State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, PR China.
China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, PR China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, PR China.
Bioresour Technol. 2019 Oct;289:121729. doi: 10.1016/j.biortech.2019.121729. Epub 2019 Jun 29.
The micropores present in ZSM-5 are beneficial to the production of aromatic compounds in biomass catalytic pyrolysis, although the small pore size leads to severe coke deposition on the catalyst. In this study, a micro-mesoporous structured ZSM-5 zeolite catalyst was synthesized and modified with green templates (sucrose, cellulose, and starch) to introduce additional mesopores. It was found that the catalysts modified using the sucrose and cellulose templates only exhibited a slight increase in their micropore volumes, while the mesopore volume of ZSM-ST (modified with the starch template) reached up to 0.359 cm/g. This increase promoted the cracking of bulky oxygenates and suppressed the polymerization reaction on the ZSM-5 surface, thereby producing a greater number of aromatic products. Moreover, the benzene, toluene, and xylene (BTX) yields exhibited a positive correlation with the catalyst mesopore volume, with the highest BTX yield of 91.84 mg/g being obtained with 10% starch addition.
ZSM-5 中的微孔有利于生物质催化热解中芳香族化合物的生成，尽管孔径小会导致催化剂上严重的积碳。在这项研究中，合成了一种具有微孔-介孔结构的 ZSM-5 沸石催化剂，并使用绿色模板（蔗糖、纤维素和淀粉）对其进行修饰以引入额外的介孔。结果表明，仅使用蔗糖和纤维素模板修饰的催化剂的微孔体积略有增加，而用淀粉模板修饰的 ZSM-ST 的介孔体积则高达 0.359cm³/g。这种增加促进了大分子含氧物的裂化，并抑制了 ZSM-5 表面的聚合反应，从而产生了更多的芳香族产物。此外，苯、甲苯和二甲苯（BTX）的收率与催化剂介孔体积呈正相关，添加 10%淀粉时 BTX 的最高收率为 91.84mg/g。
