Effect of particle size on thermal decomposition and devolatilization kinetics of melon seed shell

Ahmed, A.N. Khaleel; Afolabi, Eyitayo Amos; Garba, Mohammed Umar; Umaru, Musa; Mohammed, Abubakar; Kariim, I.

doi:10.1080/00986445.2018.1555530

Cited by 25 publications

(11 citation statements)

References 38 publications

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“…The activation energy varies from 84.90 to 303.91 kJ / mol in the conversion range of 0.1-0.9. In the literature, there are many studies available showing the activation energy values for various biomass samples such as melon seed shell [12], chestnut shell [9], pistachio nutshell [13], tobacco waste [14], duckweed sample [15], and coffee husks [16]. The obtained activation energy is between 74-288 kJ mol-1.…”

Section: Resultsmentioning

confidence: 99%

Pyrolytic Degradation Behavior of Biomass Seeds: Cherry And Peach Seed

Çoruh

Bayrakçeken

2020

Kocaeli Journal of Science and Engineering

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Pyrolytic degradation behavior of peach and sour cherry seed were investigated by thermal analysis techniques such as thermogravimetric (TG) and derivative thermogravimetric (DTG). Pyrolysis study of peach and sour cherry seed, which are the sources of plant biomass, were carried out under air flowrate of 10 mL.min -1 and heating rates of 2.5,5,10 and 20 K min -1 in the temperature range of 298-1173 K by means of thermal analysis techniques. The activation energy and pre-exponential factor were determined with different methods as Kissinger-Akahira-Sunose (KAS) and Flyn-Wall-Ozawa (FWO). Although the FWO method gives higher values, it was observed that all activation energy values calculated by both methods are compatible with each other. In addition, as the amount of volatile matter increases, the decomposition becomes difficult due to the increase in mass transfer resistance and pressure, so it was determined that the activation energy of the peach seed is higher than the sour cherry seed.

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Section: Resultsmentioning

confidence: 99%

Pyrolytic Degradation Behavior of Biomass Seeds: Cherry And Peach Seed

Çoruh

Bayrakçeken

2020

Kocaeli Journal of Science and Engineering

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“…In Table 2, the T onset of the samples that contained ZnCl 2 was higher, which may be because of the brittleness of the wood samples. The addition of ZnCl 2 changed the particle size of the modified sample powder, and DM/MA had a smaller particle size and was more easily dispersed in the wood matrix: the good interface between the chemicals and the wood matrix made the samples more sensitive to temperature changes [35,36]. The main degradation of carbohydrates in the wood occurred in the range of 200-400 • C, while the T max of the untreated samples was 348.21 • C, indicating that the degradation occurred earlier than in the untreated group (Table 2).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Study on Improving the Fixation Rate of Impregnated Poplar Wood with Maltodextrin and 1,3-Dimethylol-4,5-Dihydroxyethyleneurea

Cai

et al. 2019

Applied Sciences

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The impregnation of poplar wood (Populus adenopoda Maxim) with 1,3-dimethylol-4,5-dihydroxyethyleneurea and maltodextrin and the effects of ZnCl2 and curing at 103 °C and 120 °C on the fixation rate and the leaching resistance of modified samples were investigated (103 °C curing, ZnCl2 + 103 °C curing, 120 °C curing, and ZnCl2 + 120 °C curing are denoted as 103, ZC-103, 120, and ZC-120, respectively), with the aim of improving the modification effect. The results showed that ZC-103 had the highest fixation rate, and its weight leaching ratio was higher than that of 120. Fourier-transform infrared spectroscopy showed that ZnCl2 did not affect the functional groups of the modified chemicals. The flexural strength and modulus and the compressive strength perpendicular to the grain were highest for ZC-103. In summary, ZC-103 exhibited the highest fixation rate, indicating that the hardener ZnCl2 bridged and increased the interfacial properties between the chemicals and cell walls and therefore increased the potential for macromolecule polycondensation between the chemicals and cell wall materials. This research paves the way for improving the fixation rate of impregnated wood and provides new insights into practical applications.

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“…Kavun üretiminin miktarıyla orantılı olarak kavun çekirdeği biyokütle atık madde olarak ortaya çıkmaktadır. Kavun çekirdeği (Citrullus colocynthis L.) cucurbitaceae familyasından Citrullus cinsine aittir ve %53 oranında yağ, %28 oranında protein içermektedir [11]. Kavun çekirdeğinden elde edilen yağ, başta evsel tüketim olmak üzere, tıbbi amaçlarla ve biyodizel, sabun, deterjan, margarin üretimi gibi endüstriyel uygulamalarda da kullanılmaktadır [12].…”

Section: Introductionunclassified

“…Kavun çekirdeğinin biyoyakıt potansiyeli daha önceki bir çalışmada açıklanmıştır [21]. Yapılan literatür araştırması mevcut çalışmaların kavun çekirdeği kabuğu ile ilgili olduğunu [11,12,22]; kavun çekirdeğinin piroliz kinetiği ile ilgili bir çalışmanın ise bulunmadığını ortaya koymuştur. Bu çalışmada, kavun çekirdeklerinin piroliz koşullarında elde edilen termogravimetrik analiz verileri üzerinden kinetik parametrelerinin ve termodinamik özelliklerinin hesaplanması amaçlanmıştır.…”

Section: Introductionunclassified

Kavun çekirdeği pirolizine ait kinetik parametrelerin ve termodinamik özelliklerin belirlenmesi

Açikalin¹,

Gözke²

2021

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Bu çalışmanın amacı, kavun çekirdeği pirolizinin davranışını incelemek ve kinetik parametreleri ile termodinamik özelliklerini hesaplamaktır. Termogravimetrik analiz deneyleri azot atmosferinde çevre sıcaklığından 800°C'ye 5, 10, 20 ve 40°C/dk ısıtma hızlarında çalışılmıştır. Piroliz prosesinin, ikinci ve üçüncü basamakları aktif piroliz basamağı olan dört basamakta gerçekleştiği tespit edilmiştir. Kinetik hesaplamalar model içermeyen Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Starink ve model bazlı Coats-Redfern yöntemi ile gerçekleştirilmiştir. İkinci ve üçüncü basamaklara ait görünen aktivasyon enerjisi değerlerinin sırasıyla, 123.9-215.5 ve 141.9-234.2 kJ/mol aralıklarında olduğu hesaplanmıştır. Coats-Redfern yöntemi, ikinci ve üçüncü basamakların sırasıyla F1.65 ve D5 reaksiyon mekanizmalarına uyduğunu ortaya koymuştur. Ayrıca, 10°C/dk ısıtma hızında gerçekleştirilen piroliz prosesinin aktif piroliz basamakları için, model içermeyen kinetik yöntemlerden hesaplanan sonuçlar kullanılarak entalpi, entropi ve Gibbs enerji değişimleri hesaplanmıştır. Mevcut çalışmada elde edilen sonuçlar, kavun çekirdeği piroliz proseslerinin tasarlanmasında gerekli olan bilgileri sağlamada faydalı olacaktır.The aim of this study is to examine the behaviour of melon seed pyrolysis and to calculate its kinetic parameters along with thermodynamic properties. The thermogravimetric analysis experiments were conducted from ambient temperature to 800°C under nitrogen atmosphere at the heating rates of 5, 10, 20 and 40°C/min. It was determined that the pyrolysis process underwent through four stages where the second and third stages were the active pyrolysis stages. Kinetic calculations were carried out using modelfree Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Starink and model-based Coats-Redfern methods. The apparent activation energy values of the second and third stages were calculated to be in the ranges of 123.9-215.5 and 141.9-234.2 kJ/mol, respectively. The Coats-Redfern method demonstrated that the second and third stages fit the reaction mechanisms of F1.65 and D5, respectively. Moreover, the enthalpy, entropy and Gibbs energy changes of the active pyrolysis stages performed at 10°C/min heating rate were determined using the results calculated from the model-free kinetic methods. The results obtained in the present study will be useful to provide necessary information needed for the design of melon seed pyrolysis processes.

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Effect of particle size on thermal decomposition and devolatilization kinetics of melon seed shell

Cited by 25 publications

References 38 publications

Pyrolytic Degradation Behavior of Biomass Seeds: Cherry And Peach Seed

Pyrolytic Degradation Behavior of Biomass Seeds: Cherry And Peach Seed

Study on Improving the Fixation Rate of Impregnated Poplar Wood with Maltodextrin and 1,3-Dimethylol-4,5-Dihydroxyethyleneurea

Kavun çekirdeği pirolizine ait kinetik parametrelerin ve termodinamik özelliklerin belirlenmesi

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