@article { ISI:000230848700026,
	title = {Nature of manganese species in Ce1-xMnxO2-delta solid solutions synthesized by the solution combustion route},
	journal = {Chemistry of Materials},
	volume = {17},
	number = {15},
	year = {2005},
	month = {JUL},
	pages = {3983-3993},
	publisher = {AMER CHEMICAL SOC},
	type = {Article},
	address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
	abstract = {<p>A series of manganese-cerium oxide composites with Mn concentrations in the range of 1-20 mol \% in ceria was prepared by the solution combustion technique using urea as fuel. The nature, type, and oxidation state of Mn species in ceria were investigated by X-ray diffraction (XRD), diffuse reflectance UV-visible spectroscopy, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy, and temperature-programmed reduction techniques. The study reveals that the method of preparation significantly influences the type of manganese species in ceria. Wet-impregnation, coprecipitation, and solid-state synthesis techniques lead to clustered MnOx-like species in the ceria matrix, while the present method of preparation (solution combustion route) yields a highly dispersed form of Mn species. In the reported series of samples, Mn is present mainly in +2 and +3 oxidation states and there is no evidence for the presence of Mn 41 species. Powder X-ray diffraction studies at variable temperatures (298-1323 K) indicate the formation of Ce1-xMnxO2-delta Solid solutions. No separate MnOx-type phase was detected even at 1323 K. EPR studies reveal that the isolated Mn2+ and Mn2+ species are present in at least three different structural locations: species A, Mn ions in ceria-lattice defect sites; species B, Mn ions in framework Ce4+ locations; and species C, Mn ions in interstitial locations and at the surface of ceria. The Mn3+ ions in ceria exhibit a facile reduction and reoxidation behavior when exposed to dry hydrogen and subsequently to air at elevated. temperatures. A highly dispersed state of Mn3+ and Mn2+ in ceria, facile redox behavior, and a synergistic Mn-ceria interaction are some of the unique properties of this material prepared by the solution combustion procedure.</p>},
	issn = {0897-4756},
	doi = {10.1021/cm050401j},
	author = {Murugan, B. and Ramaswamy, A. V. and Srinivas, D. and Gopinath, Chinnakonda S. and Ramaswamy, V.}
}
@article { ISI:000327481200002,
	title = {Noble metal promoted CeO2-ZrO2-supported ni catalysts for liquid-phase hydrogenation of cinnamaldehyde},
	journal = {Catalysis Letters},
	volume = {143},
	number = {12},
	year = {2013},
	month = {DEC},
	pages = {1266-1276},
	publisher = {SPRINGER},
	address = {233 SPRING ST, NEW YORK, NY 10013 USA},
	abstract = {<p>Pd or Pt promoted CeO2-ZrO2-supported Ni catalysts exhibited superior catalytic activity to the hitherto known Ni catalysts for liquid-phase hydrogenation of cinnamaldehyde at moderate conditions. Under similar experimental conditions, the unpromoted catalyst was selective for hydrocinnamaldehyde product (C=C hydrogenation) whereas the promoted catalyst yielded 3-phenyl propanol (C=C and C=O hydrogenation product). Enhanced dispersion of Ni was the cause for higher activity of the promoted Ni catalysts.</p>},
	keywords = {Ceria-zirconia, Cinnamaldehyde, Noble metal promoted catalyst, Selective hydrogenation, Supported Ni catalyst},
	issn = {1011-372X},
	doi = {10.1007/s10562-013-1064-9},
	author = {Bhogeswararao, Seemala and Kumar, V. Pavan and Chary, K. V. R. and Srinivas, D.}
}
