NDLI: Effect of ethylene glycol on structure, thermal stability, oxygen storage capacity, and catalytic CO and CH$_{4}$ oxidation activities of binary CeO$_{2}$–Al$_{2}$O$_{3}$ and ternary CeO$_{2}$–ZrO$_{2}$–Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Osaki, Toshihiko
Copyright Year	2016
Abstract	Porous and homogeneous cryogels of binary ceria-alumina (CA) and ternary ceria-zirconia-alumina (CZA) were prepared from cerium nitrate, zirconium (IV) dinitrate oxide hydrate, and aluminium sec-butoxide by a one-pot sol–gel technique in an aqueous system and subsequent freeze drying, and effect of ethylene glycol (EG) used for chelation of cerium ions on structure, thermal stability, reducibility, oxygen storage capacity, and catalytic carbon monoxide and methane oxidation activities of the catalysts was investigated. EG did not significantly affect surface area, pore volume, mean pore size, and surface morphology of the catalysts after calcination and subsequent oxidative/reductive atmosphere heating at 900 °C. Whereas use of EG resulted in much finer particles of cerium oxides and ceria-zirconia solid solution for CA and CZA, respectively, distributed throughout alumina with high dispersion. X-ray diffraction (XRD) and Raman spectra suggested that while a cubic CeO$_{2}$ phase was observed for CA after the oxidative heating regardless of whether or not EG was employed, finely-divided cerium oxides or crystalline CeAlO$_{3}$ were respectively obtained after the reductive heating depending on whether EG was respectively used or not used. As for CZA, while a pseudo-cubic t″ phase was seen after the reductive heating regardless of whether EG was used or not, mixed phases of pseudo-cubic t″ and cubic or a cubic one were respectively observed after the oxidative heating depending on whether EG was respectively employed or not employed. The solid solubility of zirconia in ceria was improved by EG for CZA. The oxygen storage capacity and catalytic CH$_{4}$ and CO oxidation activities were also enhanced by employing EG for both catalysts, which was ascribed fundamentally to the finer particles of cerium oxides and ceria-zirconia solid solution for CA and CZA, respectively, although CO oxidation on CA was unimproved by EG after the reductive heating.
Starting Page	133
Ending Page	147
Page Count	15
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	82
Issue Number	1
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2016-12-15
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CeO$_{2}$–Al$_{2}$O$_{3}$ CeO$_{2}$–ZrO$_{2}$–Al$_{2}$O$_{3}$ Sol–gel Cryogel Ethylene glycol Oxygen storage capacity CO and CH$_{4}$ oxidation Ceramics, Glass, Composites, Natural Materials Inorganic Chemistry Optical and Electronic Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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