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Effects of alkali and alkaline earth metals of inherent minerals on Fe-catalyzed coal pyrolysis

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  • He, Renze
  • Deng, Jin
  • Deng, Xiaoling
  • Xie, Xiaoguang
  • Li, Yun
  • Yuan, Shenfu

Abstract

In this work, the effects of alkali and alkaline earth metals (AAEM (K, Na, Ca and Mg)) on Fe (5 wt%) loaded-coal pyrolysis were conducted using the fixed-bed reactor at 700 °C with 0.1 MPa N2. The coal was pretreated by HCl and HF aqueous solutions (De-2 coal). These effects were investigated with AAEM additive into Fe loaded De-2 coal. The results indicate that K, Na, Ca and Mg (0.1 wt%-1.5 wt%) enhanced the catalytic effect of Fe catalyst, leading to the high H2 selectivity (59.34 ml/g →85.94 ml/g), as well as the low yield toward CO2 (157.50 ml/g →148.62 ml/g), and the catalytic activity follows the order of Na ≈ K > Ca > Mg. Characterization results reveal that the inherent AAEM promote the reduction of Fe species and the dispersion of Fe particles. The reason for that was AAEM combined with oxygen-containing functional group generated C–O-AAEM and COO-AAEM, and released active oxygen sites to activate carbon sites, leading to Fe catalyst bound with active oxygen sites formed iron oxide and Fe-(O)–C on char surface. This study was helpful to understand the promotion mechanism of AAEM on Fe catalyzed coal pyrolysis.

Suggested Citation

  • He, Renze & Deng, Jin & Deng, Xiaoling & Xie, Xiaoguang & Li, Yun & Yuan, Shenfu, 2022. "Effects of alkali and alkaline earth metals of inherent minerals on Fe-catalyzed coal pyrolysis," Energy, Elsevier, vol. 238(PC).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pc:s0360544221022337
    DOI: 10.1016/j.energy.2021.121985
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    1. Qin, Tao & Lu, Qiuxiang & Xiang, Hao & Luo, Xiulin & Shenfu, Yuan, 2023. "Ca promoted Ni–Co bimetallic catalyzed coal pyrolysis and char steam gasification," Energy, Elsevier, vol. 282(C).
    2. Niu, Jian & Zhang, Huirong & Xu, Wenzhen & Guo, Yanxia & Li, Linbo & Cheng, Fangqin, 2024. "Utilization of inherent minerals in coal for high-performance activated carbon production: The mechanism of deSO2 and/or deNOx enhanced by in situ transformed calcium sulfide (CaS)," Energy, Elsevier, vol. 289(C).
    3. Niu, Jian & Miao, Jiawen & Zhang, Huirong & Guo, Yanxia & Li, Linbo & Cheng, Fangqin, 2023. "Focusing on the impact of inherent minerals in coal on activated carbon production and its performance: The role of trace sodium on SO2 and/or NO removal," Energy, Elsevier, vol. 263(PB).
    4. Deng, Jin & Gao, Shan & Yang, Tai & Ma, Duo & Luo, Xiaodong & Liu, Hui & Yuan, Shenfu, 2023. "Investigating the promotion of Fe–Co catalyst by alkali and alkaline earth metals of inherent metal minerals for biomass pyrolysis," Renewable Energy, Elsevier, vol. 213(C), pages 134-147.
    5. Ban, Yanpeng & Jin, Lijun & Wang, Kechao & Li, Yang & Yang, He & Hu, Haoquan, 2023. "Catalytic effect of industrial waste carbide slag on pyrolysis of low-rank coal," Energy, Elsevier, vol. 265(C).

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