Catalysts of self-assembled Pt@CeO<inf>2âˆ’Î´</inf>-rich core-shell nanoparticles on 3D ordered macroporous Ce<inf>1âˆ’x</inf>Zr<inf>x</inf>O<inf>2</inf>for soot oxidation: nanostructure-dependent catalytic activity
MetadataShow full item record
Â© The Royal Society of Chemistry. The catalytic performance in heterogeneous catalytic reactions consisting of solid reactants is strongly dependent on the nanostructure of the catalysts. Metal-oxides core-shell (MOCS) nanostructures have potential to enhance the catalytic activity for soot oxidation reactions as a result of optimizing the density of active sites located at the metal-oxide interface. Here, we report a facile strategy for fabricating nanocatalysts with self-assembled Pt@CeO 2âˆ’Î´ -rich core-shell nanoparticles (NPs) supported on three-dimensionally ordered macroporous (3DOM) Ce 1âˆ’x Zr x O 2 via the in situ colloidal crystal template (CCT) method. The nanostructure-dependent activity of the catalysts for soot oxidation were investigated by means of SEM, TEM, H 2 -TPR, XPS, O 2 -isothermal chemisorption, soot-TPO and so on. A CeO 2âˆ’Î´ -rich shell on a Pt core is preferentially separated from Ce 1âˆ’x Zr x O 2 precursors and could self-assemble to form MOCS nanostructures. 3DOM structures can enhance the contact efficiency between catalysts and solid reactants (soot). Pt@CeO 2âˆ’Î´ -rich core-shell nanostructures can optimize the density of oxygen vacancies (O v ) as active sites located at the interface of Pt-Ce 1âˆ’x Zr x O 2 . Remarkably, 3DOM Pt@CeO 2âˆ’Î´ -rich/Ce 1âˆ’x Zr x O 2 catalysts show super catalytic performance and strongly nanostructure-dependent activity for soot oxidation in the absence of NO and NO 2 . For example, the T 50 of the 3DOM Pt@CeO 2âˆ’Î´ -rich/Ce 0.8 Zr 0.2 O 2 catalyst is lowered down to 408 Â°C, and the reaction rate of the 3DOM Pt@CeO 2âˆ’Î´ -rich/Ce 0.2 Zr 0.8 O 2 catalyst (0.12 Î¼mol g âˆ’1 s âˆ’1 ) at 300 Â°C is 4 times that of the 3DOM Pt/Ce 0.2 Zr 0.8 O 2 catalyst (0.03 Î¼mol g âˆ’1 s âˆ’1 ). The structures of 3DOM Ce 1âˆ’x Zr x O 2 -supported Pt@CeO 2âˆ’Î´ -rich core-shell NPs are decent systems for deep oxidation of solid reactants or macromolecules, and this facile technique for synthesizing catalysts has potential to be applied to other element compositions.
Showing items related by title, author, creator and subject.
Duan, Xiaoguang; Sun, Hongqi; Wang, Shaobin (2018)Conspectus Catalytic processes have remarkably boosted the rapid industrializations in chemical production, energy conversion, and environmental remediation. As one of the emerging applications of carbocatalysis, metal-free ...
Core-Shell Structured PtRuCo x Nanoparticles on Carbon Nanotubes as Highly Active and Durable Electrocatalysts for Direct Methanol Fuel CellsCheng, Y.; Shen, P.; Saunders, M.; Jiang, San Ping (2015)Ternary alloy PtRuCox nanoparticles (NPs) with Co-rich core and PtRu skinned shell on carbon nanotubes (CNTs) have been successfully synthesized as electrocatalysts for methanol oxidation reaction (MOR) of direct methanol ...
Core-Shell Structured PtRuCo<inf>x</inf> Nanoparticles on Carbon Nanotubes as Highly Active and Durable Electrocatalysts for Direct Methanol Fuel CellsCheng, Yi; Shen, P.; Saunders, M.; Jiang, San Ping (2015)© 2015 Elsevier Ltd. Ternary alloy PtRuCo<inf>x</inf> nanoparticles (NPs) with Co-rich core and PtRu skinned shell on carbon nanotubes (CNTs) have been successfully synthesized as electrocatalysts for methanol oxidation ...