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Noble metal ions in CeO2 and TiO2: synthesis, structure and catalytic properties

机译:CeO2和TiO2中贵金属离子:合成,结构和催化性能

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摘要

In the past four decades, CeO2 has been recognized as an attractive material in the area of auto exhaust catalysis because of its unique redox properties. In the presence of CeO2, the catalytic activity of noble metals supported on Al2O3 is enhanced due to higher dispersion of noble metals in their ionic form. In the last few years, we have been exploring an entirely new approach of dispersing noble metal ions on CeO2 and TiO2 matrices for redox catalysis. In this study, the dispersion of noble metal ions by solution combustion as well as other methods over CeO2 and TiO2 resulting mainly in Ce1-xMxO2-delta, Ce1-x-yTixMyO2-delta, Ce1-x-ySnxMyO2-delta, Ce1-x-yFexMyO2-delta, Ce1-x-yZrxMyO2-delta and Ti1-xMxO2-delta (M = Pd, Pt, Rh and Ru) catalysts, the structure of these materials, their catalytic properties toward different types of catalysis, structure-property relationships and mechanisms of catalytic reactions are reviewed. In these catalysts, noble metal ions are incorporated into a substrate matrix to a certain limit in a solid solution form. Lower valent noble metal-ion substitution in CeO2 and TiO2 creates noble metal ionic sites and oxide ion vacancies that act as adsorption sites for redox catalysis. It has been demonstrated that these new generation noble metal ionic catalysts (NMIC) have been found to be catalytically more active than conventional nanocrystalline noble metal catalysts dispersed on oxide supports.
机译:在过去的四十年中,由于其独特的氧化还原性能,CEO2被认为是自动排气催化区域的有吸引力的材料。在CeO 2存在下,由于贵金属在其离子形式的较高分散中,增强了Al 2 O 3上负载的贵金属的催化活性。在过去的几年中,我们一直在探索在CeO2和TiO2基质上分散贵金属离子的全新方法,用于氧化还原催化。在这项研究中,贵金属离子通过溶液燃烧分散以及CeO2和TiO2上的其他方法主要在Ce1-XMXO2-Delta,Ce1-X-Ytixmyo2-delta,Ce1-X-Ysnxmyo2-delta,Ce1-x -yfexmyo2-delta,Ce1-x-yzrxmyo2-delta和Ti1-xMxO2-delta(m = Pd,Pt,Rh和Ru)催化剂,这些材料的结构,它们对不同类型的催化性质,结构性质的关系综述了催化反应的机制。在这些催化剂中,贵金属离子掺入基质基质中以固体溶液形式的一定限度。 CEO2和TiO2中的低度量贵金属金属离子替代品产生贵金属离子位点和氧化物离子空位,其充当氧化还原催化的吸附位点。已经证明,已发现这些新一代贵金属离子催化剂(NMIC)催化更活跃,而不是分散在氧化物载体上的常规纳米晶体贵金属催化剂。

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  • 来源
    《RSC Advances》 |2015年第115期|共31页
  • 作者单位

    CSIR Natl Aerosp Labs Surface Engn Div Bangalore 560017 Karnataka India;

    Indian Inst Sci Solid State &

    Struct Chem Unit Bangalore 560012 Karnataka India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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