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<p>This study proposes co-hydrothermal carbonization (co-HTC) of biomass with PVC to simultaneously upgrade fuel quality and improve subsequent CO<sub>2</sub> gasification performance while enabling dechlorination. Sawdust and rice straw were converted into hydrochars (SHC, RHC) and biomass-PVC co-hydrochars (SPC, RPC). Thermogravimetric analysis and fixed-bed gasification experiments under a CO<sub>2</sub> atmosphere were conducted, and FT-IR was used to examine functional-group evolution. Conventional HTC improved solid fuel properties but reduced gasification reactivity due to increased carbonization and structural densification. In contrast, substantial dechlorination was observed in the biomass/PVC co-HTC system (88–92%) and generated co-hydrochars with higher reactivity than biomass-derived hydrochars, evidenced by a lowered tar cracking temperature and enhanced gasification behavior at high temperatures. CO was the dominant gas component under all conditions, and the product-gas lower heating value from co-hydrochar gasification exceeded that from raw biomass at 900&#xa0;°C. Co-HTC provides a “waste-treating-waste” pathway to valorize PVC while producing superior biomass-derived gasification feedstocks for efficient energy recovery.</p> Graphical Abstract <p></p>

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Interaction Effects of Co-hydrothermal Carbonization of Biomass and PVC on CO₂ Gasification Performance

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Sijia Yuan,
  • Litao Geng,
  • Peitao Zhao,
  • Yan Ding,
  • Haiyun Zhou,
  • Wu Zuo,
  • Chao Feng

摘要

This study proposes co-hydrothermal carbonization (co-HTC) of biomass with PVC to simultaneously upgrade fuel quality and improve subsequent CO2 gasification performance while enabling dechlorination. Sawdust and rice straw were converted into hydrochars (SHC, RHC) and biomass-PVC co-hydrochars (SPC, RPC). Thermogravimetric analysis and fixed-bed gasification experiments under a CO2 atmosphere were conducted, and FT-IR was used to examine functional-group evolution. Conventional HTC improved solid fuel properties but reduced gasification reactivity due to increased carbonization and structural densification. In contrast, substantial dechlorination was observed in the biomass/PVC co-HTC system (88–92%) and generated co-hydrochars with higher reactivity than biomass-derived hydrochars, evidenced by a lowered tar cracking temperature and enhanced gasification behavior at high temperatures. CO was the dominant gas component under all conditions, and the product-gas lower heating value from co-hydrochar gasification exceeded that from raw biomass at 900 °C. Co-HTC provides a “waste-treating-waste” pathway to valorize PVC while producing superior biomass-derived gasification feedstocks for efficient energy recovery.

Graphical Abstract