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    Wyświetlanie 1-3 z 3
    Tytuł:
    Activity of monolithic Pd/Al2O3 catalysts in the combustion of mine ventilation air methane
    Autorzy:
    Kucharczyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/779819.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    katalityczne utlenianie metanu
    katalizatory monolityczne
    powietrze wentylacyjne kopalni
    catalytic oxidation of methane
    monolithic catalysts
    mine ventilation air
    Opis:
    The activity of Pd/Al2O3 catalysts increases when Pd content is increased from 1% to 2%. Among these catalysts, 2%Pd/Al2O3 shows the highest methane combustion activity. In a reduced form, the catalyst displays a higher activity than in the oxidized form. 24-hour ageing at 600oC to 800oC lowers the catalytic activity of 2%Pd/Al2O3 due to Pd crystallite sintering. After 110-hour oxidation of 1% methane in air over 2%Pd/Al2O3, conversion decreases from 100% to 88%. Upon reduction with hydrogen (performed after 24-hour ageing at 700oC and 110-hour methane oxidation), the 2%Pd/Al2O3 catalyst regains its initial activity. The high activity of Pd catalysts renders them suitable for methane removal from coal mine ventilation air at high gas fl ow velocities and temperatures lower than 600oC.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 57-62
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic oxidation of organic pollutants
    Autorzy:
    Parus, W.J.
    Paterkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778865.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    katalityczne utlenianie metanolu
    katalityczne utlenianie octanu n-butylu
    katalizatory V2O5/TiO2 i MoO3/TiO2
    makrokinetyka procesu utleniania
    catalytic oxidation of methanol and n-butyl acetate
    V2O5/TiO2 and MoO3/TiO2 catalysts
    macrokinetics of oxidation process
    Opis:
    The paper presents the results of the measurements of the catalytic activity of V2O5/TiO2 and MoO3/TiO2 catalysts (8,10,12 and 15 wt % of V2O5 or MoO3 on TiO2 - anatase, respectively), prepared in our laboratory, in the complete oxidation (combustion) process of chosen volatile organic pollutants of the air such as methanol and n-butyl acetate. The activity of these catalysts was compared with the activity of industrial catalysts: supported platinum - Pt-p (0.15 wt % of Pt on γ-Al2O3) and MCA (15 wt % of CuO and 6 wt % of ZnO on γ-Al2O3). The investigations were carried out in the kinetic region (powder of the catalysts with the diameter in the range of 1.02-1.2ź10-4 m) and for the chosen catalysts also in the diffusion region (the grains of the catalysts having the diameter of 2.5ź10-3 m). On the basis of the obtained results the analysis of the process was performed. It has been stated that reaction rate is well-described by the first order equation in relation to the methanol or n-butyl acetate concentration. On the basis of the obtained results in the kinetic region for all the applied catalysts the parameters of Arrhenius equation were determinated. The comparison of the results for the kinetic region with the results for the diffusion region for the chosen catalysts allowed the calculation of the effective coefficients of diffusion. The parameters of Arrhenius equations as well as the effective coefficients of diffusion show a good correlation with the values obtained for the catalytic combustion of other organic pollutants of the air. The measurements were carried out using a flow tubular reactor. The flow rate of the reaction mixture was kept constant 20 dm3/h (5.56ź10-6 m3/s) in each test, using the space velocity of 20 s-1. It has been stated that the use of the applied catalysts led to the almost total oxidative destruction of both pollutants. Only H2O and CO2 were found as the final products of the reaction. The complete oxidation of the methanol process runs at the lower temperature than that of the complete oxidation process of n-butyl acetate. The most active at the combustion of methanol was the Pt-p catalyst. It demonstrates a comparable activity to molybdenum - titanium catalysts and the slightly lower activity than vanadium - titanium catalysts in the combustion of the n- butyl acetate process. The MCA catalyst was less active than the others in the oxidation of both compounds. The structures of the catalysts were tested using the X -ray analysis (XRD), infrared spectroscopy and scanning microscopy (SEM). The results of the investigations show that V2O5/TiO2 and MoO3/TiO2 catalysts, especially the most active of them the 8% V2O5/TiO2 catalyst can be used in industrial systems for the purification of the air and industrial waste gases with VOCs, replacing the more expensive noble metals supported catalysts.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 4; 30-37
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalysts for the utilization of methane from the coal mine ventilation air
    Autorzy:
    Stasińska, B.
    Machocki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/777952.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    powietrze wentylacyjne
    kopalnia węgla
    metan
    utylizacja metanu
    katalityczne utlenianie metanu
    katalizator tlenkowy
    katalizator palladowy
    coal mine ventilation air
    utilization of methane
    catalytic oxidation of methane
    oxide catalysts
    palladium catalysts
    Opis:
    The paper indicates coal mines as the source of permanent emission of low-concentrated gases, which have increased the greenhouse effect. This paper proposes the catalytic oxidation of methane as the solution to the problem of methane utilization when its concentration in the air is insufficient for flame combustion. The studies which have been conducted for many years enabled finding the active oxide and metallic catalytic systems for the reaction of methane oxidation. For the utilization of gases with low-concentrated methane, using the low-temperature catalysts, especially palladium catalysts, seems to he economically well-justified. Depending on technological solutions it can be considered as the method for methane utilization or as an environmentally friendly way for the generation of electric and thermal energy.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 29-32
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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