Fabrication of highly dispersed Pt-based catalysts on γ-Al2O3 supported perovskite Nano islands: High durability and tolerance to coke deposition in propane dehydrogenation

IF 6.6 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2019-10-01 Epub Date: 2019-06-01 DOI:10.1016/j.apsusc.2019.05.364

Xingye Chen, Meng Ge, Yanyong Li, Yatian Liu, Jiameng Wang, Lihong Zhang

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引用次数: 21

Abstract

A series of novel γ-Al₂O₃ supported PtIn 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 PtIn 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 PtIn interaction and the sharing AlO 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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在γ-Al2O3负载的钙钛矿纳米岛上制备高分散pt基催化剂:高耐久性和耐丙烷脱氢过程中积炭

采用钙钛矿(PTO)晶格间限还原法制备了一系列新型γ-Al2O3负载型PtIn双金属催化剂，并与丙烷脱氢制丙烯的工业催化剂PtIn/γ-Al2O3进行了比较。采用BET、NH3-TPD、TPR、XRD、TEM、STEM-EDS、XPS、TG和O2-TPO等技术表征了催化剂和前驱体的理化性质。结果表明，局限于PTO晶格间隙的金属离子Pt4+和In3+比局限于PTO晶格的金属离子更容易被还原。晶格间隙约束有利于在γ-Al2O3负载的PTO纳米岛表面形成小而高度分散的PtIn双金属物质。PtIn/LaAlO3/γ-Al2O3在丙烷脱氢过程中具有较高的活性和稳定性，正是由于限制了PTO晶格间隙位以形成适当的In3+/In0比和弱的PtIn相互作用，以及共享的AlO键来锚定PTO纳米粒子和弱化表面酸位。PtIn/LaAlO3/γ-Al2O3的初始丙烷转化率为47%，在16 h后可保持在25%，而丙烯选择性仅从96%下降到90%。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.