The char yield appeared to increase with an increase in pyrolysis pressure. The yields of the lighter gas components (CO, CO2, H2, CH4, H2O) increased as the pressure was increased. The increase in the amount of char and lighter gases was accompanied by a decrease in the formation of tar species. This was supported by an observed decrease in furan and furfural and higher hydrocarbon fragments with increasing pressure. There were clear differences in the evolution of gaseous species between the woody and herbaceous and agricultural residue feedstocks. The evolution of char morphology is strongly influenced by pyrolysis pressure and heating rates. The results suggest a complex role of pyrolysis conditions and biomass ash content on the char reactivity.
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