Kinetic modeling of CO2 gasification of biochars prepared from Brazilian agro-industrial residues: effect of biomass indigenous mineral content

Pacioni, Tatiana Ramos; Soares, Douglas Verbicaro; Domenico, Michele Di; Alves, José Luiz Francisco; Virmond, Elaine; Moreira, Regina de Fátima Peralta Muniz; José, Humberto Jorge

doi:10.1007/s13399-021-01671-y

Cited by 11 publications

(4 citation statements)

References 58 publications

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“…As for slow pyrolysis biochar, it only had 10.91% volatile matter along with a high fixed carbon (85.85%) and ash content (2.27%). Similar results were claimed by Pacioni et al [22] who conducted slow pyrolysis of SCGs at 500 • C. These results show that temperature significantly impacted the proximate analysis results. To obtain char materials with low volatile matter, a high temperature should be applied.…”

Section: Properties Related To Energy Applicationsupporting

confidence: 88%

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Yang

Zhao

et al. 2023

Processes

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Coffee is among the most widely consumed beverages worldwide, leading to the annual generation of substantial quantities of spent coffee grounds (SCGs). This study explored the influence of fabrication methods on the properties and potential applications of the resulting biocarbon materials. Dry methods (torrefaction at 270 °C and slow pyrolysis at 500 °C) and wet methods (hydrothermal carbonization HTC at 210 °C and hydrothermal liquefaction HTL at 270 °C) were employed to fabricate SCG-based biochar and hydrochar, respectively. The carbonization degree followed the order of slow pyrolysis > HTL > HTC ≈ torrefaction, yielding significant differences in energy properties, elemental composition, morphology, and surface functionality. Slow pyrolysis biochar was suitable for energy applications due to a similar fuel ratio as and higher heating value than semianthracite coal. For agricultural applications, SCG biochar produced through dry methods could be utilized to mitigate acidic soil conditions, whereas HTC hydrochar, with its elevated surface area and porosity, could enhance soil microbiological diversity and water-holding capacity, as well as benefit environmental applications such as wastewater remediation. In summary, the findings of this study are anticipated to inform decision-making processes concerning sustainable waste management of SCGs and the exploration of carbon-based materials applications across diverse sectors.

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Section: Properties Related To Energy Applicationsupporting

confidence: 88%

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Yang

Zhao

et al. 2023

Processes

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“…However, it assumes that the reaction occurs at all active sites, which are uniformly distributed across the char particles, both inside and outside [10]. This model is basically a simplification of the gas-solid heterogeneous reaction, as noted by Pacioni et al [11]. The expression for the gasification reaction rate as predicted by the VRM is shown in Equation (1).…”

Section: Kinetic Analysismentioning

confidence: 99%

“…The activation energy values reported by other researchers were comparable. For example, 140.7 and 163.5 kJ/mol [10], 185.8 and 211.7 [11], and 100.4 and 127.9 kJ/mol [12].…”

Section: Determination Of Kinetic Parametersmentioning

confidence: 99%

“…They reported activation energies of 140.7 and 163.5 kJ/mol and pre-exponential factors of 2 × 10 5 and 4.22 × 10 4 s −1 for pine dust and wheat straw, respectively. Pacioni et al [11] performed a TGA study on coffee grounds and sawdust via the VRM. They reported activation energies of 185.8 and 211.7 kJ/mol and pre-exponential factor values of 3.32 × 10 5 and 7.93 × 10 6 s −1 for coffee grounds and sawdust, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Dioxide Gasification of Biochar: A Sustainable Way of Utilizing Captured CO2 to Mitigate Greenhouse Gas Emission

Ofuani,

Bhoi

2024

Sustainability

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This study proposes CO2 gasification of biochar as a potential carbon utilization pathway for greenhouse gas emission reduction. It aims to evaluate the effects of CO2 concentration on carbon and CO2 conversion and output CO yield. It also performs kinetic analysis, using the volume reaction model, to determine the activation energy and pre-exponential factor. The operating conditions utilized include gasification temperatures of 700, 800, and 900 °C; inlet CO2 concentrations of 15%, 30%, 45%, and 60% by volume (N2 balance); and a CO2 flow rate of 5 L/min. Carbon dioxide gasification of biochar was performed in a fixed bed batch reactor, and the composition of the output gases was analyzed. Increases in the temperature and inlet CO2 concentration both resulted in an increase in carbon conversion, with the maximum carbon conversion of 57.1% occurring at 900 °C and a 60% inlet CO2 concentration. The results also showed that CO2 conversion increased against temperature but decreased with an increasing inlet CO2 concentration. The maximum CO2 conversion of 76% was observed at 900 °C and a 15% inlet CO2 concentration. An activation energy in the range of 109 to 117 kJ/mol and a pre-exponential factor in the range of 63 to 253 s−1 were determined in this study.

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Upgrading of banana leaf waste to produce solid biofuel by torrefaction: physicochemical properties, combustion behaviors, and potential emissions

Alves

Silva

Sellin

et al. 2021

Environ Sci Pollut Res

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Kinetic modeling of CO2 gasification of biochars prepared from Brazilian agro-industrial residues: effect of biomass indigenous mineral content

Cited by 11 publications

References 58 publications

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Carbon Dioxide Gasification of Biochar: A Sustainable Way of Utilizing Captured CO2 to Mitigate Greenhouse Gas Emission

Upgrading of banana leaf waste to produce solid biofuel by torrefaction: physicochemical properties, combustion behaviors, and potential emissions

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