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The production of hydroprocessed renewable diesel with a catalyst regenerated using supercritical carbon dioxide (SCCO2)

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  • Lee, Cheng-Pao
  • Wang, Wei-Cheng

Abstract

Hydroprocessed renewable diesel was produced using a hydro-treatment technology that is mainly dependent on the feedstock quality and catalyst performance. In this study, the regeneration of NiMo/γ-Al2O3 hydroprocessing catalyst was investigated with continuous and batch operations for the purpose of recovering waste catalyst and improving catalyst performance. Supercritical carbon dioxide and co-solvent were utilized to perform the regeneration process, and the process parameters were discussed. Furthermore, the regenerated catalyst was characterized using TGA, FTIR, BET, and XRD methods and compared to both fresh and spent catalysts. It was found that the optimal regeneration for catalyst could be obtained using a batch mode at the pressure of 76 bar and the temperature of 523 K with injecting 10 mL per period hexane co-solvent for 3 periods, resulting in 15.5% of mass removal rate. The regenerated catalyst possessed >97% conversion while the fresh one obtained >99%.

Suggested Citation

  • Lee, Cheng-Pao & Wang, Wei-Cheng, 2022. "The production of hydroprocessed renewable diesel with a catalyst regenerated using supercritical carbon dioxide (SCCO2)," Energy, Elsevier, vol. 246(C).
    • Handle: RePEc:eee:energy:v:246:y:2022:i:c:s036054422200305x
    DOI: 10.1016/j.energy.2022.123402
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    References listed on IDEAS

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    1. Hsu, Keng-Hao & Wang, Wei-Cheng & Liu, Yu-Cheng, 2018. "Experimental studies and techno-economic analysis of hydro-processed renewable diesel production in Taiwan," Energy, Elsevier, vol. 164(C), pages 99-111.
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