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Chemistry and Industry of Forest Products ›› 2015, Vol. 35 ›› Issue (1): 70-76.doi: 10.3969/j.issn.0253-2417.2015.01.011

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Comparison of the Products in Vacuum Pyrolysis Vapors Derived from Non-catalytic and Catalytic Upgrading of Camphorwood Sawdust

FAN Yong-sheng, CAI Yi-xi, LI Xiao-hua, YU Ning, CHEN Lei   

  1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2014-05-12 Online:2015-02-25 Published:2015-03-05

Abstract: Direct catalysis of the vapors from biomass(camphorwood sawdust) vacuum pyrolysis was investigated over HZSM-5 zeolite in a two-stage fixed-bed reactor. Comparative analysis of the yield changes of each phase and the composition of the gas phase, as well as the physicochemical properties and chemical composition of bio-oil before and after catalysis was conducted. The results showed that the presence of catalyst decreased the bio-oil yield while bio-oil consisted of separable oil and aqueous phases. The H/C molar ratio, pH value and high heat value(HHV) of oil phase were 1.712, 4.93 and 37.15 MJ/kg, respectively. The use of HZSM-5 zeolite caused a remarkable increase of the target products including aromatic hydrocarbons, light phenols and alcohols, and a significant decrease of the unstable and corrosive compounds, such as carboxylic acids, aldehydes and ketones. The oil phase had higher qualities compared with raw bio-oil and could be used as an alternative fuel. The fuel added value of aqueous phase(dry basis) was also higher with HHV of 32.98 MJ/kg than that of raw bio-oil though it still contained a small amount of unstable and corrosive compounds. Transformation reactions of the non-target compounds on the HZSM-5 zeolite followed carbonium ions reaction mechanism.

Key words: biomass, vacuum pyrolysis, HZSM-5 catalysis, bio-oil

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