华东师范大学徐浩团队报道了约束在Sn-ECNU-46分子筛中铂的高效烷烃脱氢。相关研究成果于2024年2月20日发表在《结构化学》。

高度分散和稳定的Pt基催化剂在构建高效的烷烃脱氢催化体系中起着至关重要的作用。

该研究中，通过后处理制备了一种新型的双金属Pt-Sn催化剂，该催化剂被限制在超大孔径ECNU-46沸石（表示为Pt/Sn-ECNU-46）中。开放位点的框架Sn物种（（SiO）3Sn-OH）作为锚与Pt物种相互作用，有利于Pt的高分散性。另一方面，骨架Sn作为第二金属调节Pt物种的几何和电子环境，从而抑制其积累。Pt/Sn-ECNU-46在丙烷脱氢反应中获得了良好的性能，具有较高的丙烷初始转化率（46%）、丙烯选择性（>99%）和再生能力。

此外，Pt/Sn-ECNU-46对正己烷的脱氢反应也有一定的活性。

该研究探讨了超大孔径沸石作为载体在构建金属约束烷烃脱氢催化剂中的应用。

附：英文原文

Title: Pt confined in Sn-ECNU-46 zeolite for efficient alkane dehydrogenation

Author: Naihong Wang, Longkang Zhang, Yejun Guan, Peng Wu, Hao Xu

Issue&Volume: 2024-02-20

Abstract: Highly dispersed and stable Pt-based catalysts play a crucial role in constructing efficient catalytic systems for alkane dehydrogenation. In this study, a novel bimetallic Pt-Sn catalyst confined in extra-large-pore ECNU-46 zeolite (denoted as Pt/Sn-ECNU-46) was prepared by post-treatment. The open-site framework Sn species ((SiO)3Sn-OH) served as anchors to interact with Pt species, favoring the high dispersion of Pt. On the other hand, the framework Sn species acted as the second metal to regulate the geometrical and electronic environment of Pt species, thus suppressing their accumulation. Pt/Sn-ECNU-46 achieved a good performance in propane dehydrogenation reaction with high initial propane conversion (46%) and propylene selectivity (> 99%) as well as regeneration ability. In addition, Pt/Sn-ECNU-46 was also active in the dehydrogenation of n-hexane. This study explored the application of extra-large-pore zeolite as support in constructing metal-confined catalysts for alkane dehydrogenation.

DOI: 10.1016/j.cjsc.2024.100248

Source: http://cjsc.ac.cn/cms/issues/572