Production of phenols from lignin-derived slurry liquid using iron oxide catalyst
Production of phenols from lignin-derived slurry liquid using iron oxide catalyst
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DOI：
10.1016/j.apcatb.2013.03.010
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发表时间：
2014-03
影响因子：
22.1
通讯作者：
T. Yoshikawa;S. Shinohara;T. Yagi;Naonori Ryumon;Y. Nakasaka;T. Tago;T. Masuda
中科院分区：
文献类型：
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作者：
T. Yoshikawa;S. Shinohara;T. Yagi;Naonori Ryumon;Y. Nakasaka;T. Tago;T. Masuda
以木质素为原料，采用无氢催化裂解和解聚两步法制取酚类化合物。在第一步中，使用二氧化硅-氧化铝催化剂在水/1-丁醇溶液中在623 K下解聚木质素2 h。反应后，以67 C-mol%的产率获得木质素衍生的浆液。从模型研究中可以看出，木质素的解聚主要是通过木质素单元间的芳醚键水解实现的。对于第二步，使用高压固定床流动反应器在673 K下在氧化铁催化剂上进行浆料液体的1-丁醇相的催化反应。在高压水蒸气条件下的催化反应对于抑制固体产物的形成是有效的。此外，苯酚的回收率随F H2O/F值（蒸汽与浆液的流量比）的增加而增加，当F H2O/F= 5时，反应2-4 h，苯酚的回收率为17%。从模型研究和我们以前的结果，儿茶酚和甲氧基苯酚在浆料液体被认为是转化为苯酚，甲酚和其他烷基酚的氧化铁催化剂。
A two-step process consisting of depolymerization and catalytic cracking without hydrogen addition was carried out to produce phenols from lignin. In the first step, lignin was depolymerized using a silica-alumina catalyst in a water/1-butanol solution at 623 K for 2 h. After the reaction, lignin-derived slurry liquid was obtained in 67 C-mol% yield. From the model studies, it was considered that lignin was mainly depolymerized via hydrolysis of aryl ether bonds between lignin units. For the second step, the catalytic reaction of the 1-butanol phase of the slurry liquid was carried out over an iron oxide catalyst using a high pressure fixed-bed flow reactor at 673 K. The catalytic reaction under high pressure steam conditions was effective for the suppression of the formation of solid products. In addition, the recovery fraction of phenols increased as the F H 2 O/F value (the flow rate ratio of steam to the slurry liquid) increased, resulting in 17% of phenols at F H 2 O/F= 5 for 2–4 h. From the model studies and our previous results, catechol and methoxyphenol in the slurry liquid were considered to be converted into phenols, cresols and other alkyl phenols over the iron oxide catalyst.