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Materials 2017, 10(11), 1326; doi:10.3390/ma10111326

Novel Montmorillonite/TiO2/MnAl-Mixed Oxide Composites Prepared from Inverse Microemulsions as Combustion Catalysts

1
Jerzy Haber Institute of Catalysis and Surface Chemistry, Niezapominajek 8, 30-239 Krakow, Poland
2
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Received: 30 October 2017 / Revised: 17 November 2017 / Accepted: 17 November 2017 / Published: 19 November 2017
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Abstract

A novel design of combustion catalysts is proposed, in which clay/TiO2/MnAl-mixed oxide composites are formed by intermixing exfoliated organo-montmorillonite with oxide precursors (hydrotalcite-like in the case of Mn-Al oxide) obtained by an inverse microemulsion method. In order to assess the catalysts’ thermal stability, two calcination temperatures were employed: 450 and 600 °C. The composites were characterized with XRF (X-ray fluorescence), XRD (X-ray diffraction), HR SEM (high resolution scanning electron microscopy, N2 adsorption/desorption at −196 °C, and H2 TPR (temperature programmed reduction). Profound differences in structural, textural and redox properties of the materials were observed, depending on the presence of the TiO2 component, the type of neutralization agent used in the titania nanoparticles preparation (NaOH or NH3 (aq)), and the temperature of calcination. Catalytic tests of toluene combustion revealed that the clay/TiO2/MnAl-mixed oxide composites prepared with the use of ammonia showed excellent activity, the composites obtained from MnAl hydrotalcite nanoparticles trapped between the organoclay layers were less active, but displayed spectacular thermal stability, while the clay/TiO2/MnAl-mixed oxide materials obtained with the aid of NaOH were least active. The observed patterns of catalytic activity bear a direct relation to the materials’ composition and their structural, textural, and redox properties. View Full-Text
Keywords: montmorillonite/hydrotalcite composite; montmorillonite/titania composite; organoclay; inverse micelle; Mn-Al mixed oxide; combustion catalysts montmorillonite/hydrotalcite composite; montmorillonite/titania composite; organoclay; inverse micelle; Mn-Al mixed oxide; combustion catalysts
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Napruszewska, B.D.; Michalik-Zym, A.; Rogowska, M.; Bielańska, E.; Rojek, W.; Gaweł, A.; Wójcik-Bania, M.; Bahranowski, K.; Serwicka, E.M. Novel Montmorillonite/TiO2/MnAl-Mixed Oxide Composites Prepared from Inverse Microemulsions as Combustion Catalysts. Materials 2017, 10, 1326.

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