一个由美国加州大学伯克利分校Alexis T. Bell带领的合作团队经过不懈努力，开发了由脱铝β沸石中≡SiOZn–OH巢穴里的孤立铂原子催化的丙烷脱氢反应。2021年12月9日出版的《美国化学会杂志》发表了这项成果。

研究团队报告了一种设计、合成和表征沸石支撑的丙烷脱氢催化剂的新策略，该催化剂将大部分孤立的Pt原子稳定地键合在脱铝β沸石纳米孔内的Zn原子巢中。该催化剂可以在长期使用中保持稳定，对丙烯具有较高的活性和选择性。由X射线吸收光谱增强的原子分辨率图像显示出巢内Pt大部分为原子级分散，研究人员还利用红外和核磁共振光谱做补充，确定了巢内Pt的结构模型。

据悉，原子分散的贵金属催化剂作为负载型金属团簇和金属纳米颗粒的替代材料，受到了研究人员的广泛关注。原子分散可以提供独特的化学特性，并最大限度地利用这些昂贵的金属。在双金属团簇中加入第二种金属被发现有助于减小Pt团簇的尺寸，然而，孤立的Pt原子在非贵金属原子小巢中的稳定性仍然具有挑战性。

附：英文原文

Title: Propane Dehydrogenation Catalyzed by Isolated Pt Atoms in ≡SiOZn–OH Nests in Dealuminated Zeolite Beta

Author: Liang Qi, Melike Babucci, Yanfei Zhang, Alicia Lund, Lingmei Liu, Jingwei Li, Yizhen Chen, Adam S. Hoffman, Simon R. Bare, Yu Han, Bruce C. Gates, Alexis T. Bell

Issue&Volume: December 9, 2021

Abstract: Atomically dispersed noble metal catalysts have drawn wide attention as candidates to replace supported metal clusters and metal nanoparticles. Atomic dispersion can offer unique chemical properties as well as maximum utilization of the expensive metals. Addition of a second metal has been found to help reduce the size of Pt ensembles in bimetallic clusters; however, the stabilization of isolated Pt atoms in small nests of nonprecious metal atoms remains challenging. We now report a novel strategy for the design, synthesis, and characterization of a zeolite-supported propane dehydrogenation catalyst that incorporates predominantly isolated Pt atoms stably bonded within nests of Zn atoms located within the nanoscale pores of dealuminated zeolite Beta. The catalyst is stable in long-term operation and exhibits high activity and high selectivity to propene. Atomic resolution images, bolstered by X-ray absorption spectra, demonstrate predominantly atomic dispersion of the Pt in the nests and, with complementary infrared and nuclear magnetic resonance spectra, determine a structural model of the nested Pt.

DOI: 10.1021/jacs.1c10261

Source: https://pubs.acs.org/doi/10.1021/jacs.1c10261