Toyoda Hiroto, Osuga Ryota, Wang Yong, Park Sungsik, Yazawa Koji, Gies Hermann, Gilbert Christopher J, Yilmaz Bilge, Kelkar C P, Yokoi Toshiyuki
Institute for Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
Phys Chem Chem Phys. 2022 Feb 16;24(7):4358-4365. doi: 10.1039/d2cp00215a.
MSE-type zeolites synthesized by different organic structure-directing agents (OSDAs), UZM-35 and MCM-68, were prepared. The location of Brønsted acid sites derived from the framework Al atoms and acidic properties were investigated based on Al MQMAS NMR and IR techniques combined with the evaluation of the catalytic activity. We have successfully found a significant difference in the location of Brønsted acid sites in the MSE-type framework; 61 and 33% of acid sites were located at the 12-ring channel for MCM-68 and UZM-35, respectively. The differences in the location of the acid sites yielded their unique catalytic activities for the hydrocarbon cracking reactions, indicating that a well-chosen type of OSDAs for the synthesis is one of the possibilities for controlling the distribution of the framework Al atoms in the MSE-type framework.
制备了由不同有机结构导向剂（OSDA）合成的MSE型沸石UZM - 35和MCM - 68。基于铝多量子魔角旋转核磁共振（Al MQMAS NMR）和红外（IR）技术并结合催化活性评估，研究了源自骨架铝原子的布朗斯台德酸位点的位置和酸性性质。我们成功地发现了MSE型骨架中布朗斯台德酸位点位置的显著差异；对于MCM - 68和UZM - 35，分别有61%和33%的酸位点位于12元环通道。酸位点位置的差异产生了它们对烃类裂化反应独特的催化活性，这表明为合成选择合适类型的有机结构导向剂是控制MSE型骨架中骨架铝原子分布的一种可能途径。
