title: Mesoporous CeO₂ nanoparticles synthesized by an inverse miniemulsion technique and their catalytic properties in methane oxidation.
abstract: Cerium(IV) oxide nanoparticles were synthesized using an inverse miniemulsion technique with cerium nitrate hexahydrate as precursor. The resulting nanocrystallites are as small as 5 nm with a specific surface area of 158 m² g⁻¹ after calcination at 400 °C. With the addition of cetyltrimethylammonium bromide (CTAB) or (poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)) triblock copolymers (PEO-PPO-PEO) as template in the miniemulsion droplets, the specific surface area can be increased up to 255 m² g⁻¹. The miniemulsions were characterized by dynamic light scattering (DLS) and the obtained oxides were examined by x-ray diffraction (XRD), nitrogen sorption (BET and BJH), and transmission electron microscopy (TEM). The catalytic activity of the resulting ceria was investigated for the temperature-programmed oxidation (TPO) of methane.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Nermeen
authors.initials: N
authors.lastname: Nabih
authors.forename: Renate
authors.initials: R
authors.lastname: Schiller
authors.forename: Ingo
authors.initials: I
authors.lastname: Lieberwirth
authors.forename: Emanuel
authors.initials: E
authors.lastname: Kockrick
authors.forename: Robert
authors.initials: R
authors.lastname: Frind
authors.forename: Stefan
authors.initials: S
authors.lastname: Kaskel
authors.forename: Clemens K
authors.initials: CK
authors.lastname: Weiss
authors.forename: Katharina
authors.initials: K
authors.lastname: Landfester
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D016062:Porosity
chemical_list: D002563:Cerium; C030583:ceric oxide; D008697:Methane