Catalytic Conversion of Bio-Oil to Oxygen-Containing Fuels by Acid-Catalyzed Reaction with Olefins and Alcohols over Silica Sulfuric Acid

Energies

Zhijun Zhang¹  Shujuan Sui¹  Fengqiang Wang¹  Qingwen Wang¹ 

[1] MOE Key Laboratory of Bio-based Material Science and Technology, Northeast Forestry University, Harbin 150040, China; E-Mails:

关键词: real bio-oil upgrading;    silica sulfuric acid;    oxygen-containing fuels;    olefin;    alcohol;   

DOI  :  10.3390/en6094531

来源: mdpi

【 摘 要 】

Crude bio-oil from pine chip fast pyrolysis was upgraded with olefins (1-octene, cyclohexene, 1,7-octadiene, and 2,4,4-trimethylpentene) plus 1-butanol (iso-butanol, t-butanol and ethanol) at 120 °C using a silica sulfuric acid (SSA) catalyst that possesses a good catalytic activity and stability. Gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (¹H-NMR) analysis showed that upgrading sharply increased ester content and decreased the amounts of levoglucosan, phenols, polyhydric alcohols and carboxylic acids. Upgrading lowered acidity (pH value rose from 2.5 to >3.5), removed the unpleasant odor and increased hydrocarbon solubility. Water content dramatically decreased from 37.2% to about 7.0% and the heating value increased from 12.6 MJ·kg⁻¹ to about 31.9 MJ·kg⁻¹. This work has proved that bio-oil upgrading with a primary olefin plus 1-butanol is a feasible route where all the original heating value of the bio-oil plus the added olefin and alcohol are present in the resulting fuel.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.