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Catalytic effects of inherent AAEM on char gasification: A mechanism study using in-situ Raman

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  • Yu, Junqin
  • Xia, Weidong
  • Areeprasert, Chinnathan
  • Ding, Lu
  • Umeki, Kentaro
  • Yu, Guangsuo

Abstract

Despite a small proportion of mineral in coal, inherent alkali and alkaline earth metals (AAEM) catalytically affected thermal conversion of coal. The gasification of raw and leached coal char was investigated by using an operando microscopic Raman spectroscopy to explore the effect of content and chemical form of the inherent AAEM on morphology and carbon structure evolution of a single particle during in-situ char gasification. The removal of water-soluble and ion-exchangeable AAEM reduced the R0.5 of SF, NM and YN char by 53.31%, 49.09% and 35.02%, respectively. As a result, the shrinkage of leached coal char progressed slower than that of the raw coal char. Besides, both water-soluble and ion-exchangeable AAEM accelerated char gasification because of an inhibition of the orderly evolution of carbon structure. Higher gasification temperature weakened the catalytic performance of ion-exchangeable AAEM. With the consumption of carbon, carbon microcrystalline structure of the residual char tended to be ordered, which led to a decrease in active free carbon sites for gasification reaction. Kinetic analysis indicated both water-soluble and ion-exchangeable AAEM reduced the activation energy of SF, NM and YN char by 20.97, 20.82 and 9.38 kJ∙mol−1, respectively, and the effect of ion-exchangeable AAEM was more significant.

Suggested Citation

  • Yu, Junqin & Xia, Weidong & Areeprasert, Chinnathan & Ding, Lu & Umeki, Kentaro & Yu, Guangsuo, 2022. "Catalytic effects of inherent AAEM on char gasification: A mechanism study using in-situ Raman," Energy, Elsevier, vol. 238(PC).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pc:s0360544221023227
    DOI: 10.1016/j.energy.2021.122074
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    References listed on IDEAS

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    1. Ruan, Renhui & Wang, Guan & Li, Shuaishuai & Wang, Min & Lin, Hui & Tan, Houzhang & Wang, Xuebin & Liu, Feng, 2024. "The effect of alkali and alkaline earth metals (AAEMs) on combustion and PM formation during oxy-fuel combustion of coal rich in AAEMs," Energy, Elsevier, vol. 293(C).
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    3. Hu, Fan & Xiong, Biao & Huang, Xiaohong & Liu, Zhaohui, 2023. "Theoretical analysis and experimental verification of diminishing the diffusion influence on determination of char oxidation kinetics by thermo-gravimetric analysis," Energy, Elsevier, vol. 275(C).

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