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    Wyświetlanie 1-4 z 4
    Tytuł:
    Kataliza heterogeniczna
    Autorzy:
    Rachwalik, R.
    Ogonowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/273835.pdf
    Data publikacji:
    2010
    Wydawca:
    Roble
    Tematy:
    kataliza heterogeniczna
    katalizatory heterogeniczne
    jonon
    heterogeneous catalysis
    heterogeneous catalysts
    ionium
    Źródło:
    LAB Laboratoria, Aparatura, Badania; 2010, 15, 2; 19-26
    1427-5619
    Pojawia się w:
    LAB Laboratoria, Aparatura, Badania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kataliza procesów hydrosililowania z udziałem cieczy jonowych
    Catalysis of hydrosilylation processes with the participation of ionic liquids
    Autorzy:
    Bartlewicz, Olga
    Szymańska, Anna
    Jankowska-Wajda, Magdalena
    Dąbek, Izabela
    Maciejewski, Hieronim
    Powiązania:
    https://bibliotekanauki.pl/articles/1413312.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hydrosililowanie
    kompleksy Rh
    kompleksy Pt
    ciecze jonowe
    SILPC
    kataliza heterogeniczna
    hydrosilylation
    Rh complexes
    Pt complexes
    ionic liquids
    heterogeneous catalysis
    Opis:
    Hydrosilylation is a fundamental and elegant method for the laboratory and industrial synthesis of organosilicon compounds. The hydrosilylation reaction is usually performed in a single-phase homogeneous system. A major problem, particularly in homogeneous catalysis, is the separation of catalyst from the reaction mixture. The presence of metals in the reaction products, even in trace quantities, is unacceptable for many applications, therefore efforts have been made at applying heterogeneous catalysts or immobilised metal complexes in order to obtain high catalytic activity and easy product isolation at the same time. One of the methods for producing such catalysts is the employment of ionic liquids as agents for the immobilization of metal complexes. Biphasic catalysis in a liquid-liquid system is an ideal approach through which to combine the advantages of both homogeneous and heterogeneous catalysis. The ionic liquids (ILs) generally form the phase in which the catalyst is dissolved and immobilized. In our research we have obtained a number of catalytic systems of such a type which were based on rhodium and platinum complexes dissolved in phosphonium, imidazolium, pyridinium and ammonium liquids. Currently, there has a common trend to obtain heterogenized systems that combine advantages of homogeneous and heterogeneous catalysis, which makes the hydrosilylation process more cost- effective. Such integration of homo- and heterogeneous catalysts is realized in several variants, as supported IL phase catalysts (SILPC) and solid catalysts with ILs layer (SCILL). Although all the above systems show high catalytic activities, their structure is unknown. This is why we have made attempts to modify selected ionic liquids (corresponding to our most effective systems) and we have applied them as ligands in the synthesis of platinum and rhodium complexes. Another group of catalysts comprises anionic complexes of rhodium and platinum which were obtained by reactions between halide complexes of metals and a respective ionic liquid. Most of the obtained complexes are solids insoluble in hydrosilylation reagents and are characterized by a high catalytic activity. A considerable development of heterogeneous catalysts of this type and their application in many hydrosilylation processes can be expected in the future. This mini-review briefly describes the recent progress in the design and development of catalysts based on the presence of ionic liquids and their applications for hydrosilylation processes.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 1-2; 5-29
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalyst regeneration techniques in naphtha reforming: Short review
    Autorzy:
    Gupta, Aviral
    Gupta, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173419.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heterogeneous catalysis
    regeneration
    naphtha reforming
    catalyst reactivation
    non-linear
    modelling
    kataliza heterogeniczna
    regeneracja
    reformowanie benzyny ciężkiej
    reaktywacja katalizatora
    modelowanie
    Opis:
    Catalytic reforming is an important intermediate in the processing of crude (naphtha in particular) to obtain gasoline. The catalyst used in the process (platinum) is quite expensive and may negatively impact the business if not used judiciously. The aforesaid not only refers to the reduction in loss of the catalyst per unit of gasoline produced but also to the manufacturing of an environmentally friendlier product alongside which is the need of the planet and also a necessity to meet the increasingly strict government norms. In order to meet the above requirements, various refineries around the world use various well-known conventional methods which depend on the quality and quantity of crude manufactured by them. This paper focuses on highlighting recent advancements in methods of catalytic regeneration (CR) in the reforming unit of petroleum industries to produce high octane gasoline, without any major replacements in their existing setup. Research papers formulated by the application of methodologies involving non-linear models and real-time refinery data have only been considered to avoid any deviations/errors in practical applications. In-depth analysis of these papers has led to the origin of some ideas which have been included as suggestions and can be considered as subjects of further research. In all, the objective of the paper is to serve as a reference for researchers and engineers working on devising optimum methods to improve the regeneration of reforming catalysts.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 2; 101--108
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional materials based on carbon : encapsulated iron nanoparticles
    Materiały funkcjonalne oparte na magnetycznych nanokapsułkach węglowych
    Autorzy:
    Kasprzak, Artur
    Popławska, Magdalena
    Koszytkowska-Stawińska, Mariola
    Powiązania:
    https://bibliotekanauki.pl/articles/2057908.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    nanomateriały węglowe
    magnetyczne nanokapsułki węglowe
    nanomedycyna
    elektrochemia
    kataliza heterogeniczna
    adsorpcja
    carbon nanomaterials
    carbon-encapsulated iron nanoparticles
    nanomedicine
    electrochemistry
    heterogeneous catalysis
    adsorption
    Opis:
    The chemistry of carbon nanomaterials attracts continuous attention of scientists because of their promising properties and applications. Carbon-encapsulated iron nanoparticles (CEINs) are subgroup of carbon nanomaterials. CEINs are the core-shell nanostructures including the metallic phase permanently encapsulated in a tight carbon coating. The carbon shell protects CEINs against oxidation of metal into a corresponding oxide, as well as prevents them from spontaneous aggregation. It has been documented that the magnetic properties of CEINs are superior in comparison with the respective materials comprising metal oxides. Additionally, the presence of the carbon shell enables surface functionalization of CEINs by means of various synthetic routes, both covalent and non-covalent ones. Chemical functionalization enables tuning the materials’ properties and applications, for example toward introducing catalytically active sites or improving colloidal stability. One may conclude that CEINs combine physicochemical properties of graphene and iron nanoparticle. Therefore, this is prospective material for many applications. In this article, we discuss the properties, chemistry and selected applications of CEINs.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 11-12; 1211--1233
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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