Kinetic study on the CO2 gasification of biochar derived from Miscanthus at different processing conditions

Tian, Hong; Hu, Qingsong; Wang, Jiawei; Chen, Donglin; Yang, Yang; Bridgwater, Anthony V.

doi:10.1016/j.energy.2020.119341

Cited by 37 publications

(12 citation statements)

References 43 publications

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“…The above values also confirmed that decomposition of the torrefied hops waste sample is more complex. The values for the miscanthus sample are in agreement with those in the literature [97,100]. Likewise, for hops waste samples no experimental data have been found yet.…”

Section: The Pre-exponential Factorsupporting

confidence: 91%

“…The values were within the range of 14-224 kJ/mol and 60-221 kJ/mol for the Friedman and KAS models, respectively. The literature survey showed that the average activation energies for raw miscanthus reported in the literature are between 78 and 212 kJ/mol (determined by several kinetics models, including the KAS/FR methods) [97][98][99], which is close to the values achieved in this study. For instance, the activation energies reported by Cortés and Bridgwater [100] for raw and torrefied miscanthus were in the range of 129 to 156 kJ/mol using the same isoconversional models.…”

Section: Activation Energysupporting

confidence: 88%

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Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

et al. 2021

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The torrefaction process upgrades biomass characteristics and produces solid biofuels that are coal-like in their properties. Kinetics analysis is important for the determination of the appropriate torrefaction condition to obtain the best utilization possible. In this study, the kinetics (Friedman (FR) and Kissinger–Akahira–Sunose (KAS) isoconversional methods) of two final products of lignocellulosic feedstocks, miscanthus (Miscanthus x giganteus) and hops waste (Humulus Lupulus), were studied under different heating rates (10, 15, and 20 °C/min) using thermogravimetry (TGA) under air atmosphere as the main method to investigate. The results of proximate and ultimate analysis showed an increase in HHV values, carbon content, and fixed carbon content, followed by a decrease in the VM and O/C ratios for both torrefied biomasses, respectively. FTIR spectra confirmed the chemical changes during the torrefaction process, and they corresponded to the TGA results. The average Eα for torrefied miscanthus increased with the conversion degree for both models (25–254 kJ/mol for FR and 47–239 kJ/mol for the KAS model). The same trend was noticed for the torrefied hops waste samples; the values were within the range of 14–224 kJ/mol and 60–221 kJ/mol for the FR and KAS models, respectively. Overall, the Ea values for the torrefied biomass were much higher than for raw biomass, which was due to the different compositions of the torrefied material. Therefore, it can be concluded that both torrefied products can be used as a potential biofuel source.

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Section: The Pre-exponential Factorsupporting

confidence: 91%

Section: Activation Energysupporting

confidence: 88%

Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

et al. 2021

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“…The third-order kinetic model is rarely applied in biochar chemistry. However, Zahedifar and Moosavi [181] reported that it was unsuitable to explain the Zn desorption mechanisms from biochar-amended calcareous soils, while Tian et al [182] showed that the third-order kinetics can be efficaciously used to describe the mechanisms of the CO 2 gasification of Miscanthus-derived-biochar at different processing conditions.…”

Section: The Kinetics Of Biochar Adsorption/desorptionmentioning

confidence: 99%

Recent Developments in Understanding Biochar’s Physical–Chemistry

et al. 2021

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Biochar is a porous material obtained by biomass thermal degradation in oxygen-starved conditions. It is nowadays applied in many fields. For instance, it is used to synthesize new materials for environmental remediation, catalysis, animal feeding, adsorbent for smells, etc. In the last decades, biochar has been applied also to soils due to its beneficial effects on soil structure, pH, soil organic carbon content, and stability, and, therefore, soil fertility. In addition, this carbonaceous material shows high chemical stability. Once applied to soil it maintains its nature for centuries. Consequently, it can be considered a sink to store atmospheric carbon dioxide in soils, thereby mitigating the effects of global climatic changes. The literature contains plenty of papers dealing with biochar’s environmental effects. However, a discrepancy exists between studies dealing with biochar applications and those dealing with the physical-chemistry behind biochar behavior. On the one hand, the impression is that most of the papers where biochar is tested in soils are based on trial-and-error procedures. Sometimes these give positive results, sometimes not. Consequently, it appears that the scientific world is divided into two factions: either supporters or detractors. On the other hand, studies dealing with biochar’s physical-chemistry do not appear helpful in settling the factions’ problem. This review paper aims at collecting all the information on physical-chemistry of biochar and to use it to explain biochar’s role in different fields of application.

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“…25,44 Precisely, the pyrolysis rate, pressure, and thermal pre-treatment of the biomass also play a crucial role in the process. [45][46][47] While pyrolysis, especially the denoted intermediate pyrolysis, is the most used process, several other methods were reported such as hydrothermal carbonization, 48,49 high-temperature gasification, 50,51 or the microwave-assisted pyrolysis. 52 The primary research efforts should focus on the most efficient use of each type of biomass to obtain maximum yield and quality, as well as the most cost-effective ratio of these three products.…”

Section: Introductionmentioning

confidence: 99%