Conversion of lignocellulosic biomass to green fuel oil over sodium based catalysts

被引:78
作者
Nguyen, T. S. [1 ]
Zabeti, M. [1 ]
Lefferts, L. [1 ]
Brem, G. [2 ]
Seshan, K. [1 ]
机构
[1] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[2] Univ Twente, Fac Sci & Technol, Lab Thermal Engn, NL-7500 AE Enschede, Netherlands
关键词
Renewable; Pyrolysis; Bio-oil; De-oxygenation; Acidity; FAST PYROLYSIS; GAMMA-ALUMINA; PHASE; TRANSITION; ADSORPTION; FRACTIONS; NA-23;
D O I
10.1016/j.biortech.2013.05.023
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Upgrading of biomass pyrolysis vapors over 20 wt.% Na2CO3/gamma-Al2O3 catalyst was studied in a lab-scale fix-bed reactor at 500 degrees C. Characterization of the catalyst using SEM and XRD has shown that sodium carbonate is well-dispersed on the support gamma-Al2O3. TGA and Na-23 MAS NMR suggested the formation of new hydrated sodium phase, which is likely responsible for the high activity of the catalyst. Catalytic oil has much lower oxygen content (12.3 wt.%) compared to non-catalytic oil (42.1 wt.%). This comes together with a tremendous increase in the energy density (37 compared to 19 MJ kg(-1)). Decarboxylation of carboxylic acids was favoured on the catalyst, resulting to an oil almost neutral (TAN = 3.8 mg KOH/g oil and pH = 6.5). However, the mentioned decarboxylation resulted in the formation of carbonyls, which correlates to low stability of the oil. Catalytic pyrolysis results in a bio-oil which resembles a fossil fuel oil in its properties. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:353 / 360
页数:8
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