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Wyświetlanie 1-15 z 20
Tytuł:
Examination of steam gasification of coal with physically mixed catalysts
Autorzy:
Śpiewak, Katarzyna
Czerski, Grzegorz
Sopata, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/779131.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
coal gasification
kinetics
catalysts
Opis:
The aim of this study was to analyse the steam gasification process of ‘Janina’ coal with and without Na-, K- and Ca-catalysts. The catalysts were physically mixed with the coal due to the simplicity of this method, short time of execution and certainty that the amount of catalyst is exactly as the adopted one. The isothermal measurements were performed at 800, 900 and 950°C and a pressure of 1 MPa using thermovolumetric method. The obtained results enabled assessment of the effect of analysed catalysts on the process at various temperatures by determination of: i) carbon conversion degree; ii) yield and composition of the resulting gas; and iii) kinetics of formation reactions of main gas components – CO and H2. The addition of catalysts, as well as an increase in operating temperature, had a positive effect on the coal gasification process – reactions rates increased, and the process time was reduced.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 51-57
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reakcje i procesy katalityczne. Cz. II a
Autorzy:
Sarbak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/274391.pdf
Data publikacji:
2010
Wydawca:
Roble
Tematy:
procesy katalityczne
katalizatory
gęstość katalizatorów
catalytic processes
density of the catalysts
catalysts
Źródło:
LAB Laboratoria, Aparatura, Badania; 2010, 15, 1; 22-28
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts
Autorzy:
Kumar, P.
Joshi, P. C.
Kumar, R.
Powiązania:
https://bibliotekanauki.pl/articles/358729.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
green oxidizers
phase stabilization
thermal decomposition
thermo-kinetics
catalysts
Opis:
Potassium dinitramide (KDN) was incorporated in ammonium nitrate (AN) crystals in AN/KDN ratio of 90/10, 75/25 and 50/50 by a co-crystallization method. These mixtures were subjected to thermal decompositional studies (DSC-TG) using a Simultaneous Thermal Analyzer (STA). The catalysts used for the present studies were: i) cupric(II) oxide (CuO) and, ii) copper-cobalt based metal oxide (Cu-Co*). For all catalytic samples, 2% by weight percent of catalyst was added to the total weight of the samples. Thermal decomposition studies were carried out for all the oxidizer samples prepared. Thermal decompositional studies were carried out at three different heating rates, i.e. 3 K/min, 5 K/min and 10 K/min, and the kinetic parameters were computed using the model free Flynn-Wall-Ozawa equation. It has been observed that 50% KDN addition resulted in complete suppression of endothermicity indicating total supression of the phase changes of AN in this temperature range. Further, it was noticed that CuO acts as a better phase stabilizer for AN as compared to Cu-Co*. However, Cu-Co* considerably increased the net exothermic decompositional heat release (J/g) of AN.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 184-200
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polimery z pamięcią kształtu i ich otrzymywanie
Shape-memory polymers and their preparation
Autorzy:
Andrzejewski, Kewin
Czyżów, Wiktor
Jacewicz, Dagmara
Drzeżdżon, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2086740.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
polimery
synteza
katalizatory
zielona chemia
polymers
synthesis
catalysts
green chemistry
Opis:
SMP (shape-memory polymers) is an innovative class of programmable materials responsive to various stimuli. They are attracting increasing attention regarding possible new inventions, industrial use, and overall polymer research. After a brief introduction, this article examines the conventional shape-memory effect, methods of fabrication of shape memory polymers, and molecular and structural requirements for SMP to function. The shape memory behavior of such polymers is thoroughly presented, with the focus being on the thermo- and photo-induced SME. The uses in biomedical and industrial areas are also discussed.
Źródło:
Wiadomości Chemiczne; 2022, 76, 3-4; 183--205
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie spektroskopii w podczerwieni w adsorpcji i katalizie (I)
Application of infrared spectroscopy in adsorption and catalysis (I)
Autorzy:
Sarbek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/171796.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
spektroskopia IR
chemisorpcja
adsorbenty
katalizatory
IR spectroscopy
chemisorption
adsorbents
catalysts
Opis:
The review presents some key results of infrared investigations of adsorbents and catalysts, which were obtained in Laboratory of Adsorption and Catalysis at Adam Mickiewicz University – conducted under the author guidance. After short introduction, review is divided into seven parts. In the first chapter, there was described an application of infrared method devoted to examination of structure of different types of zeolites, such as A, X, Y and mordenite as well as alumina and fly ashes and their modifications. Moreover, some results were presented on cobalt–molybdena catalysts supported on alumina. In the next chapter chemisorption of pyridine and t-butylnitrile (TBN) molecules on the alumina and alumina modified with fluoride and sodium ions as well as Co(Ni)-Mo(W) catalysts supported on alumina were investigated. In the last case intensity of some spectra were correlated with catalytic activity for cumene cracking. Another set of experiments were devoted to transesterification on dealuminated mordenites containing cations of alkaline earths elements and correlation with infrared results. In the next part of review, chemisorption of ethanol was presented. It was concluded, that during chemisorption of ethanol different surface species were produced on alumina, silicaalumina and zeolites X and ZSM-5. In separate chapter, it was considered oligomerization of different alkenes on Phillips catalyst using IR methods. In the last chapter, ways of chemisorption of dihydrobenzenes on cobalt-molybdena catalyst were examined using IR reflectance spectra. It seems that above presented results based on infrared examination will help to better understand adsorbents and catalysts structure and their action during adsorption and catalytic reactions.
Źródło:
Wiadomości Chemiczne; 2011, 65, 5-6; 363-394
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and characterization of multi-walled carbon nanotubes grown on transition metal catalysts
Autorzy:
Pełech, I.
Narkiewicz, U.
Kaczmarek, A.
Jędrzejewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/779825.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
catalysts
carbon nanotubes
chemical vapor deposition
X-ray diffraction
thermogravimetry
Opis:
Transition metal catalysts (mainly: iron, cobalt and nickel) on various supports are successfully used in a largescale production of carbon nanotubes (CNTs), but after the synthesis it is necessary to perform very aggressive purification treatments that cause damages of CNTs and are not always effective. In this work a preparation of unsupported catalysts and their application to the multi-walled carbon nanotubes synthesis is presented. Iron, cobalt and bimetallic iron-cobalt catalysts were obtained by co-precipitation of iron and cobalt ions followed by solid state reactions. Although metal particles were not supported on the hard-to-reduce oxides, these catalysts showed nanometric dimensions. The catalysts were used for the growth of multi-walled carbon nanotubes by the chemical vapor deposition method. The syntheses were conducted under ethylene - argon atmosphere at 700°C. The obtained catalysts and carbon materials after the synthesis were characterized using transmission electron microscopy (TEM), X-ray diffraction method (XRD), Raman spectroscopy and thermogravimetric analysis (TG). The effect of the kind of catalyst on the properties of the obtained carbon material has been described.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 117-122
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, properties and applications of CMK-3-type ordered mesoporous carbons
Autorzy:
Olchowski, Rafał
Dobrowolski, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2079960.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
CMK-3
SBA-15
adsorbents
batteries
catalysts
capacitors
controlled drug release
Opis:
For the last two decades the CMK-3-type carbon was the subject of study by researchers from all over the world for wide range of applications: adsorptive, catalytic, magnetic and electric. Changing of modification strategies resulted in obtaining carbonaceous materials with interesting properties. In this review the synthesis, properties and applications of the CMK-3-type nanocarbon are described.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 11-29
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System poprawy efektywności energetycznej i ekologicznej spalania paliw stałych
The system for improvement of watt-hour and environmental efficiency of solid fuel combustion
Autorzy:
Tic, W. J.
Powiązania:
https://bibliotekanauki.pl/articles/142297.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
katalizatory
spalanie
energetyka
ochrona środowiska
catalysts
combustion
power engineering
environmental protection
Opis:
W pracy przedstawiono osiągnięcia w dziedzinie rozwiązań proekologicznych w technologii spalania paliw konwencjonalnych. Zaprezentowane rozwiązania dotyczą paliw stałych. W procesie spalania istotna jest zarówno jakość zastosowanego paliwa, jak i warunki prowadzenia procesu. Efekty ekologiczne i energetyczne są wyznacznikami w doborze efektywnego katalizatora dla spalanego paliwa.
The article presents achievements in the field of ecological solutions for application in conventional fuel combustion technologies. The presented solutions apply to solid fuels. For the combustion process, both quality of used fuel and process conditions, are of importance. Ecological and energetic effects are indicators in the selection of efficient catalyst for the burned fuel.
Źródło:
Chemik; 2014, 68, 10; 850-855
0009-2886
Pojawia się w:
Chemik
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:
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
Tytuł:
Kompozyty uporządkowanych krzemionkowych materiałów mezoporowatych z rodziny M41S
Composites of ordered silica mesoporous materials from the M41S family
Autorzy:
Zabłocka, I.
Wysocka-Żołopa, M.
Powiązania:
https://bibliotekanauki.pl/articles/172593.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
uporządkowana mezoporowata krzemionka
kompozyty
katalizatory
sorbenty
polimery
ordered mesoporous silica
composites
catalysts
sorbents
polymers
Opis:
Report on the discovery of a new group of ordered mesoporous M41S molecular sieves initiated the extensive use of these materials in scientific research. There were 3 different pores differing in the pore system, generally called MCM (Mobil Composition of Matter): MCM-41 with hexagonal structure, MCM-48 with regular structure and MCM-50 with lamellar structure (Fig. 1). The first proposed synthesis of materials from the M41S group is based on the use of organic surfactants as matrices [4]. The applied modifications of the synthesis method allowed, among others for easy and fairly accurate control of morphology, change of physical properties of the obtained silicas and have an impact on time, cost and simplicity of execution [12, 16, 23–34]. They concerned the use of additional organic and inorganic substances [23–25], changes in reaction conditions [12, 16, 26–29], as well as the use of innovative surfactants [30–34]. Due to its porous structure, the mesoporous silica creates opportunities to improve the properties of many materials, which is why many composites have been synthesized with its used in catalysing, sorption or improving the properties of polymers. Mesoporous titanium catalysts (Ti-MCM-41) were used in the catalysis of the redox reaction or as photocatalysts [44–71]. In addition to titanium, other transition metals have also been introduced into the MCM-41 network, including vanadium, zirconium, niobium, iron, ruthenium, silver, nickel, tungsten [43, 72–98] used as catalysts in organic reactions or as catalysts in the ozonation process [ 99–111]. Polymer composites belong to hybrid materials made of an organic polymer matrix dispersed in inorganic silica. Conductive polymers such as polyaniline and polypyrrole are often used in mesoporous polymer composites due to the ability to conduct electric current [117–133]. The main use of composites with mesoporous silica in sorption processes is to use them to remove impurities from water and gases. MCM-48 composites with various amines were used in the carbon dioxide adsorption process, and composites with niobium and nickel in deodorization processes [141–155]. Synthesis of composites with organic compounds allows to obtain good adsorbents of heavy metals such as: lead, cadmium, arsenic, copper, nickel, zinc and mercury [146–152].
Źródło:
Wiadomości Chemiczne; 2018, 72, 11-12; 841-865
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kataliza homogeniczna
Autorzy:
Rachwalik, R.
Ogonowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/274399.pdf
Data publikacji:
2010
Wydawca:
Roble
Tematy:
katalizatory
korozja
jonon
kataliza homogeniczna
katalizator homogeniczny
homogeneous catalysis
homogeneous catalyst
corrosion
ionium
catalysts
Źródło:
LAB Laboratoria, Aparatura, Badania; 2010, 15, 1; 6-10
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of hydrogen perodixe - kinetics and review of chosen catalysts
Autorzy:
Pędziwiatr, P.
Mikołajczyk, F.
Zawadzki, D.
Mikołajczyk, K.
Bedka, A.
Powiązania:
https://bibliotekanauki.pl/articles/105966.pdf
Data publikacji:
2018
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
decomposition
hydrogen peroxide
catalysis
catalysts
silver catalyst
photocatalysis
dekompozycja
nadtlenek wodoru
kataliza
katalizatory srebrowe
fotokataliza
Opis:
Hydrogen peroxide is a chemical used in oxidation reactions, treatment of various inorganic and organic pollutants, bleaching processes in pulp, paper and textile industries and for various disinfection applications. It is a monopropellant, which, when purified, is self-decomposing at high temperatures or when a catalyst is present. Decomposing to yield only oxygen and water(disproportionation), hydrogen peroxide is one of the cleanest, most versatile chemicals available. The catalytic decomposition of hydrogen peroxide allows the use of various catalysts that will increase the rate of decomposition. Comparison and description of the most commonly used catalysts were presented in this review.
Źródło:
Acta Innovations; 2018, 26; 45-52
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reakcje i procesy katalityczne. Cz. XV b. Proces Fischera-Tropscha
Autorzy:
Sarbak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/274040.pdf
Data publikacji:
2014
Wydawca:
Roble
Tematy:
reakcja katalityczna
procesy katalityczne
synteza Fischera-Tropscha
katalizatory
catalytic reaction
catalytic processes
Fisher-Tropsch synthesis
catalysts
Źródło:
LAB Laboratoria, Aparatura, Badania; 2014, 19, 3; 22-25
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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