Exploring Açaí Seed (Euterpe oleracea) Pyrolysis Using Multi-component Kinetics and Thermodynamics Assessment Towards Its Bioenergy Potential

Alves, José Luiz Francisco; Silva, Jean Constantino Gomes da; Domenico, Michele Di; Galdino, Wendell Venício de Araújo; Andersen, Silvia Layara Floriani; Alves, Rosana Cardoso; Sena, Rênnio Félix de

doi:10.1007/s12155-020-10175-y

Cited by 37 publications

(14 citation statements)

References 44 publications

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“…The values of ln(A) for P-ET, P-HC1, P-HC2, P-CL, and P-LG, are 26.27, 36.25, 30.41, 28.31, and 39.00, respectively. The pre-exponential factors for the five pseudo-components are in the range of 2.56 × 10 11 to 8.66 × 10 16 min −1 (2.55 × 10 11 min −1 , 5.55 × 10 15 min −1 , 1.60 × 10 13 min −1 , 1.97 × 10 12 min −1 , and 8.65 × 10 16 min −1 for P-ET, P-HC1, P-HC2, P-CL, and P-LG, respectively), which are comparable with the range found for subbituminous coal, açaí seed waste, and reed canary [6,50,51]. The fluctuations are related to the magnitude of the preexponential factors that suggest a complex devolatilization reaction and confirm the hypothesis of several parallel devolatilization reactions [42,52].…”

Section: Estimation Of Pre-exponential Factorssupporting

confidence: 76%

“…The increase was from 145.47 to 270.69 kJ mol −1 , which can be associated with the presence of several reactions that occur in parallel together with the high thermal stability of C-C bonds, thus needing more energy to break the chemical bonds. These high E a values for pyrolysis of pseudolignin are reported for several biomasses (refer to Table 3), such as sugarcane bagasse (170.70 kJ mol −1 , average value) [8], pine-fruit shell (309.38 kJ mol −1 , average value) [3], and açaí seed waste (346.24 kJ mol −1 , average value) [6].…”

Section: Estimation Of Apparent Activation Energy By Vyazovkin Methodsmentioning

confidence: 66%

“…The ash content of 6.77 wt% in the cocoa shell (refer to Table 1) is in accordance with the typical composition of commercial biomass fuels (with a range from 0.6 to 9.8 wt%) [31] and is considerably lower than that of typical Brazilian coals (from 27.4 to 83.1 wt%) [32], which is an advantage for use in the thermochemical route. A low ash content implies a little possibility of incidence of operational problems that can limit mass and heat transfer, mainly at large-scale production, such as fouling and slagging [6]. The measured moisture content of the collected cocoa shell was less than 10 wt%, which is generally regarded as acceptable for biomass thermal conversion [31].…”

Section: Physicochemical Properties Of Cocoa Shellmentioning

confidence: 99%

“…Thermogravimetry is a technique often used to evaluate pyrolysis characteristics, such as thermal behavior, kinetic parameters, and thermodynamics parameters. The thermodynamic analysis is often recognized as an extension to kinetic valuation, and it is required to get an insight into the pyrolysis process in terms of energy requirements, which in turn is important in the design of a pyrolysis reactor at the large-scale process, as emphasized by previously published studies [4][5][6]. From the thermogravimetry data, it is possible to evaluate the kinetic parameters using different mathematical approaches.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of cocoa shell and its bioenergy potential: evaluating the kinetic triplet, thermodynamic parameters, and evolved gas analysis using TGA-FTIR

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Alves

Silva

et al. 2020

Biomass Conv. Bioref.

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This study presents the first attempt to focus on the cocoa shell pyrolysis in terms of kinetic triplet, thermodynamic parameters, and evolved volatile analysis using the TGA-FTIR technique. For reliable interpretation of the multistep pyrolysis of cocoa shell, the multiple kinetic triplets were adequately estimated by a combined kinetic procedure using five independent parallel reactions with the Vyazovkin isoconversional method, the compensation effect, and the master plot method. According to the results, the multiple kinetic triplets were able to describe the pyrolysis behavior of the cocoa shell with an accuracy of R 2 > 0.9446 and the pyrolysis mechanisms exhibited different reaction models (n-order and contracting cylinder). Evolved volatile analysis suggested the presence of high-energy compounds (aromatic) and useful chemicals (aldehyde, ketone, esters, ether, and alcohols). The pre-exponential factors for the five pseudo-components of cocoa shell pyrolysis ranged from 2.56 × 10 11 to 8.66 × 10 16 min −1 (derived from the compensation effect method), while the values of E a ranged from 99 to 271 kJ mol −1 . From a comparative analysis, it was found that the results from the compensation effect method ensured the overall kinetic expression to be consistent with the experimental cocoa shell pyrolysis behavior. In contrast, the overall kinetic expression using pre-exponential factors derived from Kissinger's method failed to match the experimental curves. The pyrolytic conversion of cocoa shell into bioenergy appeared as potentially viable (E a -ΔH ≤ 5.5 kJ mol −1 ). The promising findings on the cocoa shell pyrolysis can expand the use of this residue in bioenergy applications, consisting of a great attempt toward its valorization.

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Section: Estimation Of Pre-exponential Factorssupporting

confidence: 76%

Section: Estimation Of Apparent Activation Energy By Vyazovkin Methodsmentioning

confidence: 66%

Section: Physicochemical Properties Of Cocoa Shellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of cocoa shell and its bioenergy potential: evaluating the kinetic triplet, thermodynamic parameters, and evolved gas analysis using TGA-FTIR

Mumbach

Alves

Silva

et al. 2020

Biomass Conv. Bioref.

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“…The bulk density of seed samples at different conditions was determined as described by Alves and Da Silva [21]. Grain samples (50 g) were weighed into a 100 mL graduated measuring cylinder.…”

Section: Physicochemical and Functional Analyses 241 Bulk Densitymentioning

confidence: 99%

Optimization of Infrared Heating Conditions for Precooked Cowpea Production Using Response Surface Methodology

et al. 2021

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The infrared heating of preconditioned cowpea improves its utilization and potential application in food systems. This study investigated the effect of optimizing preconditioning and infrared heating parameters of temperature and time on cooking characteristics of precooked cowpeas using response surface methodology (RSM). The moisture level (32–57%), infrared heating temperature (114–185 °C), and time of processing the seeds (2–18 min) were optimized using a randomized central composite design to achieve optimal characteristics for bulk density and water absorption. A second-order polynomial regression model was fitted to the obtained data, and the fitted model was used to compute the multi-response optimum processing conditions, which were the moisture of 45%, the heating temperature of 185 °C, and time of 5 min. Precooked cowpea seeds from optimized conditions had a 19% increase in pectin solubility. The total phenolic and total flavonoid contents were significantly reduced through complexation of the seeds’ phenolic compounds with other macromolecules but nonetheless exhibited antioxidant properties capable of scavenging free radicals. There was also a significant reduction in phytate and oxalates by 24% and 42%, respectively, which was due to the heat causing the inactivation of these antinutrients. The obtained optimized conditions are adequate in the production of precooked cowpea seeds with improved quality.

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Kinetic and thermodynamics study of the pyrolytic process of the freshwater macroalga, Chara vulgaris

et al. 2021

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Exploring Açaí Seed (Euterpe oleracea) Pyrolysis Using Multi-component Kinetics and Thermodynamics Assessment Towards Its Bioenergy Potential

Cited by 37 publications

References 44 publications

Pyrolysis of cocoa shell and its bioenergy potential: evaluating the kinetic triplet, thermodynamic parameters, and evolved gas analysis using TGA-FTIR

Pyrolysis of cocoa shell and its bioenergy potential: evaluating the kinetic triplet, thermodynamic parameters, and evolved gas analysis using TGA-FTIR

Optimization of Infrared Heating Conditions for Precooked Cowpea Production Using Response Surface Methodology

Kinetic and thermodynamics study of the pyrolytic process of the freshwater macroalga, Chara vulgaris

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