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Wyszukujesz frazę "Pełech, S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Synthesis and characterization of Pt/CeO$\text{}_{x}$ systems for catalytic CO oxidation reaction
Autorzy:
Wróbel, R.
Łagonda, S.
Narkiewicz, U.
Pełech, R.
Becker, S.
Szymaszkiewicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/2080016.pdf
Data publikacji:
2011-01-01
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
Four different ceria supported catalyst were prepared by impregnation method with Pt(NO$\text{}_{3}$)$\text{}_{2}$ solution. The two supports are commercially available (MaTeck) and the other two were prepared by precipitation and microwave assisted hydrothermal method (MAH) respectively. The phase composition and average crystallite size of the catalysts were characterised with XRD technique. Finally the catalytic activity in CO oxidation reaction were determined in plug flow reactor in temperature range 300-900 K with 1 K resolution. The catalysts obtained in both precipitation and MAH methods exhibit catalytic activity at room temperature whereas catalysts obtained on MaTeck supports are not active at those conditions. In turn, catalysts based on MaTeck support are more active in temperature range 420-700 K. The different activities are attributed to difference in average crystallite sizes and in support morphology.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2011, 66; 37-46
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Pressure Synthesis versus Calcination – Different Approaches to Crystallization of Zirconium Dioxide
Autorzy:
Kaszewski, J.
Yatsunenko, S.
Pełech, I.
Mijowska, E.
Narkiewicz, U.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/779250.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
microwave
hydrothermal technology
zirconium dioxide
calcination
Opis:
Calcination and microwave-assisted hydrothermal processing of precipitated zirconium dioxide are compared. Characterization of synthesized products of these two technologies is presented. The infiuence of thermal treatment up to 1200oC on the structural and spectroscopic properties of the so-obtained zirconium dioxide is examined. It was found that initial crystallization of material inhibits the crystal growth up to the 800oC (by means of XRD and TEM techniques), while the material crystallized from amorphous hydroxide precursor at 400oC, exhibits 26 nm sized crystallites already. It was found using the TG technique that the temperature range 100–200oC during the calcination process is equivalent to a microwave hydrothermal process by means of water content. Mass loss is estimated to be about 18%. Based on X-ray investigations it was found that the initial hydroxide precursor is amorphous, however, its luminescence activity suggests the close range ordering in a material.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 2; 99-105
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence and Chromaticity Properties of ZnO Nanopowders Made by a Microwave Hydrothermal Method
Autorzy:
Wolska, E.
Sibera, D.
Witkowski, B.
Yatsunenko, S.
Pełech, I.
Narkiewicz, U.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492917.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.-n
61.43.Gt
81.07.Wx
78.55.Et
Opis:
Four series of ZnO nanopowders obtained by a microwave hydrothermal method are examined. Two different solvents (ethanol and distilled water) and different values of pressure during heating in the reactor were used. The obtained nanopowders show a bright emission covering visible light spectral region, including the band edge emission. Results of scanning electron microscopy, X-ray diffraction, photo- and cathodoluminescence investigations and also CIE1961 chromaticity diagram are presented.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 908-910
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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