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Wyszukujesz frazę "MgF2" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Nanocolloidal Ru/MgF2 Catalyst for Hydrogenation of Chloronitrobenzene and Toluene
    Autorzy:
    Pietrowski, M.
    Zieliński, M.
    Wojciechowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779536.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ruthenium nanocolloidal catalyst
    magnesium fluoride
    toluene hydrogenation
    reduction of chloronitrobenzene
    Opis:
    The use of magnesium fluoride support for ruthenium active phase allowed obtaining new catalysts of high activities in the hydrogenation of toluene and ortho-chloronitrobenzene. Ruthenium colloid catalysts (1 wt.% of Ru) were prepared by impregnation of the support with the earlier produced polyvinylpyrrolidone (PVP)-stabilized ruthenium colloids. The performances of the colloidal catalysts and those obtained by traditional impregnation were tested in the reactions of toluene hydrogenation to methylcyclohexane and selective hydrogenation of ortho-chloronitrobenzene (o-CNB) to ortho-chloroaniline (o-CAN). It was shown that the use of chemical reduction method allows obtaining highly monodisperse ruthenium nanoparticles of 1.6–2.6 nm in size. After reduction in hydrogen at 400oC, the colloidal ruthenium nanoparticles were found to strongly interact with MgF2 surface (SMSI), which decreased the catalyst ability to hydrogen chemisorption, but despite this, the colloid catalysts showed higher activity in o-CNB hydrogenation and higher selectivity to o-CAN than the traditional ones. It is supposed that their higher activity can be a result of high dispersion of Ru in colloid catalysts and the higher selectivity can be a consequence of the lower availability of hydrogen on the surface.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 2; 63-68
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The GdF3/MgF2 bilayer as an antireflective narrow-band ultraviolet filter
    Autorzy:
    Marszałek, K.
    Małek, A.
    Winkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/173197.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    thin antireflective films
    GdF3
    MgF2
    UV filters
    Opis:
    The effective work of optical systems, applied in advanced optic and optoelectronic devices, requires antireflective coatings. In this work we focus on designing the bilayer system dedicated to work as a narrow-band filter within UV range of electromagnetic spectrum. Such coatings are applied in lasers where reduction in reflection to a small value at any single wavelength is needed. The bilayer system is based on GdF3 and MgF2 used as materials with middle and low refractive index. The multilayers were obtained by thermal evaporation on a highly purified CaF2 substrates. The spectral dispersion of the refractive index of single layers has been determined by ellipsometric measurements. Thicknesses of single layers included in the bilayer system, aimed to work at specific wavelength, have been optimized based on optical characteristics simulation, including experimentally measured values of the refractive indices. During the deposition, layer thickness and deposition rate were controlled with Inficon XTC/2 thickness measuring system. Optical properties of obtained GdF3/MgF2 bilayer systems have been determined based on spectral dependences of reflectance and transmittance measured with the application of a spectrophotometer. The crystal structure and phase composition of the films have been examined by X-ray diffraction. The result of studies revealed that proper optimization of thicknesses of individual layers creating GdF3/MgF2 bilayer systems makes it possible to obtain the antireflective coating for desired wavelength of electromagnetic spectrum. The GdF3/MgF2 antireflective bilayer will be applied as a narrow-band filter for 238 nm irradiation produced by gas-ion/BBO crystal laser.
    Źródło:
    Optica Applicata; 2016, 46, 2; 187-197
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Study between Energy Levels of $Cr^{3+}$ and $Co^{2+}$ Ions Doped in $MgF_{2}$ Crystal
    Autorzy:
    Nistora, R.
    Andreici, L.
    Avram, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791222.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ch
    42.70.Hj
    61.72.S-
    Opis:
    The aim of this paper is to present a comparison of the energy level schemes of $Cr^{3+}$ ($3d^{3}$ electrons) and $Co^{2+}$ ($3d^{7}$ electrons), each of ions doped, separately, in $MgF_{2}$ crystal. We report on the detailed and consistent crystal field analysis of $Cr^{3+}$ spectra in $MgF_{2}$ crystal and compare with results, previously obtained, for $Co^{2+}$, doped in same host matrix. The results are based on application of the exchange charge model of crystal field to the calculation of crystal field parameters and energy levels of both ions doped in $MgF_{2}$.The calculations have been performed on previously optimized geometry of $MgF_{2}$ crystal. The obtained results are compared with experimental data and discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 538-540
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure Characterization and Catalytic Properties of Cr$\text{}_{2}$O$\text{}_{3}$ Doped with MgO Supported on MgF$\text{}_{2}$
    Autorzy:
    Goslar, J.
    Wojciechowska, M.
    Zieliński, M.
    Tomska-Foralewska, I.
    Przystajko, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043607.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Fc
    68.43.Fg
    82.65.+r
    Opis:
    A characterization of double oxide systems containing Cr$\text{}_{2}$O$\text{}_{3}$ doped with MgO and supported on MgF$\text{}_{2}$ was carried out. The catalysts were prepared by impregnation and co-impregnation methods and characterized by the Brunauer-Emmett-Teller method, EPR, and temperature programmed reduction. The results proved the interactions between supported oxides and the presence of spinel-like phase after treatment at 400ºC. Magnesium oxide clearly influences the catalytic activity as well as selectivity of chromium catalysts supported on MgF$\text{}_{2}$. The MgO-Cr$\text{}_{2}$O$\text{}_{3}$/MgF$\text{}_{2}$ systems were active and selective in the reaction of CO oxidation at the room temperature and in the dehydrogenation of cyclohexene.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 323-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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