Catalytic pyrolysis of Chlorella vulgaris: Kinetic and thermodynamic analysis

Fong, Melissa Jia Bao; Loy, Adrian Chun Minh; Chin, Bridgid Lai Fui; Lam, Man Kee; Yusup, Suzana; Jawad, Zeinab Abbas

doi:10.1016/j.biortech.2019.121689

Cited by 75 publications

(29 citation statements)

References 23 publications

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“…This shows that the Rh-Pt/CeO 2 -SiO 2 catalyst is promising for the use in biomass thermal degradation processes and may offer lower energy requirements. Besides, those values are comparable with the values of catalytic pyrolysis reported by Fong et al [60] over HZSM-5 zeolite/limestone for algae biomass (between 145 and 156 kJ mol −1 ) and those of in-situ catalytic pyrolysis of rice husk over Ni powder catalyst reported by Loy et al [61] (between 50 and 163 kJ mol −1 ), all of them obtained by model free methods. In the absence of catalyst, c i0 calculated values for decomposition of Component 1 ( Table 3) are similar because dehydration and volatile released products at lower temperatures are the same for both atmospheres [44]; as it was analized in previous Sections (2.3 and 2.4).…”

Section: Kinetic Modelsupporting

confidence: 90%

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Kinetics of the Catalytic Thermal Degradation of Sugarcane Residual Biomass Over Rh-Pt/CeO2-SiO2 for Syngas Production

et al. 2020

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Thermochemical processes for biomass conversion are promising to produce renewable hydrogen-rich syngas. In the present study, model fitting methods were used to propose thermal degradation kinetics during catalytic and non-catalytic pyrolysis (in N2) and combustion (in synthetic air) of sugarcane residual biomass. Catalytic processes were performed over a Rh-Pt/CeO2-SiO2 catalyst and the models were proposed based on the Thermogravimetric (TG) analysis, TG coupled to Fourier Transformed Infrared Spectrometry (TG-FTIR) and TG coupled to mass spectrometry (TG-MS). Results showed three different degradation stages and a catalyst effect on product distribution. In pyrolysis, Rh-Pt/CeO2-SiO2 catalyst promoted reforming reactions which increased the presence of H2. Meanwhile, during catalytic combustion, oxidation of the carbon and hydrogen present in biomass favored the release of H2O, CO and CO2. Furthermore, the catalyst decreased the overall activation energies of pyrolysis and combustion from 120.9 and 154.9 kJ mol−1 to 107.0 and 138.0 kJ mol−1, respectively. Considering the positive effect of the Rh-Pt/CeO2-SiO2 catalyst during pyrolysis of sugarcane residual biomass, it could be considered as a potential catalyst to improve the thermal degradation of biomass for syngas production. Moreover, the proposed kinetic parameters are useful to design an appropriate thermochemical unit for H2-rich syngas production as a non-conventional energy technology.

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Section: Kinetic Modelsupporting

confidence: 90%

“…On the contrary, during pyrolysis, the final weight fraction at 900 • C was higher, as carbonaceous compounds (fixed carbon) remained unreacted even at higher temperatures increasing the final biochar. Nonetheless, the final solid fraction of 20 wt% is similar to that reported for wood sawdust [45] and Chlorella vulgaris [60].…”

Section: Tg Analysissupporting

confidence: 84%

Kinetics of the Catalytic Thermal Degradation of Sugarcane Residual Biomass Over Rh-Pt/CeO2-SiO2 for Syngas Production

et al. 2020

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“…Linear approximation of Vyazovkin (V) that was selected for this research is based on the Coats-Redfern basis concepts of approximation, which generates an integral of temperature equation in Eq. (12.15) [14] below. (12.15) By rearranging and introducing ln to both sides of the equation, the finalized expression of the equation is presented in Eq.…”

Section: Vyazovkinmentioning

confidence: 99%

Iso-conversional kinetic and thermodynamic analysis of catalytic pyrolysis for palm oil wastes

Hii¹,

Chin²,

Majing³

et al. 2022

Value-Chain of Biofuels

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“…İntegral yöntemler için kullanılan genel denklem, Denklem (5)'in integralinin alınmasıyla elde edilir [30].…”

Section: Kinetik Hesaplamalarunclassified

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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Catalytic pyrolysis of Chlorella vulgaris: Kinetic and thermodynamic analysis

Cited by 75 publications

References 23 publications

Kinetics of the Catalytic Thermal Degradation of Sugarcane Residual Biomass Over Rh-Pt/CeO2-SiO2 for Syngas Production

Kinetics of the Catalytic Thermal Degradation of Sugarcane Residual Biomass Over Rh-Pt/CeO2-SiO2 for Syngas Production

Iso-conversional kinetic and thermodynamic analysis of catalytic pyrolysis for palm oil wastes

Kavun çekirdeği pirolizine ait kinetik parametrelerin ve termodinamik özelliklerin belirlenmesi

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