Lee Jin Sil, Kim Sang Yun, Kim Tae-Wan, Jeong Soon-Young, Kim Chul-Ung, Lee Kwan-Young
J Nanosci Nanotechnol. 2017 Apr;17(4):2695-699. doi: 10.1166/jnn.2017.13340.
Mesoporous SiO₂–Al₂O₃ (SA) catalysts with different SiO₂ contents were prepared, for the selective production of p-xylene from dimethylfuran/ethylene through the combination of cycloaddition and dehydrative aromatization reactions, by a co-precipitation method. For comparison, commercial SiO₂–Al₂O₃ and ZSM-5 zeolites (Si/Al₂ = 30, Si/Al₂ = 80) were also employed as catalysts in the same reaction. The pore size of the catalysts played an important role in determining the catalytic performance in the production of p-xylene. Among the catalysts tested, the order of the yield and production rate of p-xylene was as follows: mesoporous SA > commercial SiO₂–Al₂O₃ > commercial ZSM-5. In the mesoporous SA catalysts in particular, p-xylene yields showed a volcano-shaped trend with respect to the catalyst’s SiO₂ content. The SA-60 catalyst, with SiO₂ = 52.3, showed the highest yield (75%) and production rate (57.7 mmol/g-cat · h) because of a catalyst structure with moderate pore size, which prevented side reactions.
采用共沉淀法制备了具有不同SiO₂含量的介孔SiO₂–Al₂O₃（SA）催化剂，用于通过环加成和脱水芳构化反应的组合从二甲基呋喃/乙烯选择性生产对二甲苯。作为对比，还采用了市售的SiO₂–Al₂O₃和ZSM-5沸石（Si/Al₂ = 30，Si/Al₂ = 80）作为同一反应中的催化剂。催化剂的孔径在决定对二甲苯生产中的催化性能方面起着重要作用。在所测试的催化剂中，对二甲苯的产率和生成速率顺序如下：介孔SA＞市售SiO₂–Al₂O₃＞市售ZSM-5。特别是在介孔SA催化剂中，对二甲苯产率相对于催化剂的SiO₂含量呈现出火山形趋势。SiO₂ = 52.3的SA-60催化剂由于具有适度孔径的催化剂结构，防止了副反应，因而显示出最高产率（75%）和生成速率（57.7 mmol/g-cat·h）。
