Facile Synthesis and Characterization of Nanostructured Transition Metal/Ceria Solid Solutions (TMxCe1-xO2-δ, TM = Mn, Ni, Co, or Fe) for CO Oxidation

Kyung Joo Lee, Yongseon Kim, Jae Hwa Lee, Sung June Cho, Ja Hun Kwak, Hoi Ri Moon

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We developed a general synthetic route for preparing nanoporous transition metal/ceria solid solutions with nanocrystalline frameworks (TMxCe1-xO2-δ, TM = Mn, Ni, Co, or Fe). Their structural properties were characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRPD), and N2 sorption. Through thermolysis of bimetallic coordination polymers, hierarchically nanoporous frameworks composed of 3-4 nm TMxCe1-xO2-δ solid solution nanocrystals in which the transition metal ions are well-dispersed in the ceria lattice as evidenced by the Rietveld refinement of the XRPD patterns were synthesized. The electronic properties of the MnxCe1-xO2-δ solid solutions at up to 20 mol % were examined by Raman spectroscopy and X-ray photoelectron spectroscopy analysis, and H2-temperature-programmed reduction results demonstrated the altered physicochemical properties, e.g., hydrogen reduction behaviors, due to the doping. CO oxidation studies of MnxCe1-xO2-δ reveal that the Mn species are responsible for increasing the catalytic activity by an order of magnitude compared to that of pure ceria, by creating nanostructures with accessible pores and active sites on the inner surface. This facile synthetic approach can create nanoporous solid solutions with nanocrystalline frameworks and devise structures and compositions. Therefore, our approach opens new avenues for developing multimetallic catalyst systems.

Original languageEnglish
Pages (from-to)2874-2882
Number of pages9
JournalChemistry of Materials
Issue number7
StatePublished - 11 Apr 2017

Bibliographical note

Funding Information:
We acknowledge financial support from a National Research Foundation (NRF) grant from the Korean Government (MSIP) (2016R1A5A1009405). J.H.L. acknowledges a Global Ph.D. Fellowship (NRF-2013H1A2A1033501). S.J.C. is thankful for a Korea CCS R&D Center (KCRC) grant from the Korean Ministry of Science, ICT & Future Planning (NRF-2014M1A8A1049254).

Publisher Copyright:
© 2017 American Chemical Society.


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