Effects of particle size, pretreatment, and catalysis on microwave pyrolysis of corn stover
2018
Huang, Yu-Fong | Kuan, Wen-Hui | Chang, Chun-Yuan
The effects of particle size, pretreatment (acid pretreatment and steam explosion), and catalysis of aluminum oxide (Al₂O₃) on heating efficiency, product distribution, and gaseous product composition of corn stover pyrolysis using microwave heating were investigated in this study. Both maximum temperature and heating rate increased with decreasing particle size of corn stover. The heating efficiency was also improved over Al₂O₃ and by applying both pretreatment methods. Adding 10-mesh Al₂O₃ increased the gaseous yield but decreased the liquid yield. However, this phenomenon did not exist when 50-mesh Al₂O₃ was used. This may be attributable to that small catalyst particles are encapsulated by other catalyst and biomass particles to reduce their catalytic activity. Applying acid pretreatment substantially decreased the gaseous yield but increased the liquid yield, whereas the effect of steam explosion was not significant. Approximately half of CO was produced during the first 5 min of experiment, but the yields of H₂, CH₄, and CO₂ produced from microwave pyrolysis of corn stover pretreated by acid were relatively small or even none during this initial period. The reaction kinetics for microwave pyrolysis of corn stover was analyzed by using the first- and second-order reaction models.
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