Characterization of bio-oils and bio-chars obtained from the catalytic pyrolysis of alkali lignin with metal chlorides
Characterization of bio-oils and bio-chars obtained from the catalytic pyrolysis of alkali lignin with metal chlorides
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DOI：
10.1016/j.fuproc.2015.06.048
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发表时间：
2015-10
影响因子：
7.5
通讯作者：
Wenliang Wang;Xueyong Ren;Jian-min Chang;L. Cai;S. Shi
中科院分区：
文献类型：
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作者：
Wenliang Wang;Xueyong Ren;Jian-min Chang;L. Cai;S. Shi
热解实验在固定床反应器中进行，反应温度为873 K，气体停留时间为1.0 s。研究了碱木质素热解过程中添加KCl、CaCl 2和FeCl 3对生物油和生物炭理化性质的影响。利用气相色谱-质谱联用仪（GC-MS）分析了生物油的组成。利用X射线衍射（XRD）、BET比表面积和扫描电镜（SEM）等技术对生物质焦进行了表征。KCl的加入导致生物油产率急剧下降，而生物炭产率增加。CaCl 2和FeCl 3的添加显著提高了生物油的产率和苯酚含量，同时抑制了残炭的形成。添加FeCl 3后生成的生物炭具有更高的BET比表面积。结果表明，在碱木质素中添加FeCl 3后，生物油和生物炭的质量都得到了显著提高，有利于生物油作为化工原料和生物炭作为活性炭种的利用。
The pyrolysis experiments were carried out in a fixed bed reactor at a reaction temperature of 873 K and gas residence time of 1.0 s. The physicochemical properties of bio-oils and bio-chars obtained from alkali lignin pyrolysis with and without KCl, CaCl2, and FeCl3additives were studied. The compositions of bio-oils were examined using gas chromatography–mass spectrometry (GC–MS). Characterizations of bio-chars were performed using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area and scanning electron microscopy (SEM) techniques. Adding KCl caused a sharp decrease in bio-oil yield while an increase in bio-char yield was found as a result. The addition of CaCl2and FeCl3significantly increased the yield of bio-oil and phenol content while inhibited the formation of char residues. The bio-char generated after FeCl3addition has a much high BET surface area. This result indicates that the addition of FeCl3in alkali lignin significantly improves the quality of both bio-oil and bio-char, which is beneficial to the usage of bio-oil for chemical materials and bio-char for activated carbon species.