Hydrotalcite-derived Co-containing mixed metal oxide catalysts for methanol incineration

The Co-Mg-Al mixed metal oxides were prepared by calcination of co-precipitated hydrotalcite-like precursors at various temperatures (600-800 °C), characterised with respect to chemical (AAS) and phase (XRD) composition, textural parameters (BET), form and aggregation of cobalt species (UV-vis-DRS)...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2017-09, Vol.129 (3), p.1301-1311
Main Authors: Basag, Sylwia, Kovanda, Frantisek, Piwowarska, Zofia, Kowalczyk, Andrzej, Pamin, Katarzyna, Chmielarz, Lucjan
Format: Article
Language:English
Subjects:
Agglomeration
Aluminum
Anabolic steroids
Carbon dioxide
Catalysts
Catalytic activity
Cobalt
Combustion
Incineration
Magnesium
Mass spectrometry
Metal oxides
Methanol
Phase (cyclic)
Roasting
Selectivity
Spinel
Spinel group
Thermal decomposition
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Summary:The Co-Mg-Al mixed metal oxides were prepared by calcination of co-precipitated hydrotalcite-like precursors at various temperatures (600-800 °C), characterised with respect to chemical (AAS) and phase (XRD) composition, textural parameters (BET), form and aggregation of cobalt species (UV-vis-DRS) and their redox properties (H.sub.2-TPR, cyclic voltammetry). Moreover, the process of thermal decomposition of hydrotalcite-like materials to mixed metal oxide systems was studied by thermogravimetric method combined with the analysis of gaseous decomposition products by mass spectrometry. Calcined hydrotalcite-like materials were tested as catalysts for methanol incineration. Catalytic performance of the oxides depended on cobalt content, Mg/Al ratio and calcination temperature. The catalysts with lower cobalt content, higher Mg/Al ratio and calcined at lower temperatures (600 or 700 °C) were less effective in the process of methanol incineration. In a series of the studied catalysts, the best results, with respect to high catalytic activity and selectivity to CO.sub.2, were obtained for the mixed oxide with Co:Mg:Al molar ratio of 10:57:33 calcined at 800 °C. High activity of this catalyst was likely connected with the presence of a Co-Mg-Al spinel-type phases, containing easy reducible Co.sup.3+ cations, formed during high-temperature treatment of the hydrotalcite-like precursor.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-017-6348-7