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    Wyświetlanie 1-3 z 3
    Tytuł:
    Zastosowanie spektroskopii w podczerwieni w adsorpcji i katalizie (II)
    Application of infrared spectroscopy in adsorption and catalysis (II)
    Autorzy:
    Sarbak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/171816.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    spektroskopia IR
    tlenek węgla
    chemisorpcja
    powierzchnia katalizatorów
    depozyt węglowy
    katalizatory
    FTIR
    carbon monoxide
    chemisorption
    catalyst surface
    coke deposition
    catalysts
    Opis:
    The review presents important results on infrared examination of adsorbents and catalysts, which were obtained in Laboratory of Adsorption and Catalysis in Environmental Protection at Adam Mickiewicz University – conducted under the author guidance. In the first chapter results on chemisorption of carbon monoxide on Pt and Pt–Sn catalysts supported on various carriers such as alumina with different specific surface area and silica were described. For these catalysts different amount of Pt or Pt and Sn were used. Besides, catalysts obtained by different preparation procedures were also investigated. Second chapter contains description of coke deposit on alumina and silica supports as well as on Pt and Pt–Sn catalysts supported on above mentioned carriers. Special attention was also devoted to coke deposition on aluminosilicate, zeolite type A, X and ZSM-5 and Pt–Cr, Pt-Mo and Pt-W catalysts supported on alumina. Moreover, coke deposition on alumina contained chloride ions and molybdena- (VI) ions on alumina activated by reduction and sulfidation were also investigated. It seems that above presented results based on infrared examination will help to better understand of adsorbents and catalysts structure and their action during adsorption and catalytic reactions.
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 5-6; 395-426
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Salt and precipitating agent effect on the specific surface area and compressive strength of alumina catalyst support
    Autorzy:
    Mahmoudian, M.
    Hemmati, A.
    Hashemabadi, H.
    Ghaemi, A.
    Shahhosseini, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778022.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Alumina
    Catalyst Support
    Sol Gel
    Specific Surface Area
    compressive strength
    Opis:
    Nowadays, catalyst supports are extensively used to decrease the costs and increase the contact surface area in chemical reactions. Specific surface area, compressive strength, pore volume and pore size are some of the most important characteristics of a catalyst support. In this work, Sol-gel and peptization methods were applied to produce alumina catalyst support. Also the roles of aluminum salts and precipitating agents on the specific surface area and compressive strength of alumina catalyst support were investigated. In addition, various additives and common methods in the increasing surface area, compressive strength and adjusting the porosity and pore size are used in this study. The results show that using caustic soda as precipitating agent and aluminum chloride salt yields catalyst supports with the best compressive strength. Also, using aluminum nitrate and ammonia as precipitating agent produced alumina catalyst support with the highest specific surface area.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 35-40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of vanadium and tungsten from spent selective catalytic reduction catalyst by alkaline pressure leaching
    Autorzy:
    Liu, Nana
    Xu, Xinyang
    Liu, Yuan
    Powiązania:
    https://bibliotekanauki.pl/articles/110694.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spent SCR catalyst
    alkaline pressure leaching
    response surface method
    Box-Behnken design
    Opis:
    Improving the efficiency of precious metal recovery from spent Selective Catalytic Reduction (SCR) catalyst provides economic benefits and promises sustainable use of resources. Here we demonstrate highly efficient alkaline pressure leaching method for the extraction of vanadium (V) and tungsten (W) from spent SCR catalyst. We analyzed the effects of experimental parameters such as the stirring speed, leaching agent concentration, leaching temperature, liquid-to-solid ratio, and leaching time. The Box-Behnken design of experiments and the response surface methodology have been employed to understand the impact of the leaching parameters and the impact of their interactions on the leaching rate of V and W. The results showed that the leaching agent concentration significantly promoted the recovery of V and W; the influence of the reaction temperature and leaching time moderately increased the leaching rate of the metals. Moreover, the efficiency of the alkaline pressure leaching technique was determined by the interactions between leaching time and reaction temperature, and the relationships between reaction temperature and leaching agent concentration. By using the response surface methodology, the optimal leaching conditions were found that the leaching agent concentration was 4.75 molL-1, the leaching temperature was 190 °C, and the reaction time was 44.5 min, and the predicted values of V and W leaching rates were 95.76% and 98.36%, respectively. Based on the excellent fitting between modeling and experimental results demonstrated in this work, we conclude that our study can shed light on the development of highly efficient and sustainable metal recovery strategies for practical applications.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 3; 407-420
    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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