NDLI: Uniform nanoparticles building Ce$_{1−x }$Pr$_{ x }$O$_{2−δ}$ mesoarchitectures: structure, morphology, surface chemistry, and catalytic performance

Content Provider	Springer Nature Link
Author	Somacescu, Simona Parvulescu, Viorica Calderon More, Jose Maria Suh, Soong Hyuck Osiceanu, Petre Su, Bao Lian
Copyright Year	2012
Abstract	Ce$_{1−x }$Pr$_{ x }$O$_{2−δ}$ (x = 0, 0.1, 0.5, 0.9) mesoarchitectures built from nanoparticles with crystalline framework have been synthesized by the self-assembly method assisted by surfactants and hydrothermal treatment. Cetyltrimethylammonium bromide (CTAB) was used as template, urea as hydrolyzing agent and tetraethylammonium hydroxide (TEAOH) as pH mediator to obtain pH 9. The inorganic precursors have been co-assembled with surfactant template to produce mesoarchitectures which have uniform pore size distribution, crystalline channel walls, high thermal stability, and high catalytic activity in the oxidation reaction of methane. The resulting powders, calcined at 550 °C, were characterized by X-ray diffraction (XRD), Raman spectroscopy, N$_{2}$ adsorption/desorption isotherms (BET), thermogravimetric analysis (TG-DTG), scanning and transmission electron microscopy (SEM, TEM, and HRTEM), and X-ray photoelectron spectroscopy (XPS). The as-synthesized mesoporous nanoparticles are single-phase fluorite Ce$_{1−x }$Pr$_{ x }$O$_{2−δ}$ solid solution without additional Ce- or Pr-based oxides, or secondary phases with different lattice symmetry or stoichiometry. A clear morphology of dispersed nanoparticles, with uniform grain size between 5 and 7 nm, and mean pore size around 5 nm, have been observed. The specific surface area of the as-synthesized mesoporous samples after calcination at 550 °C remains in the range 60–150 m$^{2}$ g$^{−1}$. All the spectroscopic methods clearly confirm the homogeneous incorporation of Pr into the CeO$_{2}$ lattice of the nanocrystallites, to form a single-phase solid solution with fluorite structure, modifying the absorption spectra of the nanocrystallites. All the samples showed high catalytic activity in the oxidation reactions of methane.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	6
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceria praseodymia Nanostructure Mesostructure Solid solution Hydrocarbons oxidation Optics, Optoelectronics, Plasmonics and Optical Devices Physical Chemistry Characterization and Evaluation of Materials Inorganic Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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