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Biomass Source Influence on Hydrogen Production through Pyrolysis and in Line Oxidative Steam Reforming.

Irati Garcia1, Gartzen Lopez1,2, Laura Santamaria1

  • 1Department of Chemical Engineering, University of the Basque Country UPV/EHU, P.O. Box 644, E48080, Bilbao, Spain.

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Summary

Pine wood yields the most hydrogen (9.3 wt%) through pyrolysis and oxidative steam reforming. Biomass composition significantly impacts hydrogen production efficiency, with rice husk and orange peel showing lower yields due to ash and carbon content.

Keywords:
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Area of Science:

  • * Chemical Engineering
  • * Renewable Energy
  • * Biomass Valorization

Background:

  • * Pyrolysis and oxidative steam reforming (OSR) are key thermochemical conversion processes for biomass.
  • * Understanding the influence of biomass composition on OSR efficiency is crucial for optimizing hydrogen production.

Purpose of the Study:

  • * To evaluate the hydrogen production potential of various biomass feedstocks via pyrolysis and OSR.
  • * To investigate the impact of biomass type and composition on the yield and efficiency of hydrogen generation.

Main Methods:

  • * Fast pyrolysis of biomasses conducted in a conical spouted bed reactor (CSBR) at 500°C.
  • * Oxidative steam reforming (OSR) of pyrolysis volatiles (gases and bio-oil) in a fluidized bed reactor (FBR) at 600°C.
  • * Utilization of a Ni/Al2O3 catalyst with specific steam/biomass ratios and catalyst space times.

Main Results:

  • * Pine wood demonstrated the highest hydrogen (H2) production at 9.3 wt%.
  • * Rice husk (7.7 wt%) and orange peel (5.5 wt%) yielded less H2 due to high ash and fixed carbon content, respectively.
  • * Microalgae exhibited poor performance due to lower conversion of its pyrolysis volatiles in the reforming stage.

Conclusions:

  • * Biomass feedstock selection significantly influences hydrogen production efficiency through pyrolysis and OSR.
  • * Ash and fixed carbon content in biomass negatively impact the conversion efficiency to bio-oil and subsequently hydrogen.
  • * Further research is needed to optimize OSR for diverse biomass pyrolysis volatile compositions, particularly for microalgae.