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Redox behavior of gold supported on ceria and ceria-zirconia based catalysts

Journal of Rare Earths 2009年第2期27卷 196-203页

作者： Michela Vicario Jordi Llorca Marta Boaro Carla de Leitenburg alessandro trovarelli Dipartimento di Scienze e Tecnologie Chimiche Università di UdineVia del Cotonificio 10833100 UdineItaly Institut de Tècniques Energètiques Universitat Politècnica de CatalunyaDiagonal 647ed. ETSEIB08028 BarcelonaSpain

A series of gold-based catalysts were prepared by deposition precipitation or incipient wetness impregnation on CexZ1-xO2 solid solutions （0.28≤x≤1.00）. The morphological and structural characterization of these catalysts were carried out with X-ray diffraction, trans- mission electron microscopy （TEM） analysis and physical adsorption technique, and their redox properties were studied by temperature programmed reduction using both H2 and CO as probe molecules. Two cycles of oxidation/reduction were carried out in order to evaluate the effects of redox aging and gold sintering on the oxygen exchange capability. As observed with other noble metals, gold enhanced and promoted the ceria reduction at lower temperatures. Reduction by CO was shown to be dependent on the fine dispersion of gold and to be nega- tively affected by the ageing process more than reduction with hydrogen. This might have implications in reactions like water gas shift and CO-PROX which involve CO as a main reactant.

关键词： gold ceria zirconia catalysis reduction behaviour nanoparticles temperature programmed reduction X-ray diffraction rare earths

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Structure-activity relationship in Pd/CeO2 methane oxidation catalysts

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Chinese Journal of Catalysis 2020年第6期41卷 938-950页

作者： Sara Colussi Paolo Fornasiero alessandro trovarelli Dipartimento Politecnico Universitàdi UdineUnitàdi Ricerca INSTM Udinevia del Cotonificio 10833100 UdineItaly Dipartimento di Scienze Chimiche e Farmaceutiche Unitàdi Ricerca di Trieste ICCOM-CNRINSTM TriesteUniversitàdi Triestevia L.Giorgieri134127 TriesteItaly

Palladium based catalysts are the most active for methane oxidation. The tuning of their composition, structure and morphology at macro and nanoscale can alter significantly their catalytic behavior and robustness with a strong impact on their overall performances. Among the several combinations of supports and promoters that have been utilized, Pd/CeO2 has attracted a great attention due to its activity and durability coupled with the unusually high degree of interaction between Pd/Pd O and the support. This allows the creation of specific structural arrangements which profoundly impact on methane activation characteristics. Here we want to review the latest findings in this area, and particularly to envisage how the control(when possible) of Pd-CeO2 interaction at nanoscale can help in designing more robust methane oxidation catalysts.

关键词： Palladium Ceria Methane catalytic oxidation Pd-ceria interaction Nanostructure

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