Upgrading of Bio-Oil in a Continuous Process with Dolomite Catalyst

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• 作者：Beatriz Valle ; Borja Aramburu ; Claudia Santiviago ; Javier Bilbao ; Ana G. Gayubo
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：28
• 期：10
• 页码：6419-6428
• 全文大小：442K
• ISSN：1520-5029

文摘

Catalytic upgrading was applied to the liquid product obtained from biomass fast pyrolysis (raw bio-oil) in a continuous reaction system by using dolomite as a low-cost catalyst. The upgrading reactor operates at atmospheric pressure without external H₂ supply and consists of a thermal treatment section, where pyrolytic lignin is deposited, and a catalytic upgrading section, where the thermally treated oil is valorized in-line. The reaction products, i.e., solid (pyrolytic lignin), gases, and upgraded oil, are collected separately after each reaction. The effect that temperature (400鈥?00 掳C) and time on stream (up to 4 h) have on the yield and composition of the products obtained was analyzed for a space-time of 2.4 g_dolomite h/g_feed. The dolomite effectively reduced the O/C ratio and removed the carboxylic acids and sugars (mainly levoglucosan) contained in the bio-oil. A gaseous product interesting as a fuel and as raw material for syngas production was obtained below 600 掳C, provided that dolomite is not saturated (efficient CO₂ capture). Thus, for reaction times of 鈮? h the concentration values in the 400鈥?00 掳C range are H₂ (5鈥?2%), CO (48鈥?8%), CO₂ (2.2鈥?.2%), and CH₄ (23鈥?1%). A good deoxygenation level (鈮?0%) was achieved after 0.5 h reaction at 600 掳C, yielding oil with the O/C ratio 鈮?0.25 and composed of acetone (22%), phenol (51%), and alkyl-substituted phenols (22%). Upgraded oil with low O/C ratio (鈮?.21) and high contents of phenol (86.4%) and alkyl-phenols (5.3%) was obtained after 4 h of reaction at 700 掳C. This oil has a promising potential for use in phenolic resins formulation and diesel fuel blending.