Abstract
Catalytic oxidation of carbon monoxide (CO) is of great importance in many different fields of industry. Until now it still remains challenging to use non-noble metal based catalysts to oxidize CO at low temperature. Herein, we report a new class of nanoporous, uniform, and transition metal-doped cerium (IV) oxide (ceria, CeO2) microsphere for CO oxidation catalysis. The porous and uniform microsphere is generated by sacrificed polymer template. Transition-metals, like Cu, Co, Ni, Mn and Fe, were doped into CeO2 microspheres. The combination of hierarchical structure and metal doping afford superior catalytic activities of the doped ceria microspheres, which could pave a new way to advanced non-precious metal based catalysts for CO oxidation.
Highlights
Catalytic oxidation of carbon monoxide is of great importance in a variety of practical applications, such as automobile exhaust purifiers, CO gas masks and CO sensors[1]
Metal oxide nanoparticles developed and cerium (IV) oxide microspheres formed after calcination in a muffle furnace at 600 °C, during which process polymer template was removed
The scanning electron microscopy (SEM) images of metal doped ceria microspheres were shown in Fig. 2a,b and Supplementary Fig. S1, indicating microsized and monodisperse morphologies of the resulting CuxCeO2−X microsphere and other ceria hybrids, which were similar to those of the parent microspheres and CeO2 microspheres without metal-doping
Summary
Structures for CO Oxidation received: 13 January 2016 accepted: 16 March 2016 Published: 31 March 2016. CO oxidation mechanisms were studied and metal-support interaction between nanoparticles and the supports partly accounted for the improvement of catalytic activities[8,9,10] Those noble metal based catalysts are still expensive, scarce and sensitive to impurities for deactivation[11], which hinder their widespread applications. The porous ZrO2, Pt/CeO2 microspheres prepared by such templates showed superior catalytic activities in the Friedel-Crafts alkylation of indoles and catalytic reduction of 4-nitrophenol[37] We employed such polymer templates to construct monodisperse and uniform CeO2 microspheres, and further modified the materials by metal doping. It was found that Cu doped porous CeO2 microspheres exhibited the highest catalytic activity, which was much better than that of the undoped CeO2 microspheres or the counterparts with ill-defined structures This new approach of constructing transition metal hybrid nanoporous metal oxide microspheres showed high potential in the development of CO oxidation catalysts
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