 900 °C resulted in a decrease of their catalytic activity, possibly due to formation of well-crystallised metal oxide phases which are less catalytically active in the process of selective oxidation of ammonia.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Journal of Thermal Analysis and Calorimetry | ||||
Publisher: | Akademiai Kiado Rt. | ||||
ISSN: | 1388-6150 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 114 | ||||
Number: | Number 2 | ||||
Page Range: | pp. 731-747 | ||||
DOI: | 10.1007/s10973-012-2935-9 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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