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المؤلفون: Jiameng Wang, Xingye Chen, Meng Ge, Yatian Liu, Lihong Zhang, Yanyong Li
المصدر: Applied Surface Science. 490:611-621
مصطلحات موضوعية: Materials science, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Catalysis, Propene, chemistry.chemical_compound, chemistry, Chemical engineering, X-ray photoelectron spectroscopy, Propane, Interstitial defect, Dehydrogenation, 0210 nano-technology, Bimetallic strip
الوصف: A series of novel γ-Al2O3 supported Pt In bimetallic catalysts were prepared by perovskite (PTO) lattice interstitial confined reduction and compared with industrial catalyst PtIn/γ-Al2O3 in the propane dehydrogenation to propene. The physics-chemistry properties of all catalysts and precursors were characterized by BET, NH3-TPD, TPR, XRD, TEM, STEM-EDS, XPS, TG and O2-TPO techniques. The results show that the metal ions of Pt4+ and In3+ confined in PTO lattice interstitial sites were more easily reduced than those confined in PTO lattice. The lattice interstitial confinement was beneficial for the formation of small and highly dispersed Pt In bimetallic species on the surface of γ-Al2O3 supported PTO Nano islands. It is just the confinement of PTO lattice interstitial sites for appropriate In3+/In0 ratio and weak Pt In interaction and the sharing Al O bond for anchoring PTO nanoparticles and weakening the surface acid sites result in the high activity and superior stability of PtIn/LaAlO3/γ-Al2O3 in propane dehydrogenation. The initial propane conversion of PtIn/LaAlO3/γ-Al2O3 was 47%, and can be maintained at 25% after 16 h, while its propene selectivity only decreased from 96% to 90%.
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