生物油低温加氢脱氧的研究

采用Pt系负载型催化剂,在高压反应釜内进行了生物质快速裂解油(生物油)的低温加氢脱氧研究。考察了催化剂的种类(Pt/C和Pt/γ-Al_2O_3)、反应温度(180～240℃)和反应时间(20～80 min)对生物油加氢脱氧效果及产物收率的影响。实验结果表明,采用Pt/γ-Al_2O_3催化剂,在优化的反应条件(即反应温度220℃、反应时间60 min)下,生物油的脱氧率可达50%以上。产物分析结果表明,由于氧的脱除,提质油热值增加到33.45 MJ/kg,而羧基的转化使其pH提高到3.25;且产物实现了油水分离。该方法的特点是焦炭收率低(低于2%),因此催化剂的寿命长。

Hydrodeoxygenation of Bio-Oil Under Mild Conditions

To improve the stability of the bio-oil obtained by fast pyrolysis of biomass, hydrodeoxygenation of the bio-oil on supported Pt catalysts was carried out in an autoclave under mild conditions.The effects of catalyst type（Pt/C and Pt/γ-Al₂O₃）,reaction temperature（180-240℃） and reaction time（20-80 min） on the hydrodeoxygenation and product yields were investigated.The results showed that under the optimal conditions of Pt/γ-Al₂O₃ as catalyst,reaction temperature 220℃and reaction time 60 min,the oxygen content in the bio-oil could be decreased by about 50%.The analysis results indicated that the contents of the unstable oxygen compounds such as acid,aldehyde and ketone in the bio-oil were decreased.The heat value and the pH of the upgraded bio-oil were heightened to 33.45 MJ/kg and 3.25.The tar yield was lower than 2%,so the catalyst life was long.