Hydrothermal Carbonization of Lignin with Vanillin as a Model Component
Hydrothermal Carbonization of Lignin with Vanillin as a Model Component
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DOI：
10.1002/ceat.201600090
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发表时间：
2017-06
影响因子：
2.1
通讯作者：
J. H. Curtze-;F. Bär;Jörg Steffan;Timo B. Dörr;H. Vogel
中科院分区：
文献类型：
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作者：
J. H. Curtze-;F. Bär;Jörg Steffan;Timo B. Dörr;H. Vogel
水热碳化是将湿生物质的能量集中在所谓的水热炭中的一种可能性。为了以合理的方式设计技术HTC反应器，应该知道生物质的四个主要组分-碳水化合物、木质素、脂肪/油和蛋白质的反应动力学。在以前的工作中，发表了纤维素的HTC [1]。此外，水热炭的变化动力学起着重要作用。木质素是一种高度复杂的大分子，本文研究的重点是木质素。因此，其构建单元之一甚至木质素HTC的中间体-香草醛-被用作模型组分[2]。为了确定水热炭官能化的动力学，首先必须开发有意义的分析方法。本文采用漫反射红外光谱（DRIFTS）对香草醛水热碳化得到的水热炭进行了研究。为了将DRIFT光谱中的IR带分配给不同的官能团，进行了温度梯度解吸实验（TPD）。然后进行DRIFTS和TPD的组合。该TPD/DRIFTS组合的结果被用作研究在HTC期间水热炭官能化的动力学的分析方法。
The Hydrothermal Carbonization is one possibility to concentrate energy of wet biomass in so called hydrochar. To design technical HTC-reactors in a rational way, the reaction kinetics of the four main components of biomass – Carbohydrates, lignin, fats/oils and proteins – should be known. In a previous work, the HTC of cellulose was published [1]. Furthermore, the kinetic of change of the hydrochar plays an important role. The focus of this paper is on lignin which is a highly complex macromolecule. Therefore, one of its building units and even intermediate of the HTC of lignin– vanillin – is used as a model component [2]. To determine the kinetics of hydrochar functionalization, initially a meaningful analytical method must be developed. In the presented experiments, the hydrochar obtained by hydrothermal carbonization of vanillin is investigated by Diffuse Reflectance Infrared Fourier Transformed Spectroscopy (DRIFTS). To assign the IR-bands in the DRIFT-spectra to different functional groups, Temperature Programed Desorption-experiments (TPD) were conducted. Afterwards a combination of DRIFTS and TPD was performed. The result of this TPD/DRIFTS-combination is used as an analytical method to investigate kinetics of hydrochar functionalization during the HTC.