Effect of interparticle interaction on the low temperature oxidation of CO over size-selected Au nanocatalysts supported on ultrathin TiC films

    Authors

    L. K. Ono;B. Roldan-Cuenya

    Comments

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    Abbreviated Journal Title

    Catal. Lett.

    Keywords

    catalysis; Au nanoparticle; diblock copolymer; sintering; CO oxidation; interparticle interaction; size effects; XPS; TPD; AFM; ELECTRON-BEAM LITHOGRAPHY; MODEL CATALYSTS; SURFACE-DIFFUSION; GOLD; CATALYSTS; POLLUTION-ABATEMENT; BROWNIAN MIGRATION; CLUSTERS; NANOPARTICLES; METAL; PLATINUM; Chemistry, Physical

    Abstract

    This work aims to get insight into the influence of interparticle interactions on catalysis. The low temperature CO oxidation is used as a model reaction. A strong dependence of the catalytic activity and stability of gold nanoparticles uniformly dispersed on polycrystalline TiC films was observed as a function of the interparticle distance. Two samples with similar height distributions (similar to 2 nm), but with different average interparticle distances (similar to 30 and similar to 80 nm), were synthesized using diblock copolymer encapsulation. Their chemical reactivity was investigated by temperature programmed desorption (TPD), and reactive coarsening and subsequent deactivation was observed for the sample with the smallest interparticle distance. The system with the largest average interparticle distance showed higher stability towards agglomeration and longer lifetime.

    Journal Title

    Catalysis Letters

    Volume

    113

    Issue/Number

    3-4

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    86

    Last Page

    94

    WOS Identifier

    WOS:000245131000003

    ISSN

    1011-372X

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