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Wyszukujesz frazę "thermogravimetric" wg kryterium: Temat


Tytuł:
Kinetics of Zinc Evaporation in Inert and Reducing Gases
Autorzy:
Łabaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/352863.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
evaporation
flux
zinc
thermogravimetric analysis
Opis:
The article presents the results of studies on the rate of zinc evaporation in the atmosphere of helium and carbon monoxide (II) carried out with the thermogravimetric method. The estimated values of zinc streams were compared with the values determined based on theoretical relationships.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 533-537
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Thermal Degradation Behavior of Siliceous Agriculture Waste (Rice Husk, Wheat Husk and Bagasse)
Autorzy:
Javed, S. H.
Aslam, U.
Mohsin, M.
Masooma, M.
Riaz, S.
Munir, Z.
Powiązania:
https://bibliotekanauki.pl/articles/778873.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Siliceous agriculture waste
Thermogravimetric Analyzer
amorphous silica
Opis:
Various siliceous agriculture waste (SAW) such as rice husk, wheat husk and bagasse have been investigated to study their thermal degradation behavior using Thermogravimetric Analyzer (TGA) technique. The focus of this research is to conduct TGA of raw and acid treated (20% HCl & 1M H2SO4) SAW at heating rate 10°C/min in the atmosphere of nitrogen. The results were analyzed on the basis of thermograms and it was inferred that 24 hours soaking with 20% HCl prior to thermal degradation enhanced the percent weight loss. The process also improved the percentage of residual weight of SAW indicating the extraction of amorphous silica with increased purity. The effect of acid treatment was verified by determining chemical composition of SAW samples before and after soaking with 20% HCl. Proximate analysis, thermal degradation temperature ranges and percentage of residual weight at 800°C for each of rice husk, wheat husk and bagasse were also quantified to observe the thermal degradation behavior. XRF analysis was performed to observe the effect of acid treatment for extraction of pure silica.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 47-51
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiograficzne i termograwimetryczne badania pirolizy pojedynczej cząstki drewna
Pyrolysis analysis of a single wood particle
Autorzy:
Kaźmierski, P.
Wardach-Święcicka, I.
Tiutiurski, P.
Kardaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/2073378.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
piroliza
radiografia
termograwimetria
pyrolysis
radiography
thermogravimetric analysis
Opis:
Opisano proces pirolizy pojedynczej cząstki drewna. Za pomocą termograwimetrii, badań w piecu wysokotemperaturowym oraz metod radiograficznych przeprowadzono analizę procesu pirolizy. Analizowano szybkość dekompozycji termicznej i jej stopień w funkcji czasu. Badano poddane pojedyncze próbki w formie sosnowych sześcianów o boku 18 mm. Analiza termograwimetryczna mająca na celu wyznaczenie przedziałów, w jakich zachodzi proces, poprzedziła badania wykonane w piecu wysokotemperaturowym. Próbki po eksperymentach zostały poddane badaniom radiograficznym celem zobrazowania zmian gęstości drewna w funkcji czasu. Na zdjęciach zaobserwowano, iż piroliza zachodzi od naroży próbki, a następnie pozostaje tylko niespirolizowany rdzeń w środku próbki. Badania potwierdziły duże możliwości radiografii w ocenie pirolizy.
Pyrolysis process of a single wood particie is described in the paper. Thermogravimetric and radiography techniques and pyrolysis in a high-temperature kiln were applied in the experiments. The thermal decomposition rate as a function of time was analyzed. Pine cubes with a side of 18 mm were used as samples. High-temperature kiln tests were preceded by thermogravimetric analysis aiming to determine temperature ranges in which the process took place. The samples after tests were analyzed using radiographic methods to visualize the changes in wood density as a function of time. It was observed on the photographs that pyrolysis started from sample corners, while only a core in the center of samples remained unchanged. Radiography experiments have a big potential in pyrolysis research.
Źródło:
Inżynieria i Aparatura Chemiczna; 2017, 6; 202--204
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena przydatności wybranych adsorbentów do separacji dwutlenku węgla w układach próżniowych - testy termograwimetryczne
Evaluation of adsorbents usability for carbon dioxide separation in vacuum systems - thermogravimetric tests
Autorzy:
Bukalak, D
Wawrzyńczak, D
Majchrzak-Kucęba, I
Powiązania:
https://bibliotekanauki.pl/articles/296689.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
adsorbenty
adsorpcja
metody termograwimetryczne
adsorbents
adsorption
thermogravimetric methods
Opis:
Badania z zastosowaniem metod termo grawimetrycznych (układ TG-Vacuum) prowadzono pod kątem sprawdzenia przydatności wytypowanych adsorbentów do procesu wychwytu dwutlenku węgla z gazów spalinowych metodą VSA. Testy przeprowadzono na zeolicie 5A, na zeolicie 13X oraz na węglu aktywnym z łupin orzecha kokosowego w atmosferze dwutlenku węgla oraz w atmosferze spalin pochodzących z konwencjonalnego procesu spalania, tzn. 16% CO2, 3,5% O2,80,5% N2. Zakres badań obejmował: test stabilności termicznej adsorbentów, izotermiczny test adsorpcji, test programowanej temperaturowo adsorpcji oraz test wieloetapowej cyklicznej adsorpcji/desorpcji w układzie TG-Vacuum. Wybór odpowiedniego adsorbentu do stosowania w adsorpcyjnej instalacji separacji CO2 dokonywany jest na podstawie oceny jego pojemności sorpcyjnej, zdolności regeneracji, profili i kinetyki adsorpcji/desorpcji oraz stabilności termicznej. Wstępna ocena tych parametrów może zostać dokonana z wykorzystaniem metod termograwimetrycznych, będących szybkim i użytecznym narzędziem do określenia szczególnie pojemności sorpcyjnej oraz profili adsorpcji/desorpcji. Dla 100% CO2 największą pojemność sorpcyjną wynoszącą 130 mgCO2/g sorbentu stwierdzono dla zeolitu komercyjnego 13X, zaś najmniejszą dla węgla aktywnego AC - ok. 58 mgCO2/g sorbentu. W przypadku zastosowania mieszaniny gazowej o zawartości 16% CO2 stwierdzono niższe pojemności sorpcyjne w każdym z testowanych sorbentów. Pojemność sorpcyjna węgla aktywnego, podobnie jak zeolitów, obniża się gwałtownie wraz ze wzrostem temperatury.
The paper presents the results of tests carried outusing a thermogravimetric analyzer (TG-Vacuum system) to verify the suitability of selected adsorbents for carbon dioxide capture from flue gases in VSA process. Sorption capacity of solid sorbents of carbon dioxide was characterized in relation to the CO2 concentration. Zeolite 5A, zeolite 13X and coconut shell steam activated carbon were used in the study underconditions typical of flue gas content in the combustion process, i.e. 16% CO2, 3.5% O2,80.5% N2. The scope of the research included a thermal stability test of adsorbents, isothermal test of adsoption and multi-stage cyclic adsorption/desorption (TG-Vacuum system) test. Selection of a suitable adsorbent to be used in adsorption installation is made based on evaluation of its sorption capacity, ability to regenerate, adsorption/desorption profiles and stability in the number of cycles and the kinetics of adsorption/desorption process. Zeolite 13X exhibited the highest sorption capacity of 130 mg CO2/g sorbent (among the adsorbents tested) when the adsorption step was carried out in pure CO2. In the case of gas mixture containing 16% of CO2 a significant decrease in sorption capacity was observed for each sorbent. Similar by to zeolites, sorption capacity of the activated carbon decreases rapidly as the temperature rises.
Źródło:
Inżynieria i Ochrona Środowiska; 2012, 15, 3; 287-294
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Synthesis of Lithium Carbonate (Li2CO3) from Waste Acidic Sludge
Autorzy:
Choi, Dong Hyeon
Wang, Jei-Pil
Powiązania:
https://bibliotekanauki.pl/articles/351124.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lithium carbonate
thermogravimetric apparatus
lithium sulfate
carbon dioxide
Opis:
In this study, the synthesis of lithium carbonate (Li2 CO3 ) powder was conducted by a carbonation process using carbon dioxide gas (CO2 ) from waste acidic sludge based on sulfuric acid (H2 SO4 ) containing around 2 wt.% lithium content. Lithium sulfate (Li2 SO4 ) powder as a raw material was reacted with CO2 gas using a thermogravimetric apparatus to measure carbonation conditions such as temperature, time and CO2 content. It was noted that carbonation occurred at a temperature range of 800°C to 900°C within 2 hours. To prevent further oxidation during carbonation, calcium sulfate (CaO4 S) was first introduced to mixing gases with CO2 and Ar and then led to meet in the chamber. The lithium carbonate obtained was examined by inductively coupled plasma–mass spectroscopy (ICP-MS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and it was found that of lithium carbonate with a purity above 99% was recovered.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1351-1355
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of Potamogeton lucens macrophyte for generation of fuels and chemicals by pyrolysis
Autorzy:
Rather, Mushtaq Ahmad
Khan, Noor Salam
Gupta, Rajat
Powiązania:
https://bibliotekanauki.pl/articles/1193043.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Energy
Fuel
Kinetics
Thermogravimetric analysis
Pyrolysis
Potamogeton lucens
Macrophyte
Opis:
The study investigates pyrolysis potential of naturally dried macrophyte Potamogeton lucens for production of fuels and chemicals by thermogravimetric analysis (TGA). The kinetics of pyrolysis is studied under non-isothermal conditions in nitrogen atmosphere. The analysis of physiochemical properties viz. proximate analysis, ultimate analysis, heating value and fourier transform infrared spectroscopy (FTIR) of Potamogeton lucens was suggestive of upgradation of weed before it could serve as a fuel. Three different heating rates viz. 5, 15 and 20 °C/min were used in pyrolysis. Pyrolysis mainly took place in the temperature range of 177-377 °C. Activation energy (E) and pre-exponential factors (A) were calculated using the iso-conversional method. The results showed that the decomposition process exhibited two zones of constant apparent activation energies. The values ranged from 8.36 to 300.38 KJ/mol in the conversion range of 5-85%. The order of magnitudes of E and A in pyrolysis were conducive for the weed to serve as potential feedstock in generation of fuels and chemicals.
Źródło:
World Scientific News; 2016, 58; 34-47
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermogravimetric biomass-to-liquid processes
Autorzy:
Rostek, E.
Biernat, K.
Powiązania:
https://bibliotekanauki.pl/articles/242234.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
biomass
gasification
Thermogravimetric Analysiss
differential scanning calorimetry (DSC)
enthalpy
Opis:
The article presented forecasts for European biofuel production in processes BtL and WtL on the basis of thermochemical technological path. The paper presents the processes of pyrolysis and gasification of biomass leading to the preparation of liquid hydrocarbon fractions in the synthesis of Fischer-Tropsch and processes HTU. Based on the model Koufopanosa, made the right choice of methods to investigate the thermogravimetric kinetics of biomass gasification with a change of enthalpy and identification of degradation products in real time. Presents the results of preliminary tests conducted on the Simultaneous Thermal Analyzer STA 449 F3 Jupiter's Nietzsche. These studies were carried out for samples of cereal straw, crushed to a state of dry dust. Gasification process by subjecting the sample, the test set, recorded curves TG and DSC, and observing the changes in mass, temperature and enthalpy. These studies have been done to pre-determine the conditions under which it may begin the process of liquidation. The study was conducted in an atmosphere of argon / nitrogen and argon / carbon dioxide. The temperature regime provided that the samples were heated to the temperature of500 °C at the heating rate of 3 K/min. Argon was used as protective gas, and N2 and CO2 - as purge gas with flow rates of 30 ml/min. The results, along with discussion, are presented in graphs -derivatograms and charts showing the cumulative weight changes and changes in enthalpy of individual samples.
Źródło:
Journal of KONES; 2011, 18, 2; 377-383
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal decomposition characterization of supergene potassium-jarosite and sodium-jarosite minerals from the northern Tibetan Plateau, China
Autorzy:
Chen, L.
Powiązania:
https://bibliotekanauki.pl/articles/949691.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
potassium-jarosite
sodium-jarosite
thermogravimetric analysis
X-ray diffraction
Opis:
The thermal decomposition of supergene potassium-jarosite and sodium-jarosite samples from the weathering profiles of sulfide deposits in the northern Tibetan Plateau, China, was investigated. Electron microprobe, scanning electron microscopy, and X-ray diffraction analyses indicated the presence of nearly pure potassium-jarosite and sodium-jarosite. Thermogravimetric analysis of the potassium-jarosite sample revealed mass losses of 11.39 wt% at 443.0 °C, 20.99 wt% at 688.3 °C, and 3.18 wt% at 779.3 °C. The thermogravimetric analysis of sodium-jarosite revealed mass losses of 11.72 wt% at 447.5 °C, 21.32 wt% at 682.6 °C, and 3.70 wt% at 716.5 °C. The results provide no evidence for water-molecule loss below 400 °C, as has been reported previously for natural potassium-jarosite and sodium-jarosite. Thermal-decomposition mechanisms have been proposed for potassium-jarosite and sodium-jarosite based on X-ray diffraction analyses of samples obtained at distinct points along the respective thermal decomposition processes. A comparison of the thermal analysis patterns of potassium-jarosite and sodium-jarosite indicates that sodium-jarosite undergoes the initiation of lattice destruction at a higher temperature.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 459-466
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Study of the Thermal and Ballistic Properties of SMX
Autorzy:
Sizov, V. A.
Pleshakov, D. V.
Asachenko, A. F.
Topchiy, M. A.
Nechaev, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/358831.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
tetranitrate ester
burning rate
differential scanning calorimetry
decomposition
thermogravimetric analysis
Opis:
The high-density tetranitrate ester 1,4-dinitrato-2,3-dinitro-2,3-bis(nitratomethylene)butane (SMX) was synthesized. The methods of obtaining and isolating the intermediates were optimized. The differences between the syntheses of SMX by a four- and five-step scheme were investigated. Combustion of SMX and its catalysis was studied. The possibility of replacing NG as the main plasticizer in a double-base propellant composition was demonstrated. SMX particles were shown to have pronounced crystal faceting using scanning electron microscopy. The decomposition rate equation was determined. The amount of SMX decomposed under isothermal conditions (90 °C) was 0.8 wt.% after 60 min. Thermogravimetric analysis demonstrated that heating SMX results in two different processes – decomposition and evaporation, with SMX evaporating faster than it decomposes.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 1; 30-46
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism and kinetics oxidation of inconel 617 and 625 alloys
Autorzy:
Staszewska, K.
Scendo, M.
Powiązania:
https://bibliotekanauki.pl/articles/134738.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
inconel alloy
thermogravimetric analysis
thermodynamic parameters
parabolic rate constants
activation energy
Opis:
The mechanism and kinetics of oxidation of Inconel 617 and 625 alloys in air atmosphere were investigated. Materials were examined by the thermogravimetric method. The X-ray diffraction spectrometer (XRD) was used to observation change in chemical composition the oxide scales of Inconel alloys specimens. Oxidation kinetics was determined from weight-change measurements. The surface and microstructure of the sample were observed in an optical microscope (OM) and a scanning electron microscope (SEM). The results showed that the oxide scales of the alloys were compact and continuous. The layer were contained as the outer of Cr2O3, and the internal of NiCr2O4 spinel, NiO and other oxides. Oxides’ scales with good adherence were formed on the surface of alloys. The kinetics and thermodynamic parameters of oxides formation were calculated and discussed for both alloys.
Źródło:
Technical Issues; 2016, 1; 82-89
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł

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