Journal
FRONTIERS IN CHEMISTRY
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2020.00003
Keywords
biomass; microwave-assisted pyrolysis; reforming; activated carbon; hydrogen; syngas
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Funding
- National Natural Science Foundation of China [51606106]
- Ningbo Municipal Science and Technology Programme [2018B10023, 2017A610233]
- Zhejiang Provincial Department of Science and Technology under its Provincial Key Laboratory Programme [2020E10018]
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This study focuses on the use of a microwave reactor that combines biomass pyrolysis, at mild temperature, with catalytic reforming of the pyrolytic gas, using activated carbon, for generating hydrogen-rich synthesis gas. The traditional pyrolysis of biomass coupled with the reforming of its pyrolytic yields were also conducted using an electrically heated reactor. The bio-oil attained from conventional pyrolysis was higher in comparison to the yield from microwave pyrolysis. The reforming of the pyrolytic gas fraction led to reductions in bio-oil yield to <3.0 wt%, with a simultaneous increase in gaseous yields. An increase in the syngas and H-2 selectivity was discovered with the reforming process such that the use of microwave pyrolysis with activated carbon reforming produced 85 vol% synthesis gas fraction containing 55 vol% H-2 in comparison to the 74 vol% syngas fraction with 30 vol% H-2 obtained without the reforming. Cracking reactions were improved with microwave heating, while deoxidation and dehydrogenation reactions were enhanced by activated carbon, which creates a reduction environment. Consequently, these reactions generated H-2-rich syngas formation. The approach implemented in this study revealed higher H-2, syngas yield and that the overall LHV of products has huge potential in the transformation of biomass into high-value synthesis gas.
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