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Wyszukujesz frazę "nickel catalyst" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Nickel catalyst in coupled plasma-catalytic system for tar removal
    Autorzy:
    Woroszył-Wojno, Joanna
    Młotek, Michał
    Ulejczyk, Bogdan
    Krawczyk, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1849320.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    gliding discharge
    plasma-catalytic system
    tar decomposition
    nickel catalyst
    Opis:
    Tar formation is a significant issue during biomass gasification. Catalytic removal of tars with the use of nickel cata-lyst allows to obtain high conversion rate but coke formation on catalysts surface lead to its deactivation. Toluene decomposition as a tar imitator was studied in gliding discharge plasma-catalytic system with the use of 5%, 10% and 15% by weight Ni and NiO catalyst on Al2O3 (α-Al2O3) and Peshiney (γ-Al2O3) carrier in gas composition similar to the gas after biomass pyrolysis. The optimal concentration of nickel was identified to be 10% by weight on Al2O3. It was stable in all studiedinitial toluene concentrations, discharge power while C7H8 conversion rate remained high – up to 82%. During the process, nickel catalysts were deactivated by sooth formation on the surface. On catalysts surface, toluene decomposition products were identified including benzyl alcohol and 3-hexen-2-one.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 3; 24-29
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dry and steam reforming of methane. Comparison and analysis of recently investigated catalytic materials. A short review.
    Autorzy:
    Summa, Paulina
    Samojeden, Bogdan
    Motak, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/779028.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dry methane reforming
    steam methane
    reforming
    nickel catalyst
    hydrotalcite
    Opis:
    In order to produce valuable syngas, industrial processes of dry reforming of methane and steam reforming of methane must be further developed. This paper is focused on reviewing recently examined catalysts, supporting the mentioned technologies. In both processes the most popular active material choice is usually nickel, due to its good availability. On the other hand, noble metals, such as ruthenium, rhodium or platinum, provide better performance, however the solution is not cost-effective. Materials used as a support influence the catalytic activity. Oxides with basic properties, such as MgO, Al2 O3 , CeO2 , are frequently used as carriers. One of the most promising materials for reforming of methane technologies are hydrotalcites, due to adjustable composition, acid-base properties and possibility of incorporation of various metals and complexes.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 2; 31-37
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of alkaline promoters on the properties of the Ni/HAp catalyst in the methane dry reforming reaction
    Autorzy:
    Cichy, Marcin
    Zawadzki, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/29521159.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrogen
    synthesis gas
    nickel catalyst
    dry reforming
    coking
    alkaline promoter
    Opis:
    The reforming of methane with carbon dioxide is still of great interest due to the ever-increasing demand for synthesis gas and hydrogen. This process makes it possible to use two major gases that are considered harmful to the environment. The main problem for its commercial application is the lack of a catalyst that is both active, selective towards syngas (a mixture of hydrogen and carbon monoxide) and resistant to deactivation by coke deposition. Nickel is the most commonly used metal in methane reforming reactions due to its high activity and reasonable price. But still there is a gap in the literature for research on novel catalysts and their properties modifications devoted to strategies to reduce deactivation of the catalysts caused by the coke formation. In the present work a series of hydroxyapatite supported nickel catalysts promoted by alkali metals (Li, Na, K and Cs) were tested. The surface and structural properties of the catalysts were well characterized by physicochemical methods. Activity and selectivity were measured at 600ºC for 20 hours’ time-on-stream test. Resistance to coking was measured with Magnetic Suspension Balance. The stability of the catalyst was improved by the addition of promoters, which reduced the rate of coking. In particular, the cesium-promoted Ni/HAp catalyst significantly inhibited coke deposition, while slightly reducing methane conversion and selectivity to hydrogen.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 182856
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparing the cocoa butter replacer by fractional crystallisation of hydrogenated rapeseed oil
    Autorzy:
    Pawlowicz, R.
    Drozdowski, B.
    Hazuka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372546.pdf
    Data publikacji:
    1996
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    fat industry
    hydrogenation
    crystallization
    cocoa butter
    fat chemistry
    nickel catalyst
    sulphur-modified nickel
    rapeseed oil
    Opis:
    The rapeseed oil was hydrogenated with sulphur modified nickel catalyst. The parameters of hydrogénation process were found not to affect the physical properties of fats having the same hydrogénation degree. The conditions of fractional crystallisation from acetone of hydrogenated rapeseed oil were optimised for a high yield of the fat replacing cocoa butter. At 22°C and 2°C for the first and second crystallisation, respectively, such product was obtained with an over 60% yield as the middle fraction out of three that were isolated. The degree of hydrogenation of the fractionated fat did not affect the physical properties of the cocoa butter replacer, although it affected the yield. The physical properties of the fractions after the crystallisation of hydrogenated fat resulted mostly from high differences in the content of saturated and trans-unsaturated fatty acids.
    Po przeprowadzeniu szeregu uwodornień oleju rzepakowego w obecności katalizatora niklowego modyfikowanego siarką (Rys. 2a) stwierdzono, że zastosowane parametry procesu nie miały istotnego wpływu na własności fizyczne tłuszczu o tym samym stopniu uwodornienia (Rys. 3). Tłuszcz uwodorniony poddano frakcjonowanej krystalizacji z acetonu (Rys. 1). Stwierdzono, że optymalnymi warunkami frakcjonowania są temperatura 22°C przy pierwszej krystalizacji i 2°C przy drugiej krystalizacji. Stosując te parametry otrzymano z uwodornionego oleju rzepakowego tłuszcz mogący znaleźć zastosowanie jako zamiennik masła kakaowego (Rys. 4a). Produkt ten, stanowiący środkową spośród trzech wydzielonych frakcji, otrzymano z wydajnością ponad 60% (Tab. 1). Z oleju rzepakowego o różnym stopniu uwodornienia otrzymano namiastki masła kakaowego o takich samych własnościach fizycznych (Rys. 6). Stwierdzono duży wpływ stopnia uwodornienia tłuszczu poddanego krystalizacji na wydajność frakcji właściwej (Tab. 2). Znaczne różnice we własnościach fizycznych otrzymanych frakcji spowodowane są głównie bardzo dużymi różnicami w zawartości kwasów nasyconych, jak również kwasów nienasyconych w konfiguracji trans (Tab. 2).
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 1996, 05, 3; 37-48
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Steam Reforming Catalyst Geometry on the Performance of Tubular Reformer – Simulation Calculations
    Autorzy:
    Franczyk, E.
    Gołębiowski, A.
    Borowiecki, T.
    Kowalik, P.
    Wróbel, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/184862.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tubular steam reforming
    nickel catalyst geometry
    process simulation
    catalyst coking
    process intensification
    symulacja procesu
    katalizator koksujący
    intensyfikacja
    Opis:
    A proper selection of steam reforming catalyst geometry has a direct effect on the efficiency and economy of hydrogen production from natural gas and is a very important technological and engineering issue in terms of process optimisation. This paper determines the influence of widely used seven-hole grain diameter (ranging from 11 to 21 mm), h/d (height/diameter) ratio of catalyst grain and Sh/St (hole surface/total cylinder surface in cross-section) ratio (ranging from 0.13 to 0.37) on the gas load of catalyst bed, gas flow resistance, maximum wall temperature and the risk of catalyst coking. Calculations were based on the one-dimensional pseudo-homogeneous model of a steam reforming tubular reactor, with catalyst parameters derived from our investigations. The process analysis shows that it is advantageous, along the whole reformer tube length, to apply catalyst forms of h/d = 1 ratio, relatively large dimensions, possibly high bed porosity and Sh/St ≈ 0.30-0.37 ratio. It enables a considerable process intensification and the processing of more natural gas at the same flow resistance, despite lower bed activity, without catalyst coking risk. Alternatively, plant pressure drop can be reduced maintaining the same gas load, which translates directly into diminishing the operating costs as a result of lowering power consumption for gas compression.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 239-250
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of methane dry reforming over Ni/CaO–Al2O3 catalyst
    Autorzy:
    Cherbański, Robert
    Lewak, Michał
    Machniewski, Piotr
    Molga, Eugeniusz
    Franczyk, Ewelina
    Powiązania:
    https://bibliotekanauki.pl/articles/2086791.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dry methane reforming
    dimethyl ether
    nickel catalyst
    kinetics
    modelling
    eter dimetylowy
    katalizator niklowy
    kinetyka
    modelowanie
    Opis:
    This paper presents the results of investigations into dry methane reforming (DMR). The process was aimed at obtaining synthesis gas required for the production of dimethyl ether (DME). The effect of temperature, pressure and inlet gas composition on the process was determined in the experimental part of this work. The tests were carried out in a laboratory tubular reactor over a Ni/CaO–Al2O3 catalyst. The obtained experimental results were used to verify literature kinetic data and to develop a mathematical model of the DMR process.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 3; 235--252
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic activity of Pd-Ni in the oxidation of hydrogen for the safety of Catalytic activity of Pd-Ni in the oxidation of hydrogen for the safety of nuclear power plan
    Autorzy:
    Łomot, D.
    Karpiński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/779451.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    palladium
    palladium-nickel
    catalyst
    hydrogen oxidation
    Opis:
    Pd-Ni/Al2O3 systems were investigated in the reaction of hydrogen oxidation in terms of their possible application as catalysts used in passive autocatalytic recombiners (PARs) used in nuclear power plants. Testing experiments were carried out in a flowing system at different temperatures and humidity of the reaction mixture. The bimetallic catalysts exhibited higher response to the increase of temperature and higher resistance to inhibit water than the monometallic palladium catalyst. They showed excellent stability during a few tens of hours, similarly, like their monometallic counterpart. Our bimetallic catalysts of hydrogen oxidation can be used as cheaper alternatives to catalysts based on the precious metals in the hydrogen oxidation without loss of their activity over time.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 1; 15-18
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cerium-Promoted Nickel /Alumina Catalyst for Producer Gas Reforming and Tar Conversion
    Autorzy:
    Aljbour, Salah H.
    Kawamoto, Katsuya
    Powiązania:
    https://bibliotekanauki.pl/articles/2105271.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    cerium
    nickel
    tar
    naphthalene
    catalyst
    gasification
    reforming
    Opis:
    The catalytic conversion of a model tar compound, namely: naphthalene contained in a simulated producer gas from wood gasification process was investigated. The sol-gel approach was used to create a mesoporous Cepromoted Ni/alumina catalyst with high surface area. A surface area of 333 m2g was achieved by calcination of the mesoporous catalyst (17 wt% Ni and 2.8 wt% Ce) under air conditions at 1123 K. The catalysts were characterized using the N2 adsorption-desorption, XRD, and SEM techniques, and their promotion effect on producer gas reforming and tar removal was studied under dry, steam, and partial oxidation conditions. The Ni-based catalysts effectively converted naphthalene and increased the proportion of H2 and CO in the reformed gas. Incorporating Ce into the catalyst increased the proportion of H2 and CO in the reformed gas, while lowering the amount of CH4 and CO2. In the absence of oxygen, catalytic reforming of the producer gas resulted in 79.6% naphthalene conversion, whereas catalytic partial oxidation conditions resulted in 99.1% naphthalene conversion.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 6; 58--66
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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