Tong Yan, Zhang Li, Ma Hong, Wang Yi, Liu Xiaolong
School of Materials, Sun Yat-sen University, Shenzhen 518107, China.
Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, China.
Materials (Basel). 2024 Jun 10;17(12):2824. doi: 10.3390/ma17122824.
It is crucial to identify the structures of active sites to understand how catalysts function and to use that understanding to develop better catalytic materials. ZSM-5 zeolites with dominant Al(IV)-2 sites have been developed in this work. H-Al 2D HMQC and 2D H TQ(DQ)-SQ NMR experiments have been performed to investigate the structural properties of this acidic site. The Al(IV)-2 sites have Brønsted and Lewis acid characteristics. The catalytic performance of Al(IV)-2 sites has been tested by n-dodecane cracking reactions. The catalytic results show that the Brønsted acidic strength of the Al(IV)-2 sites is comparable to that of the Al(IV)-1 sites, but the Al(IV)-2 sites' Lewis acid characteristics provide extra catalytic activity. We have gained valuable insights into the characteristics of Al(IV)-2 acid sites within these materials.
识别活性位点的结构对于理解催化剂的功能以及利用该理解来开发更好的催化材料至关重要。在这项工作中，已开发出具有主要Al(IV)-2位点的ZSM-5沸石。已进行了H-Al 2D HMQC和2D H TQ(DQ)-SQ NMR实验来研究该酸性位点的结构性质。Al(IV)-2位点具有布朗斯台德和路易斯酸特征。通过正十二烷裂解反应测试了Al(IV)-2位点的催化性能。催化结果表明，Al(IV)-2位点的布朗斯台德酸性强度与Al(IV)-1位点相当，但Al(IV)-2位点的路易斯酸特征提供了额外的催化活性。我们对这些材料中Al(IV)-2酸性位点的特征有了宝贵的见解。
