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    Wyświetlanie 1-7 z 7
    Tytuł:
    Catalytic reduction of nitrous oxide at a nitric acid plant in Bulgaria
    Autorzy:
    Stefanova, M.
    Chuturkova, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/207530.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    catalysts
    chemical plants
    emission control
    nitric acid
    nitrogen oxides
    catalytic decomposition
    catalytic reduction
    nitrous oxide
    industrial emissions
    katalizatory
    zakłady chemiczne
    kontrola emisji
    kwas azotowy
    tlenki azotu
    rozkład katalityczny
    redukcja katalityczna
    podtlenek azotu
    emisje przemysłowe
    Opis:
    A nitric acid plant in Devnya, Bulgaria has implemented a project for catalytic decomposition of nitrous oxide which resulted in reducing N2O emissions from the plant and the overall N2O emissions from the industrial sector in Bulgaria. After implementing the catalyst in September 2005 till the end of 2011, a total amount of 3133 Mg N2O emissions has been measured while the supposed value of N2O emissions without the catalyst being installed would have been 9747 Mg which means a total reduction of 6614 Mg. The results from the research prove the emission reduction potential of the catalyst.
    Źródło:
    Environment Protection Engineering; 2014, 40, 3; 87-97
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reakcje i procesy katalityczne. Cz. V. Synteza tritlenku siarki
    Autorzy:
    Sarbak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/274150.pdf
    Data publikacji:
    2010
    Wydawca:
    Roble
    Tematy:
    reakcja katalityczna
    procesy katalityczne
    trójtlenek siarki
    synteza
    catalysts reduction
    catalytic processes
    sulfur trioxide
    synthesis
    Źródło:
    LAB Laboratoria, Aparatura, Badania; 2010, 15, 6; 34-40
    1427-5619
    Pojawia się w:
    LAB Laboratoria, Aparatura, Badania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combination of LNT and SCR for NOx reduction in passenger car applications
    Autorzy:
    Maunula, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/134216.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    NOx
    Selective Catalytic Reduction
    SCR
    LNT
    catalysts
    diesel
    selektywna redukcja katalityczna
    katalizator
    Opis:
    The removal of NOx and particulate emissions in light-duty diesel vehicles will require the use of aftertreatment methods like Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) with urea and Lean NOx Trap (LNT) (Euro 6 and beyond). A new concept is the combination of LNT + SCR, which enables on-board synthesis of ammonia (NH3), which reacts with NOx on the SCR catalyst. The main application for this kind system will be lighter passenger cars, where LNTs may be used instead of full urea-SCR system. That particular combinatory system was investigated by developing platinum (Pt) and rhodium (Rh) containing LNTs and SCR catalysts in this study. In the use conditions, the maximum temperature may reach temperatures up to 800°C and NOx reduction reactions should proceed without NO2 assistance in the SCR position after LNT and DPF. PtRh/LNT with the total loadings of 85 g/cft (2.8 g/L) and higher resulted in a high NOx efficiency above 80–90% with a broad operation window in the laboratory simulations. In the experimental conditions, a higher NH3 concentration after LNT was essential to simulate well the operation of SCR catalysts. The developed Cu-SCR catalyst showed a high hydrothermal durability up to the ageing temperature of 800°C and a wide operation window without the NO2 assistance (NO only in feed). Fe-SCR and V-SCR catalysts were more dependent on NO2. A studied concept had an air injection after LNT to keep SCR condition always in lean side, where the SCR reaction was promoted by oxygen resulting in high reduction selectivity to nitrogen (N2) without NH3 emissions. The simulations in reaction conditions and system design resulted in the proposals for the optimal design and main reaction mechanism in DOC + DPF + LNT + SCR systems.
    Źródło:
    Combustion Engines; 2014, 53, 2; 60-67
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Pt/Al2O3 catalysts produced by sol-gel process to uranyl ion reduction
    Autorzy:
    Deptuła, A.
    Łada, W.
    Olczak, T.
    Chmielewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146103.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    sol-gel
    Pt/Al2O3 catalysts
    uranyl ion reduction
    Opis:
    Various kinds of active alumina supports were obtained by the Institute of Nuclear Chemistry and Technology (INCT) sol-gel process in the following steps: (1) preparation of alumina sols by extraction of nitrates with Primene JMT from aluminium nitrate solution; (2) gelation to spherical particles (with diameter < 100 žm) by extraction of water from sol emulsion in 2-ethyl-1-hexanol; (3) sometimes conversion of NO3 - stabilized gel to OH- form by reaction with ammonia; (4) calcination of gels to ?-Al2O3 with specific surface area > 100 m2/g at 500°C. The powders were then impregnated with chloroplatinic acid and recalcined at 500°C. Catalysts were also prepared by direct gelation of alumina sol containing hydroplatinic acid followed by steps (3) and (4). Pt/Al2O3 catalysts were used for the reduction of 1M UO2(NO3)2 - 0.5M HCOOH solution with hydrogen at atmospheric pressure. The course of the reduction was controlled analytically and by measuring the U(VI)/U(IV) redox potential. It was concluded that the catalysts obtained by impregnation of the supports prepared from nitrate stabilized gels exhibit the best activity and stability.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 79-82
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalityc removal of nitrogen oxide from combustion gases
    Autorzy:
    Ćwikła-Bundyra, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778593.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    redukcja katalityczna
    usuwanie tlenków azotu
    katalizatory metaliczne
    catalytic reduction of NO by methane
    platinum group metals catalysts
    Opis:
    Nitrogen oxide conversion to nitrogen over Pt/Al2O3, Pd/Al2O3, Rh/Al2O3 catalysts was investigated. The results of the catalytic activity investigations, with the iso-x method, showed that NO reduction by methane occurs at a reasonable rate at the temperature range 200-500°C. Alumina-supported Pd, Pt and Rh catalysts have been compared for the selective reduction of NO to N2. All the catalysts showed good activity in NO reduction by methane, giving around 80 - 90% N2 production. At moderate temperatures Pt is the most active catalyst for the removal of NO.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 4; 56-58
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the exchanged metal ions (Cu, Co, Ni and Mn) on the selective catalytic reduction of NO with hydrocarbons over modified ferrierite
    Autorzy:
    Ćwikła-Bundyra, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778840.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    catalytic reduction
    nitrogen oxides
    ferrierite
    selective catalysts
    ion exchanged
    Opis:
    This article presents the research results concerning the possibilities of natural zeolite-ferrierite application for the reduction of nitrogen oxide. H-FER forms were modified by Cu+2, Co+2, Mn+2, Ni+2 using an ion exchange procedure. The effect of metal contents was shown for the ferrierite matrices and related to their catalytic properties. The catalytic properties of Cu-, Co-Ni-, and Mn- were compared for NO reduction with methane. High NO conversion was observed for copper and cobalt-ferrierite catalysts, especially in the temperature range 400 and 500oC. It was found that copper- and cobalt-ferrierite catalysts have higher activity and N2 selectivity than the catalysts composed of nickel and manganese doped on ferrierite. Moreover, the nickel and manganese containing catalysts produced more nitrous oxide than nitrogen. The presence of both copper and cobalt species seems to be an indispensable condition for a large activity and selectivity in the NO reduction.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 2; 10-15
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of NO with methane over metal ion-exchanged mordenite
    Autorzy:
    Ćwikła-Bundyra, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/346983.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    selective catalytic reduction of NO
    mordenite
    catalysts
    Co(II)
    Ni(II)
    Cu(II)
    Opis:
    This article presents the results of research studies on the possibilities of application of natural zeolite-mordenite for the reduction of nitrogen oxide. Various kinds of metal ions were added to the zeolite samples using the ion-exchange method. The effect of metal contents was shown for the mordenite and related to their catalytic properties. The catalytic properties of Cu-, Co-, Ni- were compared for NO reduction with methane. High nitric oxide conversions were observed for copper and cobalt-mordenite, especially in the temperature range between 400 and 500 C degree. Copper- and cobaltmordenite catalysts showed higher activities and selectivities than catalysts composed of nickel-exchanged mordenite.
    Źródło:
    Ars Separatoria Acta; 2011, 8; 109-119
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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