Abstract
The cracks in nano‐order are generated and propagated when the combined water is released during the dehydration. If the nanopore can be utilized for a reaction site, the overall reaction can be extremely accelerated. On the other hand, it is well known that woody biomass is an attractive alternative fuel for the reduction of CO2 emission. However, the process of biomass pyrolysis is disturbed by the tar which causes a clogging in gas tubing system. Hata et al. found that the tar was consumed almost 100% in the iron ore layer having nanocrack or nanopore. The nanocracks formed in hematite crystals after dehydration of goethite were about 4 nm in width, which is in excellent agreement with the result of BET measurement. When the carbon deposited from tar into the nanocracks, reduction reactions were occurred simultaneously. The deposited carbons completely infilled into the nanocracks and the void in the sample.
Highlights
It is well known that a woody biomass is an attractive alternative fuel for the reduction of CO2 emission
When carbon deposition occurred in an iron ore, reduction reaction will occur, more or less, simultaneously
A goethite was dehydrated and a carbon deposition from tar occurred in a nanocracks of hematite
Summary
It is well known that a woody biomass is an attractive alternative fuel for the reduction of CO2 emission. To use biomass effectively, the technology development of biomass pyrolysis at low temperature without tar generation is strongly required Under these circumstances, Hata et al [1] reported the unique process named “Biotar ironmaking”, which consisted of the formation of nanocrack or nanopore through the dehydration of goethite, and at the same time, the deposition of carbon into the crack (pore) from tar generated by the pyrolysis of wood biomass. Hata et al [1] reported the unique process named “Biotar ironmaking”, which consisted of the formation of nanocrack or nanopore through the dehydration of goethite, and at the same time, the deposition of carbon into the crack (pore) from tar generated by the pyrolysis of wood biomass They found that the reduction of iron oxide occurred simultaneously during carbon deposition from tar. A possible mechanism of carbon deposition from tar in the crack or pore together with the reduction of iron ore was presented
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