부산대학교 도서관

The roles of porosity, surface area, and catalyst acidity influenced pyrolysis product distribution. This research aims to improve the yield of pyrolysis oil produced through the pyrolysis of palm fronds with the assistance of beta zeolite (BEA) catalysts compared to those without catalysts. The effects of temperature during thermal pyrolysis, the SiO2/Al2O3 ratio of the BEA zeolite extrudate, and catalyst-to-feed (C/F) ratio during in situ catalytic cracking of palm fronds on the product distribution have been studied using a fixed-bed reactor by which the catalyst bed was put on top of the biomass bed. Thermal pyrolysis of palm fronds at 500 °C produced a higher yield of pyrolysis oil dominated by oxygenated aromatic compounds, whereas in-situ catalytic pyrolysis at a C/F ratio of 0.31 g/g and temperature of 500 °C increased the pyrolysis oil yield from 64.8% to 68.6% and 68.1%, respectively. The BEA-1 and BEA-2 increased the hemicellulose decomposition process by producing pyran and increasing cyclic ketone, acid, and gas yield. The catalytic cracking of the vapor of pyrolysis oil over BEA-1 was more active than BEA-2 because of higher acidity and deposited carbon on the catalyst. Therefore, using more acidic zeolite extrudate could improve pyrolysis oil yield. [ABSTRACT FROM AUTHOR]