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2017 | 132 | 1 | 38-44
Article title

EPR Study of Dealuminated HY Zeolite and Silica Containing Cu-Mn-Zn Spinels: The Effect of Support

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EN
A mixture of antiferromagnetic Cu_{1.4}Mn_{1.6}O₄ and Cu_{0.5}Zn_{0.5}Mn₂O₄ or/and ZnMn₂O₄ spinels was prepared. Dealuminated HY zeolite and silica were doped by these Cu-Mn-Zn spinels. The materials were investigated by X-ray diffraction, the Fourier transform infrared spectroscopy and EPR spectroscopy. Additionally, all the samples were tested for their activity for isopropyl alcohol dehydration/dehydrogenation. Three EPR signals were observed for Cu-Mn-Zn/dealuminated HY and Cu-Mn-Zn/SiO₂ samples at 293 K. In contrast to the spectra recorded at 293 K, only one broad line attributed to Cu-Mn-Zn spinels was visible at 77 K. The EPR signal from pure Cu-Mn-Zn spinels consists only of a single broad line when recorded at 293 K, whereas at 77 K the line is narrower. For all samples subjected to evacuation at high vacuum up to 573 K, the Cu-Mn-Zn spinels were stable. The evacuation at 673 K resulted in a rapid lowering of the intensity of EPR spectrum.
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author
  • Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland
  • University of Zielona Góra, Faculty of Physics and Astronomy, Institute of Physics, Z. Szafrana 4a, 65-516 Zielona Góra, Poland
  • Institute of Molecular Physics, Polish Academy of Sciences, Division of Physics of Dielectrics and Molecular Spectroscopy, M. Smoluchowskiego 17, 60-179 Poznań, Poland
  • University of Zielona Góra, Faculty of Physics and Astronomy, Institute of Physics, Z. Szafrana 4a, 65-516 Zielona Góra, Poland
author
  • Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland
author
  • Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland
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Document Type
Publication order reference
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bwmeta1.element.bwnjournal-article-appv132n1p08kz
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