Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir, Kazi Bayzid; Tahmasebi, Arash; Bhattacharya, Sankar; Yu, Jianglong

doi:10.1007/s10973-015-5060-8

Cited by 22 publications

(10 citation statements)

References 32 publications

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“…Gasification is a technique for conversion of carbon feeds to usable fuels such as H2, CO, and CH4, and is of particular interest for feeds where the by-products emitted from combustion are of concern, such as coal [1][2][3][4][5][6] or bio-wastes [7][8][9]. Metallic species in the feed materials, including calcium and potassium, can be used as intrinsic gasification catalysts [10][11][12][13][14]. Calcium can be found in feeds such as biosolids/sewage sludge [15][16][17][18], coal [19][20][21][22], and biomass [10,23,24], while potassium is found in biomass with an order of magnitude higher abundance than typically found in coal [23,25] or biosolids [26,27].…”

Section: Introductionmentioning

confidence: 99%

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Arnold

Hill

2019

Fuel

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Gasification of carbon black, an ash-free carbon feed, was performed with K2CO3 and either CaCO3 or BaCO3 as catalysts to examine their interaction. Mixtures were prepared by low-energy ball-milling, and then gasified with CO2 at 750-850 °C in a thermogravimetric analyzer. At temperatures below 800 °C, the presence of calcium had little impact on the potassium-catalyzed gasification of carbon black. At higher temperatures, calcium promoted the activity of potassium up to ~50 % conversion through the formation of a eutectic phase that increased the diffusivity of the potassium. At higher conversions, the tendency of CaCO3 to sinter and limit diffusion of CO2 to the carbon inhibited the reaction. BaCO3 also formed a eutectic phase with K2CO3 confirming that the phase change was beneficial. In contrast to CaCO3, however, BaCO3 does not sinter at 850 °C, such that gasification was promoted to complete conversion.

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Section: Introductionmentioning

confidence: 99%

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Arnold

Hill

2019

Fuel

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“…As some researchers have reported, the pyrolysis heating rate and gasification temperature are dominant factors that have significantly influenced on gasification reactivity. However, the heating rate adopted in the previous work is lower than 50 o C/min in TG which is far different from real condition [2] . Besides, different rates of chars are first prepared in different instruments and then gasified in TG.…”

Section: Introductionmentioning

confidence: 86%

The Relationship Between Coal Char Reactivity and Char Structure at Rapid Heating Condition by TG and Heating Stage-Microscopy

Xiaoming¹,

Li²,

Liu³

et al. 2020

Preprint

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“…Limited studies are available in the literature where the pore diffusion effect is considered while determining kinetic parameters. Some studies (Kabir et al, 2016;Tanner and Bhattacharya, 2016) used a smaller particle size to eliminate pore diffusion effect. However, other influential parameters, for example, sample mass, reactant flow rate, and crucible configuration, were not optimized.…”

Section: A U T H O R P R O O Fmentioning

confidence: 99%

Effect of Pore Diffusion on the Gasification Characteristics of Coal Char Under Co2 Atmosphere

Shahabuddin

Kibria

Bhattacharya

2021

Inter J Ener Clean Env

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The effect of pore diffusion on kinetic parameters is of particular interest to the current study using coal char under CO2 gasification conditions. A high-temperature entrained-flow gasifier was used for the preparation of char through the rapid pyrolysis process. The kinetic study with the char was then carried at temperatures of 973-1473 K under atmospheric pressure. A prediction of carbon conversion for large particle size (100 µm) is reported from the carbon conversion of small particle size (25 µm) considering the diffusion effect. The effect of diffusion caused by temperatures and particle size was reported through activation energy. The apparent activation energy in the chemically controlled region (973-1173 K) was calculated to be 178 kJ/mol, whereas it was 69 kJ/mol in the pore diffusion zone (1373-1473 K) using smaller particle size. The apparent activation energy using large particle size was found to be 186 and 99 kJ/mol in chemically controlled and pore diffusion zone, respectively. The intrinsic activation energy for both particle sizes was almost similar. A variation between apparent and intrinsic reaction rates was depicted mostly at higher temperatures of over 1273 K. The change in the surface area of char particle was crucial in terms of decreasing reaction rates, which was decreased with the progression of the conversion. The predicted carbon conversion for large particle size was in good agreement with the experimentally measured conversion except for little discrepancies at higher temperatures.

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Intrinsic kinetics of CO2 gasification of a Victorian coal char

Cited by 22 publications

References 32 publications

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

The Relationship Between Coal Char Reactivity and Char Structure at Rapid Heating Condition by TG and Heating Stage-Microscopy

Effect of Pore Diffusion on the Gasification Characteristics of Coal Char Under Co2 Atmosphere

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