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Optimization of process parameters for preparation of powdered activated coke to achieve maximum SO2 adsorption using response surface methodology

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Abstract

Powdered activated coke (PAC) is a good adsorbent of SO2, but its adsorption capacity is affected by many factors in the preparation process. To prepare the PAC with a high SO2 adsorption capacity using JJ-coal under flue gas atmosphere, six parameters (oxygen-coal equivalent ratio, reaction temperature, reaction time, O2 concentration, CO2 concentration, and H2O concentration) were screened and optimized using the response surface methodology (RSM). The results of factor screening experiment show that reaction temperature, O2 concentration, and H2O (g) concentration are the significant factors. Then, a quadratic polynomial regression model between the significant factors and SO2 adsorption capacity was established using the central composite design (CCD). The model optimization results indicate that when reaction temperature is 904.74°C, O2 concentration is 4.67%,H2O concentration is 27.98%, the PAC (PAC-OP) prepared had a higher SO2 adsorption capacity of 68.15 mg/g while its SO2 adsorption capacity from a validation experiment is 68.82 mg/g, and the error with the optimal value is 0.98%. Compared to two typical commercial activated cokes (ACs), PAC-OP has relatively more developed pore structures, and its SBET and Vtot are 349 m2/g and 0.1475 cm3/g, significantly higher than the 186 m2/g and 0.1041 cm3/g of AC1, and the 132 m2/g and 0.0768 cm3/g of AC2. Besides, it also has abundant oxygen-containing functional groups, its surface O content being 12.09%, higher than the 10.42% of AC1 and 10.49% of AC2. Inevitably, the SO2 adsorption capacity of PAC-OP is also significantly higher than that of both AC1 and AC2, which is 68.82 mg/g versus 32.53 mg/g and 24.79 mg/g, respectively.

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Acknowledgements

This work was financial supported by the National Key R&D Program of China (Grant No. 2017YFB0602902).

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Authors and Affiliations

  1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of the Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, 250061, China

    Binxuan Zhou, Tao Wang, Tianming Xu, Cheng Li, Yuan Zhao, Jiapeng Fu, Zhanlong Song & Chunyuan Ma

  2. School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China

    Zhen Zhang

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  1. Binxuan Zhou
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  2. Tao Wang
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  3. Tianming Xu
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  4. Cheng Li
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  5. Yuan Zhao
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  6. Jiapeng Fu
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  7. Zhen Zhang
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  8. Zhanlong Song
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  9. Chunyuan Ma
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Correspondence to Tao Wang or Chunyuan Ma.

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11708_2020_719_MOESM1_ESM.pdf

Optimizing the process parameters for preparation of powdered activated coke (PAC) to achieve maximum SO2 adsorption capacity using response surface methodology (RSM)

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Zhou, B., Wang, T., Xu, T. et al. Optimization of process parameters for preparation of powdered activated coke to achieve maximum SO2 adsorption using response surface methodology. Front. Energy 15, 159–169 (2021). https://doi.org/10.1007/s11708-020-0719-7

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  • DOI: https://doi.org/10.1007/s11708-020-0719-7

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