Characteristics of in-situ reforming of the products from fast pyrolysis of ligno-cellulosic biomass to aromatic compounds over zeolite catalysts

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。利用两级管式反应器，在550 oC的温度下，在不同的沸石催化剂上，对生物质、合成纤维素、木聚糖和木质素的挥发性产物进行了转化。HZSM-5催化剂对生物质的催化转化性能最好，选择性为26%（以原料碳计）。HZSM-5对纤维素具有显著的效果，表明纤维素中超过30%的碳被转化为芳烃。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得到了实验证实。

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 biomass as well as synthetic cellulose, xylan, and lignin were converted using a two-stage tubular reactor at 550 oC over various zeolite catalysts. HZSM-5 exhibited a best performance in converting the biomass into aromatic hydrocarbons with the selectivity of 26% on feedstock carbon basis. The HZSM-5 had a significant effect for cellulose, showing that more than 30% of carbon in cellulose was converted into aromatic hydrocarbons. 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.