Kinetic analysis and thermodynamics properties of air/steam gasification of agricultural waste

Fernandez, Anabel; Ortiz, Leandro Rodriguez; Asensio, Daniela Anabel; Rodríguez, Rosa; Mazza, Germán

doi:10.1016/j.jece.2020.103829

Cited by 78 publications

(14 citation statements)

References 74 publications

(114 reference statements)

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“…Particle size and mass of the cocoa shell sample were kept small to ensure the kinetically controlled regime during devolatilization. These variables agree with previous observations, which indicate that the use of small particle size at low heating rates in thermogravimetric experiments can eliminate heat transfer and intra-particle diffusion limitations [5,21]. The thermogravimetric data were corrected for the effect of buoyancy by performing a blank experiment for each heating rate condition.…”

Section: Thermogravimetric Analysissupporting

confidence: 86%

“…Thus, for the sample used in this study, the weight fractions of cellulose and lignin are reasonably close to the literature mentioned above. Particularly, the content of hemicellulose agreed very well with the content found for other lignocellulosic residues (18.8-21.5 wt%, on a dry ash-free basis) [5]. Regarding the lignin content, when compared with common agroindustrial residues [33], the value achieved for the cocoa shell is relatively high.…”

Section: Physicochemical Properties Of Cocoa Shellsupporting

confidence: 78%

“…ΔS values for pseudo-components are fluctuating between positive and negative signals during the pyrolysis for the cocoa shell, which can indicate a complex reaction to produce bioenergy. This is a typical behavior for the pyrolysis of lignocellulosic biomass [5,42]. Thermodynamic properties suggested that the cocoa shell waste is an interesting candidate for bioenergy conversion through pyrolysis.…”

Section: Thermodynamic Implicationsmentioning

confidence: 90%

“…The sample was first washed to remove physical impurities (sand, dust, and mud) and then oven-dried overnight at 378 K. The dried cocoa shell was grounded in a cutting mill (Solab, SL-31, Piracicaba, Brazil) and sieved to obtain a particle size smaller than 150 μm using a mechanical sieve shaker (Bertel, São Paulo, Brazil). The choice for small particle size (< 150 μm) is often indicated for thermogravimetric experiments to reduce heat and mass transfer limitations, as observed in previous studies [5,21]. The cocoa shell sample (with particle size below 150 μm) was kept in a tightly closed plastic container until the characterization and pyrolysis experiments.…”

Section: Preparing and Characterizing The 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

Mumbach

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: Thermogravimetric Analysissupporting

confidence: 86%

Section: Physicochemical Properties Of Cocoa Shellsupporting

confidence: 78%

Section: Thermodynamic Implicationsmentioning

confidence: 90%

Section: Preparing and Characterizing The Cocoa Shellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Valorization of Grape By‐Products

Rodriguez,

Mazza,

Fabani

et al. 2023

Nutraceutics From Agri‐Food By‐Products

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Pyrolysis of Phragmites hirsuta study on pyrolysis characteristics, kinetic and thermodynamic analyses

Liu

Zhang

Zhao

et al. 2021

Intl J of Energy Research

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This study is dedicated to the pyrolysis behavior and kinetic characteristics of bioenergy potential Phragmites hirsuta (root, stem and leave) by thermogravimetric analyzer using five different heating rates (10, 20, 30, 40, 50 C/ min). The pyrolysis of three parts can be divided into dehydration, volatilization and carbonization, which the main decomposition temperature was 280 C to 350 C with weight losses of 60%. Kinetics thermodynamic characteristics were carried out using three model-free iso-conversional methods, including Flynn-Wall-Ozawa, DAEM and Friedman methods, in which the activation energy of root, stem and leaf were 130 to 177, 128 to 159 and 124 to 157 kJ/mol, respectively. The activation energy in the root higher than stem and leaf indicated higher reactivity of the pyrolysis. The reaction mechanisms of root, stem and leaf fit well with different Avarami-Erofeev reaction models.The pyrolysis of different parts can be separately resolved into three pyrolysis peaks, which represent the pyrolysis of hemicellulose, cellulose and lignin, respectively. The corresponding temperature of hemicellulose pyrolysis peak is leaf < stem < root. This research will provide theoretical basis for high-value utilization of biomass and new ideas for selective pyrolysis of biomass.

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Kinetic analysis and thermodynamics properties of air/steam gasification of agricultural waste

Cited by 78 publications

References 74 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

Valorization of Grape By‐Products

Pyrolysis of Phragmites hirsuta study on pyrolysis characteristics, kinetic and thermodynamic analyses

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