Daniela Terribile

Bio: Daniela Terribile is an academic researcher from University of Udine. The author has contributed to research in topics: Medicine & Breast cancer. The author has an hindex of 5, co-authored 6 publications receiving 731 citations.

The synthesis and characterization of mesoporous high-surface area ceria prepared using a hybrid organic/inorganic route

Abstract: The synthesis, characterization, and proposed formation mechanism of mesoporous high surface area ceria is described. It is shown that the reaction of cerium salts under basic conditions with ammonia in the presence of a cationic surfactant results in the precipitation of a gelatinous hydrous cerium oxide/surfactant mixture, which after drying and calcination gives pure, high surface area, fluorite-structured CeO2. Although ceria does not show long range mesoscopic organization, it exhibits a broad arrangement of mesopores in the region 20–80 A with a maximum located at around 35–40 A. HRTEM detected very small crystalline CeO2particles with an approximate dimension of 20–50 A. This ceria shows enhanced textural and thermal resistance features compared with ceria prepared by conventional routes. Surface areas in excess of 200 m2/g are obtained after calcination atT=723 K, which drop to ca 40 m2/g after calcination atT>1173 K; this highlights its better potential to operate as a catalyst support or promoter under medium/high temperature range. It is suggested that the cationic surfactant does not act as a true templating agent but as a surface-area enhancer by incorporation into the hydrous oxide and lowering of the surface tension of water in the pores during drying.

The preparation of high surface area CeO2-ZrO2 mixed oxides by a surfactant-assisted approach

Abstract: The study investigates the preparation of high surface area, three-way catalysts (TWC)-like, ceria–zirconia mixed oxide. It is shown that under basic conditions cationic surfactants effectively incorporate into hydrous oxides of cerium and zirconium. The presence of cerium inhibits the action of alkyl-trimethyl-ammonium salts as true templating agents and there is no formation of a regular pore structure. The elimination of surfactants upon calcination gives rise to the formation of high surface area, fluorite-structured CeO2–ZrO2 solid solution characterized by a fairly good compositional homogeneity. Surface areas in excess of 230 m2/g were obtained after calcination at 723 K, which drop to ca. 40 m2/g following treatment at 1173 K.

Catalytic combustion of hydrocarbons with Mn and Cu-doped ceria–zirconia solid solutions

Abstract: The catalytic activity of a series of CeO2–ZrO2 mixed oxides in the total oxidation of methane and light hydrocarbons has been investigated. The influence of dopants like Mn and Cu has also been studied. It is shown that both MnOx and CuO at low loading dissolve within the ceria–zirconia lattice. This strongly influences the redox behaviour of the catalysts by promoting low-temperature reduction of Ce4+. In addition, the ternary oxides show better stability to repeated redox cycles, which is attributed to the presence of ZrO2. The catalytic activity of pure CeO2 is also enhanced in the presence of ZrO2, reaching a maximum with Ce0.92Zr0.08O2; a further promotion of activity is observed with the introduction of MnOx and CuO dissolved into CeO2–ZrO2 lattice.

Unusual Oxygen Storage/Redox Behavior of High-Surface-Area Ceria Prepared by a Surfactant-Assisted Route

Abstract: The interaction of hydrous cerium oxide with cationic surfactants under basic conditions is used for the first time in the preparation of CeO2 with enhanced textural and redox properties. The reduction of Ce4+ to Ce3+ is strongly augmented, especially in the low-temperature regime, resulting in a broadening of the window of stability of Ce3+. This is accompanied by an increase of thermal stability in the region 900−1150 K.

Fast oxygen uptake/release over a new CeOx phase

Abstract: High-temperature reduction/oxidation cycles promote the oxygen storage capacity of mesoporous ceria; this is associated with the formation during reduction of a hexagonal CeOx phase which on reoxidation gives amorphous ceria.

Use of CeO2-based oxides in the three-way catalysis

Abstract: In the present paper the use of CeO 2 -based materials in the automotive three-way catalysts (TWCs) is considered. The multiple roles of CeO 2 as a TWC promoter and in particular the oxygen storage/release capacity (OSC) are critically discussed. Attention is focused on the advanced OSC materials containing ZrO 2 , which are employed in the last generation of catalytic automotive converters.

Synthesis and Properties of Biocompatible Water-Soluble Silica-Coated CdSe/ZnS Semiconductor Quantum Dots†

Abstract: We describe the synthesis of water-soluble semiconductor nanoparticles and discuss and characterize their properties. Hydrophobic CdSe/ZnS core/shell nanocrystals with a core size between 2 and 5 nm are embedded in a siloxane shell and functionalized with thiol and/or amine groups. Structural characterization by AFM indicates that the siloxane shell is 1−5 nm thick, yielding final particle sizes of 6−17 nm, depending on the initial CdSe core size. The silica coating does not significantly modify the optical properties of the nanocrystals. Their fluorescence emission is about 32−35 nm fwhm and can be tuned from blue to red with quantum yields up to 18%, mainly determined by the quantum yield of the underlying CdSe/ZnS nanocrystals. Silanized nanocrystals exhibit enhanced photochemical stability over organic fluorophores. They also display high stability in buffers at physiological conditions (>150 mM NaCl). The introduction of functionalized groups onto the siloxane surface would permit the conjugation of ...

Automotive catalytic converters: current status and some perspectives

Abstract: Automotive three-way catalysts (TWCs) have represented over the last 25 years one of the most successful stories in the development of catalysts. The aim of this paper is to illustrate the technology for abatement of exhaust emissions by analysing the current understanding of TWCs, the specific role of the various components, the achievements and the limitations. The challenges in the development of new automotive catalysts, which can meet future highly demanding pollution abatement requirements, are also discussed.

Nanostructured ceria-based materials: synthesis, properties, and applications

Abstract: The controllable synthesis of nanostructured CeO2-based materials is an imperative issue for environment- and energy-related applications. In this review, we present the recent technological and theoretical advances related to the CeO2-based nanomaterials, with a focus on the synthesis from one dimensional to mesoporous ceria as well as the properties from defect chemistry to nano-size effects. Seven extensively studied aspects regarding the applications of nanostructured ceria-based materials are selectively surveyed as well. New experimental approaches have been demonstrated with an atomic scale resolution characterization. Density functional theory (DFT) calculations can provide insight into the rational design of highly reactive catalysts and understanding of the interactions between the noble metal and ceria support. Achieving desired morphologies with designed crystal facets and oxygen vacancy clusters in ceria via controlled synthesis process is quite important for highly active catalysts. Finally, remarks on the challenges and perspectives on this exciting field are proposed.

The utilization of ceria in industrial catalysis

Abstract: The main applications of cerium dioxide in industrial catalysis are reviewed, with particular attention to the role played by ceria. The main uses of CeO2 are connected to depollution of noxious compounds from gaseous streams originating from industrial productions and from automobiles (de-SOx in FCC processes; treatment of emissions from spark-ignited and diesel engines), although ceria is also a key component of catalyst formulation for the dehydrogenation of ethylbenzene to styrene. Recent advances in the application of ceria for the removal of organic compound from wastewater through oxidation (catalytic wet oxidation CWO) are also reviewed. # 1999 Elsevier Science B.V. All rights reserved.