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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of Manganese and Manganese-Copper Catalysts Synthesis on Decomposition of Hydrogen Peroxide and Phenol Oxidation
    Wpływ metod syntezy katalizatorów manganowych i manganowo--miedziowych na rozkład nadtlenku wodoru i utlenianie fenolu
    Autorzy:
    Sarbak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/388319.pdf
    Data publikacji:
    2009
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    katalizatory Mn i Mn-Cu
    rozkład nadtlenku wodoru
    utlenianie fenolu
    catalyst synthesis
    hydrogen peroxide decomposition
    phenol oxidation
    Opis:
    Characterization of performance of manganese and manganese-copper oxide catalysts obtained by different methods of synthesis is presented. The specific surface area and catalytic activity were determined in decomposition of hydrogen peroxide and phenol oxidation. The catalytic performance of the catalysts studied was different in the two reactions.
    Przedstawiono wyniki badań nad wykorzystaniem tlenkowych preparatów manganowych i manganowo-miedziowych otrzymanych różnymi metodami syntezy. Dla otrzymanych preparatów wyznaczono wielkość powierzchni właściwej oraz określono aktywność katalityczną w rozkładzie nadtlenku wodoru i utlenianiu fenolu. Wykazano zróżnicowaną aktywność katalityczną preparatów w obu wymienionych reakcjach.
    Źródło:
    Ecological Chemistry and Engineering. A; 2009, 16, 11; 1451-1458
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phenol oxidation with hydrogen peroxide using Cu/ZSM5 and Cu/Y5 catalysts
    Autorzy:
    Valkaj, K. M.
    Wittine, O.
    Margeta, K.
    Granato, T.
    Katović, A.
    Zrnčević, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778896.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    oczyszczania ścieków
    utlenianie fenolu
    nadtlenek wodoru
    katalizator
    Cu/ZSM5
    Cu/Y5
    wastewater treatment
    phenol oxidation
    hydrogen peroxide
    catalysts
    Opis:
    In this work, catalytic activity and stability of Cu/Y5 and Cu/ZSM5 zeolites in phenol oxidation with hydrogen peroxide were examined. The catalyst samples were prepared by the ion exchange method of the protonic form of commercial zeolites. The catalysts were characterized by the powder X-ray diffraction (XRD), AAS, while the adsorption techniques were used to measure the specific surface area. The thermal programmed desorption of NH3 (NH3-TPD) was used for measuring the total number of acid sites formed on the surface of zeolites. Catalytic performance of the prepared samples was monitored in terms of phenol, hydrogen peroxide and total organic carbon (TOC) conversion, by-product distribution and a degree of copper leached into the aqueous solution. It was found that the activity of Cu/Y5 catalyst was generally higher than that of Cu/ZSM5 and that unlike Cu/ZSM5, Cu/Y5 catalyzed phenol oxidation more completely.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 3; 28-36
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing some advanced oxidation processes in the abatement of phenol aqueous solutions
    Autorzy:
    Jaramillo-Sierra, Bethsabet
    Mercado-Cabrera, Antonio
    Peña-Eguiluz, Rosendo
    Hernández-Arias, Alma Neli
    López-Callejas, Régulo
    Rodríguez-Méndez, Benjamín Gonzalo
    Valencia-Alvarado, Raúl
    Powiązania:
    https://bibliotekanauki.pl/articles/207453.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    AOP
    oxidation of phenol
    Advanced Oxidation Processes
    utlenianie fenolu
    zaawansowane metody utleniania
    Opis:
    In this work, phenol oxidation in aqueous solution promoted by the effect of the oxidizing agents H2O2, O3 and UV radiation and their synergy in four different advanced oxidation processes (O3, O3/UV, H2O2/O3 and O3/H2O2/UV) were assayed. Studies were performed with a closed-loop hydraulic circuit set up with a relatively high volume of solution (500 cm3) during 90 min of treatment time. Parameters such as concentration for oxidizing species, pH, presence of UV irradiation were evaluated. The resulting degradation efficiencies were evaluated using GC-MS. The agents here used were selected considering their ease of handling and low toxicity, generation of deposited matter or sludge, so a filtration treatment for the analysis of the samples was not required. In all cases, it was observed that with increasing treatment time better degradation efficiencies were obtained. The best results were obtained with the combination of O3/H2O2/UV where up to 95% degradation was attained at pH 9, which is due to active species generated in the process, e.g., O3 and OH˙, on the contaminant. SPE was performed for determining the presence of several by-products, mainly: catechol, resorcinol and hydroquinone, which were identified.
    Źródło:
    Environment Protection Engineering; 2019, 45, 3; 23-38
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    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:
    Katalityczne utlenianie fenolu w reaktorze trójfazowym ze stałym złożem pracujacym przy periodycznie zmiennym zraszaniu
    Catalytic wet air oxidation of phenol in a trickle bed reactor operating at periodic liquid flow modulation
    Autorzy:
    Szczotka, A.
    Bartelmus, G.
    Krótki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2071119.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    fenol
    katalityczne utlenianie
    periodyczny przepływ cieczy
    phenol
    catalytic oxidation
    periodic liquid flow
    Opis:
    W publikacji przedstawiono wyniki badań doświadczalnych procesu ultrafiltracji modelowych i przemysłowych solanek z zastosowaniem membran ceramicznych 150 kDa. Głównym celem badań była analiza wpływu dwóch podstawowych parametrów operacyjnych, stężenia chlorku sodu w nadawie i ciśnienia transmembranowego TMP m fouling badanej membrany ceramicznej Al2O3/TiO2/ZrO2.
    Results of ultrafiltration studies using ceramic 150 kDa membrane and model solutions containing bovine serum albumin and sodium chloride as well as salted wastewater from fish industry are reported. A main objective of this work was to study the effect of two main operating parameters, i.e. sodium chloride concentration in feed solution and transmembrane pressure, TMP, on fouling behavior of ceramic Al2O3/TiO2ZrO2. membrane during ultrafiltration tests.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2010, 3; 111-112
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie sorpcji i zaawansowanego utleniania do usuwania fenoli i ich pochodnych z roztworów wodnych
    Application of Sorption and Advanced Oxidation Processes for Removal of Phenols from Aqueous Solutions
    Autorzy:
    Dąbek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818555.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    fenol
    chlorofenol
    węgiel aktywny
    utlenianie
    rodnik hydroksylowy
    phenol
    chlorophenol
    activated carbon
    oxidation
    hydroxyl radicals
    Opis:
    The removal of organic contaminants such as aliphatic and aromatic hydrocarbons, phenols and related compounds, halogenated compounds, polycyclic aromatic hydrocarbons, aldehydes, ketones, acids, detergents, fats, dyes etc. from water and sewage is still an interesting and significant problem in environmental engineering. Both household and industrial waste is a source of organic contaminants in the environment. Higher and higher requirements regarding treated waste that is directed to water or the ground require constant development of the waste treatment process. The literature data and implemented solutions indicate that more and more attention is now paid to the use of sorption and advanced oxidation processes for the removal of organic compounds. The highest significance and application among available sorbents has activated carbon. The sorption properties of activated carbon are dependent on its porous structure, produced by the system of interconnected macro-, meso- and micropores as well as the chemical composition of the surface resulting from the presence of oxygen functional groups. Activated carbon is especially useful as sorbents of phenol and chlorophenol. It has been shown that the adsorption ability of activated carbon depends on the specific surface area, porosity and surface chemical composition. High affinity of phenol to the surface of activated carbon is related to the creation of donor-acceptor complexes between alkaline locations on the sorbent’s surface and the aromatic ring. Oxidation of activated carbon’s surface leading to increased acidity lowers the sorption capacity of activated carbon. While the presence of metals increases the sorption capacity of activated carbon in relation to phenol due to the donor-acceptor interaction of metal-electrons of π aromatic ring in the phenol particle. Another method of successful oxidation of phenols is their oxidation especially with the AOP methods (Advanced Oxidation Processe)s. A characteristic feature of these methods is oxidation of generally all organic compounds to CO2, H2O and inorganic compounds with the use of the hydroxyl radical OH* (generated in the solution) of extremely high oxidising potential of 2,8 V. Phenols and the related compounds quite easily undergo oxidation, especially with Fenton and photo-Fenton reactions. Both sorption and oxidation of organic compounds (including phenols) with AOP methods have advantages (high output and efficiency) and disadvantages (treatment of used sorbents, significant use of oxidants and increased sewage volume). In order to focus on the advantages of sorption and advanced oxidation while limiting their disadvantageous effect a combination of these two processes is considered. In this case the removal of contaminants is arranged as a two- or one-stage process. In the first one the removal of organic compounds covers sorption and then oxidation of the adsorbed substances with the use of AOP, which leads to a simultaneous regeneration of activated carbon. While in the latter case simultaneous sorption and oxidation of organic compounds is considered. In these both cases activated carbon acts as a sorbent of organic compounds and catalyst in the production of hydroxyl radicals OH* which are responsible for oxidation of organic compounds both in the solution and adsorbed on the activated carbon. It has been proven that in the presence of activated carbon in the environment of hydrogen peroxide, oxidation occurs of such organic compounds that do not undergo oxidation with the same oxidant in the aqueous solution. The applicability of activated carbon for the simultaneous removal of organic compounds is dependent on both their sorption and catalytic properties. Activated carbon should be alkaline, have high specific volume, pores’ volume, iodine number and significant dechlorination ability.The applicability of oxidation of organic compounds with the use of hydroxyl radicals created on the surface of activated carbon for regeneration of the used sorbents has also been proven.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 616-645
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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