多级孔ZSM-5分子筛的合成及其催化裂解性能.

Hierarchical ZSM-5 (Z1) were synthesized via a simple hydrothermal activation-crystallization method using silica sol and sodium aluminate as raw materials without adding any organic ammonium template. Based on the above synthesis method, sucrose, lignin and microcrystalline cellulose were added as mesoporous template to produce three hierarchical ZSM-5 (SZ，LZ and CEZ) respectively・ Further catalytic co-cracking of cellulose and low density polyethylene (LDPE) was carried out to investigate the effect of reaction temperature, catalyst acidity and pore size on the distribution of cracked products・ The highest yield of BTX (benzene, toluene and xylene) (21.6%) was obtained at 550 °C over Z1 for cocracking of cellulose/LDPE at 450 ~600 °C. Co-cracking experiments were carried out under the optimized temperature of 550 °C using different catalysts・ The CEZ-10 obtained the highest yield of BTX (26.1%) and good coke・resistance・ Compared to separately cracking of LDPE，co-cracking yield a higher BTX increased by 8.3% over CEZ-10. The results indicate that catalytic co-cracking of cellulose and LDPE contributes to the generation of BTX. [ABSTRACT FROM AUTHOR]

在不添加任何有机胺模板剂情况下，以硅溶胶和铝酸钠为原料通过简单的水热活化-晶化法合成多级孔ZSM-5分子筛(Z1),在此合成方法上，分别添加蔗糖、木质素、微晶纤维素作为介孔模板剂，合成了三种多级孔ZSM-5分子筛(SZ、LZ、CEZ)。进一步对纤维素和低密度聚乙烯(LDPE)进行共催化裂解研究，考察裂解反应温度和催化剂酸性、孔径对产物分布的影响。结果表明，在450～600℃下使用Z1对纤维素/LDPE进行共裂解，550℃时得到的BTX(苯、甲苯、二甲苯)产率最高(21.6%)。在优化温度下(550℃),使用不同催化剂进行共裂解实验，使用CEZ-10得到的BTX产率最高(26.1%),并有良好的抗积碳能力。与单独裂解LDPE(17.8%)相比，CEZ-10共裂解得到的BTX产率提升了8.3%。结果表明，共催化裂解纤维素和LDPE有助于BTX的生成. [ABSTRACT FROM AUTHOR]