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Ex-situ catalytic fast pyrolysis of pine sawdust over two different catalysts

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

Citation:  2016 ASABE Annual International Meeting  162456386.(doi:10.13031/aim.20162456386)
Authors:   Shouyun Cheng, Lin Wei, James Julson
Keywords:   Biofuels, catalytic cracking, Co-Mo/HZSM-5, hydrocarbon, methane aromatization.

Abstract. Biomass is a renewable energy that can partly substitute fossil fuels. Biomass can be converted to bio-oil through pyrolysis, which is a potential transportation fuel. However, the bio-oil has to be upgraded due to its high oxygen content. In this study, Co-Mo/HZSM-5 and HZSM-5 catalysts were used to upgrade bio-oil vapor to produce hydrocarbon biofuel using a two stage reactor. The results showed that both Co-Mo/HZSM-5 and HZSM-5 catalysts reduced bio-oil yields compared to non-catalytic treatment. The HHV, water content, density, viscosity and pH of catalytic bio-oil were improved compared to non-catalytic bio-oil. Co-Mo/HZSM-5 and HZSM-5 catalysts increased the hydrocarbon content in upgraded bio-oil in comparison with non-catalytic bio-oil. The Co-Mo/HZSM-5 produced bio-oil with highest hydrocarbon contents at 13.96% due to the additional methane aromatization reactions over the catalyst. The catalysts also reduced the content of undesirable oxygenated compounds such as alcohols, esters, ethers and ketones in upgraded bio-oil in comparison with non-catalytic bio-oil. There was no significant difference in the properties of bio-char in catalytic and non-catalytic treatments due to the same pyrolysis conditions.

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