Kinetic analysis of thermogravimetric data collected from bigger samples

Nowicki, Ł.; Markowski, Maciej

doi:10.2478/v10176-012-0008-z

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…The temperature ramp effect on TGA of polymeric systems (having poor thermal conductivity) results in small differences in onset temperatures. 55 The polymeric systems have generally a poor thermal conductivity in the range 0.1 to 0.4 W/mK and tend to show ramp effect.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)-the Complexat...mentioning

confidence: 99%

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Wong

Santhanam

Kandlikar

2018

J. Electrochem. Soc.

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We have demonstrated here that graphene quantum dots (GQD) bind to cobaltous ion giving it a flowery structure. As a result of this binding the cyclic voltammetric peak potential shows a cathodic shift with reference to unbound cobaltous ion. From the electrochemical data, it is estimated that Co 2+ is hexa coordinated with GQD to form the bound species. The electrochemical reduction of cobaltous ion is carried out using four baths. A spectrophotometric examination of aquo cobaltic solution shows a characteristic maximum at 508 nm that is absent when cobaltous ion is in GQD bath. Co composite has been galvanostatically deposited on metal substrates. Fourier transform infrared spectroscopy (FTIR) of Co bound GQD shows distinct peaks at 3246(broad) cm −1 , 2089 cm −1 , 1639 cm −1 , 1392 cm −1 , 1274 cm −1 , 1099 cm −1 , 536 cm −1 that can be attributed to Co-C stretching and C-C stretching. The thermogravimetric analysis (TGA) of the composite shows that it is thermally stable from decomposition up to 600 • C. The energy dispersion analysis (EDAX) of the deposited Co shows the presence of carbon and cobalt at 0.25 keV and 7.0 eV respectively. The electrochemically deposited graphene composite responds rapidly to a flowing hydrogen gas stream.

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Section: Fourier Transform Infrared Spectroscopy (Ftir)-the Complexat...mentioning

confidence: 99%

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Wong

Santhanam

Kandlikar

2018

J. Electrochem. Soc.

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“…Studi kinetika solid-state semakin penting dalam analisis termal dan membantu perhitungan parameter menggunakan persamaan Arrhenius dan untuk menentukan mekanisme reaksi dekomposisi. Pemanasan dengan kecepatan rendah lebih disarankan, namun juga tergantung pada jenis bahan dan kecepatan reaksinya (Nowicki & Markowski, 2012). Studi tentang stabilitas termal polimer sangat penting dalam desain produk polimer untuk mengetahui rentang suhu bahan tersebut agar dapat dipakai tanpa mengalami degradasi (Sholeh et al, 2015).…”

Section: Pendahuluanunclassified

Karakteristik termogravimetri dan kinetika dekomposisi EPDM dengan bahan pengisi carbon black

Mayasari

Yuniari

2016

MKKP

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The thermal characteristics of a material are important to learn in order to know the thermal stability of the materials. Ethylene propylene diene monomer (EPDM) is a synthetic rubber that is widely used in industry dueto its resistance to aging, ozone, and chemicals. The kinetic parameters and thermal decomposition of vulcanized EPDM were studied using thermogravimetric method with various vulcanization systems (efficient, semi-efficient, and conventional vulcanization system) and various carbon black (CB) as filler (50, 60, and 70 phr ABSTRAKKarakteristik termal suatu material penting untuk dipelajari untuk mengetahui stabilitas termal bahan tersebut. Etilen propilen diena monomer (EPDM) adalah salah satu karet sintetis yang banyak digunakan dalam industri karena ketahanan terhadap aging, ozon, dan kimia yang baik. Pada studi ini akan dipelajari parameter kinetika dan sifat dekomposisi termal vulkanisat EPDM dengan metode termogravimetri dari berbagai variasi sistem vulkanisasi (efisien, semi-efisien, dan konvensional) dan variasi carbon black (CB) (50,60, dan 70 phr) sebagai bahan pengisi. Dekomposisi terjadi dalam dua tahap; oksidasi EPDM dan hilangnya bahan mudah menguap kemudian dekomposisi EPDM. Parameter kinetika dekomposisi termal didekati dengan persamaan Coats Redfern. Energi aktivasi dan massa yang terdekomposisi meningkat dengan berkurangnya kandungan CB. Vulkanisat EPDM dengan bahan pengisi CB memiliki ketahanan cukup baik terhadap dekomposisi termal. Proses dekomposisi dapat dilihat secara detail pada paper ini.Kata kunci: EPDM, dekomposisi termal, kinetika, termogravimetri, carbon black. PENDAHULUANMaterial polimer yang telah mengalami proses pengolahan, penggunaan, dan penyimpanan akan mengalami degradasi karena pengaruh suhu dan waktu. Degradasi ini dapat disebabkan oleh bahan kimia seperti pemutusan ikatan dan oksidasi atau perubahan fisik yang menghasilkan bahan dengan sifat yang berbeda dalam struktur polimernya. Pada umumnya sifat fisika dan sifat mekanis akan menurun. Tingkat perubahan sifat termal oleh pengaruh suhu disebut sebagai ukuran stabilitas termal suatu bahan (Alneamah & Almaamori, 2015).EPDM adalah karet nonpolar dan memiliki sedikit ikatan tidak jenuh sehingga memiliki sifat ketahanan yang baik terhadap bahan kimia, cuaca, dan pengusangan. Rumus struktur EPDM dapat dilihat pada Gambar 1. EPDM adalah salah

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“…The analysis used is Thermogravimetric analysis (TGA) by measuring changes in mass and decomposition rate as a function of temperature. In analyzing thermogravimetry, the Arrhenius equation is used to determine the mechanism of the decomposition reaction [6]. The use of thermogravimetry is limited to observing the decrease in a solid mass and cannot observe gas and tar products [7].…”

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confidence: 99%

Pyrolysis Kinetic Analysis of Palm Kernel Shells Using Free Model Method: Effect of Heating Rate and Iron Ore Catalyst

Zulkania

Fitriani

Irawati

2023

Advances in Science and Technology

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The use of biomass as an alternative fuel to reduce the use of fossil fuels continues to increase, one of which is palm kernel shell (PKS) waste. This study investigated the pyrolysis reactivity of biomass samples (PKS) through thermogravimetric analysis. In addition, the pyrolysis mechanism is approached through the activation energy determined from the model used. This study utilized palm kernel shells as biomass with the addition of iron ore as a catalyst. The TGA test was carried out with variations in the catalyst composition (0, 10, and 15% of total mass) and heating rates (5, 10, and 15 °C/min) of the pyrolysis process. The kinetic parameter, E, was estimated using the independent model method, namely FWO (Flynn Wall Ozawa) and KAS (Kissinger Akahira Sunose). The study showed that the concentration effect on the conversion rate was almost the same for all concentrations in heating rate of 10 °C/men. The heating rate of 15 °C/min provided the highest conversion rate compared to the other two heating rates. Furthermore, the activation energy values fluctuated in the kinetic analysis using the FWO and KAS methods. Besides, the best fit is obtained from the conversion of 0.2-04 and 0.8-0.9.

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Kinetic analysis of thermogravimetric data collected from bigger samples

Cited by 4 publications

References 16 publications

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Karakteristik termogravimetri dan kinetika dekomposisi EPDM dengan bahan pengisi carbon black

Pyrolysis Kinetic Analysis of Palm Kernel Shells Using Free Model Method: Effect of Heating Rate and Iron Ore Catalyst

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