Influence mechanism of CaO on gasification characteristics and kinetic behaviors of carbon-CO2 reaction

Lan, Chenchen; Liu, Ran; Zhang, Shuhui; Lyu, Qing; Gao, Yanjia; Yan, Guangshi

doi:10.1016/j.fuel.2021.122583

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…The results showed that the Ca in lignite chars plays a catalytic role, while Ca deactivation occurs when the CO2 partial pressures are above 0.05 MPa at 825 °C and above 0.075 MPa at 850 °C, thus optimizing CO2 pressure and the reaction temperature is important to remove the effects of the Ca deactivation on the gasification reactivity. Lan et al [150] further proved that CaO exhibits a favorable catalytic effect on the char-CO2 gasification reaction. The reaction mechanism and kinetic analysis indicated that the adsorption of CaO on the surface of the carbon matrix makes the C-C bond length between active C atoms longer, increases the electronegativity and reaction activity, and decreases the structural stability, conducive to the occurrence of the carbon-CO2 gasification reaction.…”

Section: Coal Char-co 2 Gasificationmentioning

confidence: 99%

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

et al. 2023

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Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively new coal gasification (supercritical water gasification, plasma gasification, chemical-looping gasification, and decoupling gasification) in terms of their gasifiers, process parameters (such as coal type, temperature, pressure, gasification agents, catalysts, etc.), advantages, and challenges. The capacity and potential of hydrogen production through different coal gasification technologies are also systematically analyzed. In this regard, the decoupling gasification technology based on pyrolysis, coal char–CO2 gasification, and CO shift reaction shows remarkable features in improving comprehensive utilization of coal, low-energy capture and conversion of CO2, as well as efficient hydrogen production. As the key unit of decoupling gasification, this work also reviews recent research advances (2019–2023) in coal char–CO2 gasification, the influence of different factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the char–CO2 gasification performance are studied, and its reaction kinetics are also outlined. This review serves as guidance for further excavating the potential of gasification technology in promoting clean fuel production and mitigating greenhouse gas emissions.

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Section: Coal Char-co 2 Gasificationmentioning

confidence: 99%

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

et al. 2023

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“…The solid residue of the extraction process is one of the lignocellulose waste that can be developed as a carbon materials source for many applications such as adsorbent, catalyst, supercapacitor, electrocatalyst, and others [2][3][4][5][6]. Carbon from biomass can be synthesized through various methods such as pyrolysis, gasification, combustion, and hydrothermal carbonization (HTC) [7][8][9][10]. HTC is a promising method to convert avocado seed into a hydrochar because of its high-cellulose and lowlignin content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid-Assisted Hydrothermal Carbonization Temperatures on the Hydrochar Properties for Supercapacitor Application

Amelia,

Widiyastuti,

Setyawan

et al. 2023

KEM

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The investigation of biomass-based, cost-effective, efficient, and environmentally materials with high power density and fast ion/electron transfer is intensively carried out for the development of renewable energy storage devices. Pyrolysis and hydrothermal carbonization (HTC) are two common methods of thermochemical conversion to synthesize biomass-derived based carbon. Compared to the pyrolysis method, HTC is a more promising strategy because it can be carried out without a pre-drying process, has a high yield, low ash content, and requires a relatively low temperature (180-250 °C). The carbon produced from the HTC process is known as hydrochar. This study reports the acid-assisted hydrothermal carbonization temperature on the hydrochar properties and its application for supercapacitor electrodes. Hydrochar was synthesized from extracted avocado seed waste with potassium permanganate and sulfuric acid catalyst solution at 200 °C for 12 h. The effect of one- and two-stage HTC temperature on the hydrochar properties were compared. The hydrochar characterization includes yield, SEM, XRD, FTIR, and cyclic voltammetry analysis. According to the characterization and analysis results, hydrochar produced has the 3D porous network morphology and the highest specific capacitance of 73.54 F/g. In conclusion, hydrochar derived from avocado seed through the acid-assisted HTC can be a potential way for supercapacitor electrodes.

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