Comparison study on pyrolysis characteristics and kinetics of corn stover and its digestate by TG-FTIR

Zhang, Deli; Wang, Fang; Yi, Weiming; Li, Zhihe; Shen, Xiaoxu; Niu, Weisheng

doi:10.15376/biores.12.4.8240-8254

Cited by 15 publications

(4 citation statements)

References 39 publications

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“…No data for E α of digestates composed of SS and lignocellulosic biomass can be found in the literature. Nevertheless, some correlations could be made with swine manure digestate [45], corn stover digestate [88], roadside grass digestate [85], and other lignocellulosic rich digestates [25,44]. As shown in Table 4, the E α varied greatly with the type of feedstock.…”

Section: Activation Energy ( )mentioning

confidence: 99%

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Petrović

Vohl

Predikaka³

et al. 2021

Sustainability

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This study investigates the pyrolysis behavior and reaction kinetics of two different types of solid digestates from: (i) sewage sludge and (ii) a mixture of sewage sludge and lignocellulosic biomass—Typha latifolia plant. Thermogravimetric data in the temperature range 25–800 °C were analyzed using Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose kinetic methods, and the thermodynamic parameters (ΔH, ΔG, and ΔS) were also determined. Biochars were characterized using different chemical methods (FTIR, SEM–EDS, XRD, heavy metal, and nutrient analysis) and tested as soil enhancers using a germination test. Finally, their potential for biosorption of NH4+, PO43−, Cu2+, and Cd2+ ions was studied. Kinetic and thermodynamic parameters revealed a complex degradation mechanism of digestates, as they showed higher activation energies than undigested materials. Values for sewage sludge digestate were between 57 and 351 kJ/mol, and for digestate composed of sewage sludge and T. latifolia between 62 and 401 kJ/mol. Characterizations of biochars revealed high nutrient content and promising potential for further use. The advantage of biochar obtained from a digestate mixture of sewage sludge and lignocellulosic biomass is the lower content of heavy metals. Biosorption tests showed low biosorption capacity of digestate-derived biochars and their modifications for NH4+ and PO43− ions, but high biosorption capacity for Cu2+ and Cd2+ ions. Modification with KOH was more efficient than modification with HCl. The digestate-derived biochars exhibited excellent performance in germination tests, especially at concentrations between 6 and 10 wt.%.

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Section: Activation Energy ( )mentioning

confidence: 99%

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Petrović

Vohl

Predikaka³

et al. 2021

Sustainability

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“…The studied components are the carbon dioxide, carbon monoxide, H 2 O, methane, aldehydes and ketones, alcohols and esters. The mentioned compounds can be identified as C=O (2400-2250 cm −1 ), C-O (2250-2000 cm −1 ), O-H (4000-3400 cm −1 ), C-H (3000-2842 cm −1 ), C=O (1800-1684 cm −1 ) and C-O-H (1131-1058 cm −1 ) functional groups [28]. Observing the FTIR spectra, it was noted that the individual peak temperatures appeared around 350-380 • C; moreover, the main degradation occurred between 200 and 600 • C, resulting in a great number of organic volatiles in the devolatilization/pyrolysis zone.…”

Section: Ftir Analysismentioning

confidence: 99%

Determination of Kinetic and Thermodynamic Parameters of Biomass Gasification with TG-FTIR and Regression Model Fitting

Zsinka,

Tarcsay,

Miskolczi

2024

Energies

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In this study, the decomposition of five different raw materials (maize, wheat and piney biomass, industrial wood chips and sunflower husk) were investigated using the TG-FTIR method to obtain raw data for model-based calculations. The data obtained from the thermogravimetric analysis served as a basis for kinetic analysis with three different isoconversional, model-free methods, which were the KAS, FWO and Friedman methods. Afterwards, the activation energy and the pre-exponential factor were determined, and no significant difference could be identified among the used methods (difference was under 5%), achieving 203–270 kJ/mol of Ea on average. Thereafter, the thermodynamic parameters were studied. Based on the TG-FTIR data, a logistic regression model was fitted to the data, which gives information about the thermal degradation and the obtained components with different heating rates. The FTIR analysis resulted in differential peaks corresponding to the studied components that were detected within the temperature range of 350–380 °C. The primary degradation processes occurred within a broader temperature range of 200–600 °C. Accordingly, in this work, the use of logistic mixture models as an alternative to traditional kinetic models for the description of the TGA process was also investigated, reaching adequate performance in fitting by a validation data coefficient of determination of R2 = 0.9988.

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“…However, a major limitation of the DAEM is that it is difficult to estimate kinetic parameters due to complexity of the model. Also, it assumes that reaction proceeds through infinite and irreversible number of independent parallel reactions [55,56]. Kumar et al [57] reported that the Starink model uses approximation and empirical relation between reaction rate and temperature, hence other iso-conversional models such as Flynn-Wall-Ozawa (FWO) are considered to be better [57].The thermal pyrolysis/combustion of SD is considered an endothermic [39] and non-adiabatic process, as a result heat released can lead to a rapid rise in temperature alongside gas release [2].…”

Section: Introductionmentioning

confidence: 99%

“…To date there have been very few kinetic modelling studies for the pyrolysis of digestate [55,58], although these have only reported limited details of the feedstocks for the AD process.…”

Section: Introductionmentioning

confidence: 99%

Thermokinetic study of residual solid digestate from anaerobic digestion

Akor

Osman

Farrell

et al. 2021

Chemical Engineering Journal

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Anaerobic digestion (AD) has become an effective waste management method in the agri-food sector to dispose of livestock and food wastes. As AD becomes more widely used new challenges emerge, such as the disposal of digestate by-products. Currently, the principal method for handling solid digestate (SD) is direct application to land as an organic fertiliser. However, as the sector grows, this option is less viable due to nutrition loading on the land and increased eutrophication. This paper explores the potential of using SD, as a biofuel source. Additionally, the pyrolysis kinetic triplet of residual SD and thermal predictions was reported for the first time using Advanced Kinetics and Technology Solutions (AKTS) thermokinetics software to model and calculate the activation energy (Ea) and other kinetic parameters. ASTM-E698, Ozawa-Flynn-Wall and differential iso-conversional (model-free) methods were used and the Ea values calculated from each model were 169.8, 75 -175.0, and 85 -190.0 kJ mol -1 , respectively. The kinetic triplet can be used in the scale-up or designing of reactor systems considering SD as a feedstock. The kinetic prediction of isothermal pyrolysis of SD indicated that a temperature higher than 210 °C is required for onset of decomposition in the sample. Furthermore, SD has the potential to produce an additional ~27.9 MJ per day at a 500 kW standalone on-farm AD plant. This work has highlighted the potential of waste solid digestate as a potential solid biofuel that could add an additional revenue stream to AD plants and make them more sustainable.

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Comparison study on pyrolysis characteristics and kinetics of corn stover and its digestate by TG-FTIR

Cited by 15 publications

References 39 publications

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Pyrolysis of Solid Digestate from Sewage Sludge and Lignocellulosic Biomass: Kinetic and Thermodynamic Analysis, Characterization of Biochar

Determination of Kinetic and Thermodynamic Parameters of Biomass Gasification with TG-FTIR and Regression Model Fitting

Thermokinetic study of residual solid digestate from anaerobic digestion

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