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Catalytic upgrading of Douglas fir sawdust pellet vapors over Zn/ZSM-5 catalysts in a packed-bed catalysis reactor

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131594800,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Lu Wang, Hanwu Lei, Quan Bu, Lei Zhu, Jing Liang, Yupeng Liu, John Lee, Shunlin Chen, Juming Tang
Keywords:   Catalytic cracking packed-bed catalysis microwave pyrolysis Douglas fir sawdust pellet Zn/ZSM-51. Introduction

Abstract. Catalytic cracking of biomass pyrolysis vapor through a packed-bed catalysis close coupled with microwave pyrolysis was investigated to convert Douglas fir sawdust pellets to aromatic hydrocarbons by Zn/ZSM-5 catalyst. Five different Zn loadings (0, 0.5%, 1%, 2%, 5%) were tested in this study. GC/MS analysis results showed that the highest amount of aromatic hydrocarbons detected when 0.5% Zn was loaded on ZSM5. Then a central composite experimental design (CCD) was used to optimize the upgraded bio-oil and syngas yields with 0.5% Zn loaded in ZSM5. The bio-oil yield decreased while gas yield increased after Zn/ZSM-5 catalysis, and the water content of bio-oils was higher than non-catalytic bio-oils. And the syngas was mainly composed of H2, CO, CO2, CH4, and C2H4. GC/MS analysis showed that aromatic hydrocarbons become the most abundant compounds in the bio-oil. The effects of temperature and (WHSV)-1 on the bio-oil composition were determined. It was found that the aromatic hydrocarbon was increased when the packed-bed temperature and (WHSV)-1 increased.

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