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    Wyświetlanie 1-7 z 7
    Tytuł:
    Nanosilver: a catalyst in enzymatic hydrolysis of starch
    Autorzy:
    Falkowska, M.
    Molga, E. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/778563.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanocatalyst
    starch degradation
    nanosilver
    Opis:
    Silver nanoparticles are widely used, because of their antimicrobial properties. In this paper, the rate of starch digestion in the presence of nanocatalyst was compared with the rate of reaction without nanosilver. The rate of enzymatic degradation of starch was found to be increased in the presence of silver nanoparticles. It is considered that α-amylase was immobilized onto the surface of nanoparticles.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 111-113
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reusable Nanocatalyst: Zirconia and Sulfated Zirconia
    Autorzy:
    Gondaliya, M. B.
    Maheta, T.
    Mamtora, M. J.
    Shah, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411589.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nanocatalyst
    nanoparticles
    Sulfated Zirconia
    synthesis
    Benzodiazepines
    solid catalyst
    solvent-free
    green chemistry
    Opis:
    1,5-benzodiazepines have been synthesized by Nano Zirconia and Nano Sulfated Zirconia in solvent free conditions. Synthesis was carried out by conventional as well as microwave method. Benzodiazepines were synthesized by reacting o-phenylenediamine and few ketones in the presence of catalytic amount of Nanoparticles. Particles used were sized in between 53-100 nm. Nanoparticles were characterized by FT-IR, DLS and powder XRD analysis.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 295-302
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of iron oxide nanocatalysts and application in the liquid phase oxidation of benzene
    Autorzy:
    Lokhat, D.
    Oliver, M.
    Carsky, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779676.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Iron oxide nanocatalyst
    benzene
    oxidation
    phenol
    liquid phase
    Opis:
    A series of iron oxide nanocatalysts were prepared using an ultrasonically assisted co-precipitation technique. Molybdenum promoted Fe3O4 and Fe2O3 were prepared from the original materials by wet impregnation using a solution of ammonium molybdate. The catalysts were tested in the liquid phase oxidation of benzene at atmospheric pressure and at 60°C using molecular oxygen. Phenol yields between 7% and 14.5% were obtained. The major products were pyrogallol and catechol.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 43-46
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and effects of substituent on (E)-styryl-3-methyl-2-thienyl chalcones
    Autorzy:
    Christuraj, P.
    Geetha, C.
    Vanangamudi, G.
    Arulkumaran, R.
    Manikandan, V.
    Rajakumar, P. R.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1161056.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones
    FT-IR & NMR spectra
    Fly-ash:H3PO4 nanocatalyst
    Hammett correlation analysis
    Substituent effects
    UV
    solvent-free synthesis
    Opis:
    Series of eleven substituted of (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones compounds by cross-aldol condensation reaction of 3-methylthiophene-2-carbaldehyde with various substituted acetaldehyde in the occurrence of Fly-Ash: H3PO4 catalyst. The effect of catalytic activity of this fly-ash:H3PO4 nanocatalyst was studied with the obtained yield of products under solvent-free conditions. The synthesized substituted (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-one compounds was characterized by physical constants, UV, FT-IR, 1H & 13C-NMR spectral data. The infrared group frequencies of ʋ(cm-1) of COs-cis & s-trans, CHip and CHop, CH=CHop, >C=C
    Źródło:
    World Scientific News; 2018, 112; 55-73
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Benzimidazole Using Reusable Nanocatalyst Zirconia and Sulfated Zirconia
    Autorzy:
    Pashavan, Chandankumar T.
    Gondaliya, Mitesh B.
    Shah, Manish K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076115.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Benzimidazole
    Nanocatalyst
    Reuseble
    Sulfated Zirconia
    Opis:
    Benzimidazole derivatives have been synthesized by solid Nanocatalysts Zirconia and Sulfated Zirconia with Green reusablity method. Synthesis of benzimidazole was carried out by conventional as well as microwave method. Synthesis carried out by reacting o-phenylenediamine and few aldehydes in the presence of catalytic amount of Nanoparticles. Particles used were sized in between 53-100 nm. Nanoparticles and synthesized benzimidazole derivatives were characterized by DLS, powder XRD, SEM-EDX andMass, CHNS, FT-IR, NMR analysis respectively.
    Źródło:
    World Scientific News; 2019, 117; 235-242
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SCMNPs@Uridine/Zn: An efficient and reusable heterogeneous nanocatalyst for the rapid one-pot synthesis of tricyclic fused pyrazolopyranopyrimidine and 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives under solvent-free conditions
    Autorzy:
    Wei, Jia
    Gui, Wenjun
    Cui, Yanjun
    Zhang, Zhifang
    Yousif, Qahtan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778587.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanocatalyst
    synthesis of tricyclic
    carboxylate
    efficient heterogeneous
    Opis:
    SCMNPs@Uridine/Zn is utilized as an environmental-friendly and efficient heterogeneous nanocatalyst for two one-pot four-component condensation reactions, containing hydrazine hydrate, arylaldehyde, ethyl acetoacetate, and barbituric acid to yield tricyclic fused pyrazolopyranopyrimidine derivatives (5a-q), and hydrazine hydrate, arylaldehyde, malononitrile, and dimethyl acetylenedicarboxylate/diethyl acetylenedicarboxylate to yield 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives (8a-y) under solvent-free conditions with high to excellent yields. The main advantages of this process are easy work-up, short reaction times, no chromatographic purifications, and recyclability of the catalyst for a minimum of six runs without any signifcant decrease in yields of the products. Also, the prepared catalyst SCMNPs@Uridine/Zn was synthesized and fully characterized by various techniques including Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Raman spectroscopy.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 2; 20-33
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic of Oil Sludge Thermolysis Process in Presence of Nickel, Cobalt and Iron-Supported Microsilicate
    Autorzy:
    Tyanakh, Sairagul
    Baikenov, Murzabek
    Yun, Ma Feng
    Khamitova, Tolkyn
    Balpanova, Nazerke
    Tulebayeva, Balzhan
    Kyzkenova, Aikorkem
    Karimova, Aliya
    Rakhimzhanova, N.Z.
    Kochegina, E.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315657.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    thermokinetic parameters
    thermogravimetry
    kinetics
    nanocatalyst
    microsilicate
    oil sludge
    iron
    nickel
    cobalt
    Opis:
    The article is devoted to the experimental determination of thermokinetic parameters of oil sludge thermal degradation using the model-free Ozawa-Flynn-Wall method in the presence of a nanocatalyst (nickel, cobalt and iron-supported microsilicate) by calculating Arrhenius kinetic parameters (activation energy and pre-exponential factor). The phase composition of the reflex microsilicate was established – 4.12; 2.51 Å – SiO2, nickel-supported microsilicate reflexes: 2.09; 1.48 Å – NiO, reflexes: 4.25 Å – SiO2 and acid numbers of microsilicate – 64 μmol/g of prepared nanocatalysts. Using the method of Brunauer, Emmett and Teller, the specific surface area of the microsilicate was established – 18.3 ± 0.3 m2 /g, the microsilicate with nickel applied – 20.9 ± 0.2 m2 /g and the adsorption isotherm of the prepared nanocatalysts (microsilicate with nickel, cobalt and iron). Thermokinetic parameters of thermal decomposition of oil sludge without a catalyst and with a catalyst at an increment of 0.9 are 99.0 and 93.3 kJ/mol nickel-supported microsilicate, 51.9 kJ/mol cobalt-supported microsilicate, 111.3 kJ/mol iron-supported microsilicate and non-metal-supported microsilicate 173.7 kJ/mol, respectively. The study of the kinetic parameters of pyrolysis of oil sludge using various catalysts makes it possible to assess their influence on the process of decomposition of organic components. The results of the experiments showed that the use of catalysts significantly affects the destruction of oil sludge. Dynamic thermal analysis at different heating rates studied the dynamics of oil sludge decomposition. The study of the effect of catalysts on the kinetic parameters of oil sludge pyrolysis is an important step in the development of new methods for the disposal of petroleum products and the reduction of their negative impact on the environment. The obtained experimental data on thermal degradation kinetics of oil sludge will find application in designing a reactor for the process of destructive hydrogenation of heavy hydrocarbon raw materials.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 3; 101--109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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