Metal Support Interaction Effects on the Reducibility of Ir Nanoparticles on Titania Nanotubes

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• 作者：José A. Toledo-Antonio ; Carlos Angeles-Chávez…
• 关键词：Iridium nanoparticles ; TiO2 nanotube ; Anatase ; Cyclohexene hydrogenation/dehydrogenation ; Metal support interaction
• 刊名：Topics in Catalysis
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：59
• 期：2-4
• 页码：366-377
• 全文大小：3,938 KB
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• 作者单位：José A. Toledo-Antonio (1)
  Carlos Angeles-Chávez (1)
  Ma. Antonia Cortés-Jácome (1)
  I. Cuauhtémoc-López (1)
  E. López-Salinas (1)
  Ma. Lourdes Mosqueira (1)
  G. Ferrat (1)
  
  1. Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas # 152, 07730, Mexico, DF, Mexico
  
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028

文摘

H₂IrCl₆ was impregnated on three types of materials: (i) anatase TiO₂ nanoparticles, (ii) anatase TiO₂ nanotubes and as a comparison, (iii) alumina Al₂O₃, with a view to reveal the effect of the support on Ir nanoparticles size, dispersion, morphologies, metal support interaction (MSI), and eventually on the catalytic activity in the hydrogenation of cyclohexene (CHE) at 273–303 K. Particularly, we focused on TiO₂ nanotubes as being scarcely examined as supports of Ir particles. Highly dispersed 1.3 nm half truncated cuboctahedral particles and full 1.4 nm cuboctahedral Ir nanoparticles on TiO₂ nanoparticles and TiO₂ nanotubes, respectively, were revealed by transmission electron microscopy and molecular modeling. These two, morphologically different TiO₂ supports show different MSI to Ir nanoparticles, affecting their metallic character and catalytic performance during CHE hydrogenation. At 273 K, complete cuboctahedral Ir particles (on TiO₂ nanotubes) showed a TOF of 4.7 s−1 which was slightly more active than truncated ones (on TiO₂ nanoparticles and Al₂O₃) showing a TOF of 3.2–3.7 s−1. Iridium truncated nanoparticles were probably not completely reduced to Ir0 and exhibited poor metallic character due to an electronic screening at the metal support interaction, which explain the different TOF in CHE hydrogenation. Keywords Iridium nanoparticles TiO₂ nanotube Anatase Cyclohexene hydrogenation/dehydrogenation Metal support interaction