In-situ reforming of the volatiles from fast pyrolysis of ligno-cellulosic biomass over zeolite catalysts for aromatic compound production
In-situ reforming of the volatiles from fast pyrolysis of ligno-cellulosic biomass over zeolite catalysts for aromatic compound production
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DOI：
10.1016/j.fuproc.2014.10.002
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发表时间：
2015-08
影响因子：
7.5
通讯作者：
K. Uemura;S. Appari;Shinji Kudo;J. Hayashi;H. Einaga;K. Norinaga
中科院分区：
文献类型：
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作者：
K. Uemura;S. Appari;Shinji Kudo;J. Hayashi;H. Einaga;K. Norinaga
采用自行设计的分析热解技术，研究了生物质快速热解产物的原位催化重整特性。衍生自木质纤维素生物质以及纤维素、木聚糖和木质素的挥发性产物使用两级管式反应器在550 °C下在具有不同酸度和孔结构的各种沸石催化剂上转化。HZSM-5催化剂对雪松挥发物的选择性最好，选择性为26%（碳基），芳烃主要由苯、甲苯和萘组成。HZSM-5对木聚糖和木质素的芳烃产率影响不大，而对纤维素的芳烃产率影响较大，纤维素中30%以上的碳转化为芳烃。挥发物重整反应的反应路径分析表明，炔和二烯如乙炔、丙炔和环戊二烯是主要芳烃产品如苯、甲苯和萘的重要前体。这些中间体的形成也被实验证实在原位重整的早期阶段。
Characteristics of in-situ catalytic reforming of the products derived from fast pyrolysis of biomass were studied with an originally designed analytical pyrolysis technique. The volatile products derived from ligno-cellulosic biomass as well as cellulose, xylan, and lignin were converted using a two-stage tubular reactor at 550 °C over various zeolite catalysts with different acidities and pore structures. HZSM-5 exhibited the best performance for converting the cedar derived volatiles to arenes, which mainly composed of benzene, toluene, and naphthalene with a selectivity of 26% on carbon basis. The HZSM-5 had a little effect in increasing the yields of the arenes for xylan and lignin, while it had a significant effect for cellulose, showing that more than 30% of carbon in cellulose was converted into arenes. A reaction pathway analysis for reforming of volatiles suggested that alkyne and diene such as acetylene, propyne, and cyclopentadiene are the important precursors of the major aromatic hydrocarbon products such as benzene, toluene, and naphthalene. The formations of those intermediates were also confirmed experimentally in an early stage of the in-situ reforming.