Pyrolysis may be a first step in biomass to biofuels conversion processes. The present study investigated 35
the influence of pressure on the thermal effects associated to biomass pyrolysis. Four energy crops were 36
selected for experimental characterization: corn stalks, poplar, switchgrass Alamo and switchgrass Trail- 37
blazer. The heat demand of the pyrolysis process was measured by differential scanning calorimetry at 38
pressures ranging from 0.1 to 4 MPa, using a specifically developed experimental configuration. An 39
increase of the operating pressure resulted in a lower heat demand and in an increase in the final char 40
yield. The results obtained suggest the presence of a competitive mechanism between the endothermic 41
reactions of the primary decomposition process, leading to the formation of volatiles, and the exothermic 42
vapor–solid interactions, leading to secondary char formation.
Pyrolysis may be a first step in biomass to biofuels conversion processes. The present study investigated 35
the influence of pressure on the thermal effects associated to biomass pyrolysis. Four energy crops were 36
selected for experimental characterization: corn stalks, poplar, switchgrass Alamo and switchgrass Trail- 37
blazer. The heat demand of the pyrolysis process was measured by differential scanning calorimetry at 38
pressures ranging from 0.1 to 4 MPa, using a specifically developed experimental configuration. An 39
increase of the operating pressure resulted in a lower heat demand and in an increase in the final char 40
yield. The results obtained suggest the presence of a competitive mechanism between the endothermic 41
reactions of the primary decomposition process, leading to the formation of volatiles, and the exothermic 42
vapor–solid interactions, leading to secondary char formation.
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