Preliminary Studies on the Electrochemical Conversion of Liquefied Forest Biomass

Reactions Pub Date : 2022-10-31 DOI:10.3390/reactions3040037
Tiago Silva, José Condeço, D. Santos
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引用次数: 1

Abstract

Bio-oils produced from three different biomass sources, namely cork, pinewood, and olive stones, are evaluated concerning their suitability and prospects of including their electrochemical transformations in a biorefinery scenario for the production of added-value compounds. Different types and concentrations of electrolytes (e.g., H2SO4, KOH) are added to the bio-oils to increase the samples’ initially low ionic conductivity. The samples prepared by mixing bio-oil with 2 M KOH aqueous solution (50 vol.%) lead to a stable and homogeneous bio-oil alkaline emulsion suitable for electrochemical studies. The bio-oil samples are characterized by physicochemical methods (e.g., density, viscosity, conductivity), followed by analyzing their electrochemical behavior by voltammetric and chronoamperometric studies. The organics electrooxidation and the hydrogen evolution reaction in the bio-oils are assessed using Pt electrodes. Single- and two-compartment cell laboratory bio-oil electrolyzers are assembled using nickel plate electrodes. Electrolysis is carried out at 2.5 V for 24 h. Attenuated Total Reflection-Fourier-Transform Infrared Spectroscopy and Mass Spectrometry are applied to identify possible changes in the bio-oil samples’ chemical structure during the electrolysis experiments. Comparing the analyses of the bio-oil samples subjected to electrolysis with the blank samples demonstrates that bulk electrolysis significantly changes the bio-oil composition. The bio-oil obtained from cork biomass shows the most promising results, but further studies are required to understand the nature of the actual changes.
液化森林生物质电化学转化的初步研究
从三种不同的生物质来源,即软木、松木和橄榄石生产的生物油,评估了它们的适用性和前景,包括它们在生物炼制方案中的电化学转化,以生产增值化合物。在生物油中加入不同类型和浓度的电解质(如H2SO4、KOH),以提高样品最初较低的离子电导率。将生物油与2 M KOH水溶液(50 vol.%)混合制备样品,得到稳定均匀的生物油碱性乳液,适合电化学研究。生物油样品通过物理化学方法(如密度、粘度、电导率)进行表征,然后通过伏安法和时安培法研究分析其电化学行为。采用Pt电极对生物油中的有机物电氧化和析氢反应进行了评价。单室和双室实验室生物油电解槽采用镍板电极组装。在2.5 V下电解24 h。利用衰减全反射-傅里叶变换红外光谱法和质谱法鉴定电解实验过程中生物油样品化学结构可能发生的变化。将电解生物油样品与空白样品的分析结果进行比较,表明本体电解显著改变了生物油的组成。从软木生物质中获得的生物油显示出最有希望的结果,但需要进一步的研究来了解实际变化的本质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
2.70
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