Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands.
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40151-40162. doi: 10.1021/acsami.9b15593. Epub 2019 Oct 18.
In this work, we developed a novel strategy to synthesize porous (alumino)silicate materials using a single structure-directing agent composed of an imidazole unit with a hydrophobic tail, namely, 1,2-dimethyl-3-hexadecyl-1H-imidazol-3-ium bromide (CdMImz). A wide range of products such as ordered mesoporous silicas, layered silica-alumina, and hierarchically porous mordenite zeolite were obtained by varying synthesis parameters such as temperature and aluminum concentration. By changing crystallization temperature, we could control the degree of silica condensation and tune the textural and morphological properties of the final materials. By varying the aluminum concentration in the gel, we can obtain mesoporous amorphous silica-alumina or crystalline mordenite zeolite with, respectively, weak and strong Brønsted acid sites. Obtained acidic silica-alumina materials displayed promising performance in catalytic reactions of linear paraffin hydroisomerization and Friedel-Crafts alkylation of benzene with benzyl alcohol.
在这项工作中，我们开发了一种使用由具有疏水性尾部的咪唑单元组成的单一结构导向剂（即 1,2-二甲基-3-十六烷基-1H-咪唑-3-溴化物（CdMImz））合成多孔（铝）硅酸盐材料的新策略。通过改变温度和铝浓度等合成参数，可以获得各种产品，如有序介孔硅、层状硅铝酸盐和分级多孔丝光沸石。通过改变结晶温度，可以控制二氧化硅的缩合程度，并调整最终材料的结构和形态特性。通过改变凝胶中的铝浓度，可以得到具有弱和强 Brønsted 酸位的介孔无定形硅铝酸盐或结晶丝光沸石。所得到的酸性硅铝酸盐材料在直链石蜡加氢异构化和苯与苄醇的 Friedel-Crafts 烷基化反应的催化反应中表现出良好的性能。
