Nonthermal Synthesis of Three-Dimensional Metal Oxide Structures under Continuous-Flow Conditions and Their Catalytic Applications

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Author list: King'ondu CK, Opembe NN, Genuino HC, Garces HF, Njagi EC, Iyer A, Huang H, Dharmarathna S, Suib SL

Publisher: American Chemical Society

Place: WASHINGTON

Publication year: 2011

Journal: Journal of Physical Chemistry C (1932-7447)

Journal acronym: J PHYS CHEM C

Volume number: 115

Issue number: 47

Start page: 23273

End page: 23282

Number of pages: 10

ISSN: 1932-7447

eISSN: 1932-7455

Languages: English-Great Britain (EN-GB)

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Abstract

Continuous-flow synthesis of one-dimensional (1D) metal oxide nanostructures and/or their integration into hierarchical structures under nonthermal conditions is still a challenge. In this work, a nonthermal, continuous-flow approach for the preparation of gamma-manganese oxide (gamma-MnO2) and cerium oxide (CeO2) microspheres has been developed. By this technique, gamma-MnO2 materials with surface areas of 240, 98, and 87 m(2)/g and CeO2 microspheres with a surface area of 1 m(2)/g have been fabricated successfully. Characterization of the materials was carried out using powder X-ray diffraction, infrared and inductively coupled plasma optical emission spectrometer (ICP/OES), nitrogen sorption, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis. The synthesized materials showed good catalytic activity in the oxidation of alpha-methyl styrene.

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