Elemental loss, enrichment, transformation and life cycle assessment of torrefied corncob

Congyu Zhang, Wei Hsin Chen, Shih Hsin Ho

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Elemental loss, enrichment, and transformation are crucial to evaluate the fuel properties of torrefied biomass, and life cycle assessment (LCA) can reflect the environmental impact of torrefaction operation. The corncob is selected as the feedstock for the exploration of fuel properties variation during the torrefaction process. The obtained result implies that torrefaction operation obviously changes the macroscopic and microscopic morphologies of torrefied corncob, and leads to a higher calorific value and bigger surface area. With the increase of torrefaction temperature and torrefaction duration, the loss of weight percentage of elemental C, H, and O occurs and is in the order of O > C > H. The relative content of elemental C gradually increases and leads to better fuel properties. The forms of elemental N and O are stable and do not change during the torrefaction process, but the form of C gradually changes from a combined state to an elemental state. These results are confirmed by Fourier transform infrared (FT-IR) spectra, contact angle detection, and thermogravimetric and derivative thermogravimetric analysis. The LCA result infers that the light torrefaction process (200 °C) possesses the lowest environmental impact, whereas the mild torrefaction condition of 250 °C appears to be the optimal choice for corncob upgrading.

Original languageEnglish
Article number123019
Publication statusPublished - 2022 Mar 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Modelling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • Energy(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law
  • Electrical and Electronic Engineering


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