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

作者：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 · 发表于：Journal of the American Chemical Society · 年份：2021 · DOI：10.1021/jacs.1c10261 · 被引用次数：269 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Zeolite Catalysis and Synthesis

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.