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    Wyświetlanie 1-3 z 3
    Tytuł:
    Selective catalytic reduction of NO,sub>x with ammonia (NH3-SCR) over transition metal-based catalysts -influence of the catalysts support
    Autorzy:
    Szymaszek, Agnieszka
    Samojeden, Bogdan
    Motak, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/109757.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    NH3-SCR
    NOx
    clinoptilolite
    layered clays
    iron
    Opis:
    Natural layered clays (bentonite and vermiculite) and natural zeolite (clinoptilolite) were tested and compared as the supports of the catalysts forselective catalytic reduction withammonia (NH3-SCR). The raw materials were modified in order to improve their catalytic properties. Layered clays were treated with HNO3 and intercalated with Al2O3 pillars to enhance their acidity, porosity and specific surface area. Clinoptilolite was ion-exchanged with NH4NO3 in order to increase the content of Brönsted acid sites, indispensablefor NH3 adsorptionduring the reaction. Subsequently, iron as an active phase was deposited on the modified supports by various methods, including incipient wetness impregnation, ion-exchange and co-precipitation. The efficiency of these methods was compared as NOx conversionobtained for each material. XRD analysis indicated that the initial modifications affected the structure of the raw aluminosilicates. FT-IR measurement confirmed the presence of characteristic Si-O and Al-O bonds and H2O molecules that occurnaturally in the materials. UV-Vis spectroscopy results indicated that different types of Fe species were deposited on the catalysts surface and theirform strongly depends on the type of the support. NH3-SCR catalytic tests showedthat all of the analyzed materials exhibitsatisfactory level of NO conversion and negligible concentration of by-product (N2O) in the exhaust gas. The highest catalytic activity (ca. 50% at 170°C and over 95% above 250°C) was obtained for Fe-Bent. The lowest concentration of N2O in the flue gas (less than 5 ppm in the whole temperature range) was observed for Fe-Clin.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1429-1441
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified bentonite-derived materials as catalystsfor selective catalytic reduction of nitrogen oxides
    Autorzy:
    Szymaszek, Agnieszka
    Kubeł, Maciej
    Samojeden, Bogdan
    Motak, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/185436.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pillared bentonite
    acid activation
    alumina
    iron
    copper
    selective catalytic reduction
    NO
    DeNO
    aktywacja kwasem
    glinka
    żelazo
    miedź
    Selektywna redukcja katalityczna
    Opis:
    In the last few years, cationic layered clays, including bentonites have been investigated as potentialcatalysts for SCR DeNOxsystems. In this work, bentonite as the representative of layered clays wasmodified in order to obtain an alternative, low-cost NH3–SCR catalyst. Samples of raw clay wereactivated with HCl or HNO3, treated with C2H2O4and subsequently pillared with alumina by the ion-exchange. Afterwards, the modified materials were impregnated with iron and copper. The obtainedcatalysts were characterized by XRD and FT-IR. SCR catalytic tests carried out over analyzed samplesindicated the conversion of NO of approximately 90% for the most active sample. The type of acidused for modification and the type of active phase strongly influenced the catalytic properties of theanalyzed materials.
    Źródło:
    Chemical and Process Engineering; 2020, 41, 1; 13--24
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical properties and NH3-SCR catalytic performance of intercalated layered aluminosilicates
    Autorzy:
    Szymaszek-Wawryca, Agnieszka
    Díaz, Urbano
    Samojeden, Bogdan
    Motak, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/24085707.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bentonite
    DeNOx
    pillaring
    iron
    copper
    Opis:
    The representative of natural layered clays, bentonite, was modified according to two routes and tested as a new catalyst for selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR). The natural acid-activated clay was ion-exchanged with Na+ or remained in H-form and pillared with metal oxides. In order to limit the number of synthesis steps, iron as an active phase was introduced simultaneously with Al2O3 during the intercalation procedure. Additionally, the samples were doped with 0.5 wt% of copper to promote low-temperature activity. It was found that the performed modifications resulted in disorganization of the ordered layered arrangement of bentonite. Nevertheless, acid activation and pillaring improved structural and textural parameters. The results of catalytic tests indicated that the samples containing Fe2O3 pillars promoted with Cu exhibited the highest NO conversion of 85% at 250°C (H-Bent-AlFe-Cu) and 75% at 300°C (Na-Bent-AlFe-Cu). What is important, activity of the protonated samples in the high-temperature region was noticeably affected by the side reaction of ammonia oxidation, correlated with the production of NO and resulting in N2O emission during the process comparing to Na-Bentonite catalysts.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 171381
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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