Reaction kinetics of char—CO2 gasification

Kwon, Tae-Wahn; Kim, Sang D.; Fung, D. P. C.

doi:10.1016/0016-2361(88)90350-x

Cited by 80 publications

(42 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The use of small particles (usually \500 lm [27]) is therefore more appropriate for a char-CO 2 kinetic study. Kwon et al [28] showed that the char-CO 2 reactivity increased with a decrease in particle size within the range of 180-1000 lm. Here, a much smaller size of coal particles (45-53 lm) was used to prepare the char.…”

Section: Resultsmentioning

confidence: 98%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

CO 2 gasification of Victorian (Morwell) brown coal char was studied using a thermogravimetric analyser (TG). Gasification kinetics of demineralised, Ca-loaded, and Fe-loaded Morwell char were also studied. The grain model and random pore model were used to fit the gasification data. The random pore model fitted the experimental data better than the grain model. The activation energy was 189.05 kJ mol -1 for the CO 2 gasification of Morwell coal char. With 2 % Ca loading, the activation energy increased to 204.53 kJ mol -1 due to lowering of the surface area. However, an order of magnitude increase in the pre-exponential factor indicated an increase in active reaction sites for the 2 % Ca-loaded sample, resulting in a net increase in gasification rate. 5 % Ca loading and 2 % Fe loading proved to be less effective in increasing the gasification rate. Analysis of the TG outlet gas also proved the effectiveness of 2 % Ca loading as a gasification catalyst.

show abstract

Section: Resultsmentioning

confidence: 98%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…However, the value similar to the data for other chars [21] suggests that the ash constituents may be influencing the char-CO 2 reaction. Kwon et al [196] reported that the activation energy for various ranks of coals (lignite to semi anthracite) ranged from 79.07 to 155.64 kJ/mol based on the non reactive core model. Kasaoka et al [52] reported that activation energy of char-CO 2 gasification for 23 kinds of coals in a quartz tube was in the range of 196e310 kJ/mol.…”

Section: Activation Energies and Rate Constantsmentioning

confidence: 99%

“…17. The comparison of the quantize method and random pore model with experimental results of CO 2 activation at 960 C [196].…”

Section: Summary and Suggestions (Recommendations)mentioning

confidence: 99%

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

Irfan

Usman

Kusakabe

2011

Energy

434

229

View full text Add to dashboard Cite

“…Many previous studies have been undertaken to characterize the kinetic mechanisms associated with the steam and dry char gasification reactions, C + H 2 O M CO + H 2 and C + CO 2 M 2CO, respectively, as well as the char combustion reactions C + O 2 M CO 2 and C + 1/2O 2 M CO. Of concern in the gasification studies have been the kinetics of key reaction paths at atmospheric [1][2][3][4][5][6][7][8][9][10][11][12][13] and elevated pressures [14][15][16][17][18][19][20][21], the inhibiting effects of H 2 and CO on carbon conversion rates [15,22,23,9,[24][25][26][27][28][29], the reductions in carbon conversion rates due to heat treatment [30], and the catalytic effects by the types of minerals present in coals [31][32][33]. Efforts to characterize the kinetic mechanism associated with the char combustion reaction have also been undertaken, with the temperature dependence of the key reaction pathways for CO and CO 2 formation [34][35][36][37][38][39][40][41]…”

Section: Introductionmentioning

confidence: 99%