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Co-pyrolysis of biomass and plastics with biochar as catalyst for production of aliphatic hydrocarbons

Author

Listed:
  • Wang, Zhiwei
  • Guo, Shuaihua
  • Li, Zhuo
  • Chen, Zhuo
  • Wang, Qun
  • Chen, Gaofeng
  • Lei, Tingzhou
  • Yan, Xiaoyu

Abstract

This study investigated the fast co-pyrolysis of pine wood (PW) with waste plastics (PP and LDPE), employing biochar derived from PW gasification as a catalyst. By capitalizing on the synergistic interactions among the biomass, plastics and the catalytic function of the biochar, pyrolysis oil rich in aliphatic hydrocarbons (ACHs) were selectively produced. The results demonstrate complementarity and compatibility between PW and the plastics at the molecular functional group level, with PP providing a superior hydrocarbon pool compared to LDPE. The gasification biochar possesses a layered microporous structure, characterized by metallic active sites and acid sites on its surface. Its principal catalytic mechanisms involve the chain scission of C21+ ACHs and the deoxygenation of oxygen-containing compounds, supplemented by the adsorption of certain oxygen-containing macromolecules. Under biochar catalysis, the co-pyrolysis of PW and PP yielded an ACHs content of 65.16%, predominantly consisting of C5-C11 unsaturated chain aliphatic with methyl side chains and minor cyclic hydrocarbons. In contrast, co-pyrolysis with LDPE produced a slightly lower ACHs content of 62.99%, which was primarily composed of C12-C20 unsaturated straight-chain aliphatic. This study illuminates ACHs selective production across co-pyrolysis of biomass and waste plastics with biochar to enhance yield, thereby furnishing technologies relevant to the high value conversion and utilization of waste in the future.

Suggested Citation

  • Wang, Zhiwei & Guo, Shuaihua & Li, Zhuo & Chen, Zhuo & Wang, Qun & Chen, Gaofeng & Lei, Tingzhou & Yan, Xiaoyu, 2026. "Co-pyrolysis of biomass and plastics with biochar as catalyst for production of aliphatic hydrocarbons," Energy, Elsevier, vol. 351(C).
    • Handle: RePEc:eee:energy:v:351:y:2026:i:c:s036054422600976x
    DOI: 10.1016/j.energy.2026.140873
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