1,721,139 research outputs found
Water at the surface: a useful tool for the evaluation of the degree of hydrophilicity or hydrophobicity of materials
No full textSynthesis of Aminopropyl-Silica Xerogels: Tuning of the Preparation Method for the Optimisation of the Catalytic Performance in the Selective Synthesis of (E)-Nitrostirenes
No full textFormation of dibutyl carbonate and butylcarbamate via CO2 insertion in titanium(IV) butoxide and reaction with n-butylamine
No full textThe species resulting from insertion of 12CO2 and 13CO2 into titanium(IV) butoxide is for the
first time fully characterized by means of infrared and nuclear magnetic resonance spectroscopy. Results show
formation of Ti-monobutylcarbonate, that easily undergoes nucleophilic attack by an aliphatic amine.
The hydrolysis of the resulting species produces butylcarbamate and dibutylcarbonate as the only main
products. Characterization results of the carbonate-like adduct, along with its reactivity with amine
molecules open the route to new ways of CO2 utilization as building block for valuable organic
compounds
Ti Ions in Mesoporous Silicas: Synthesis, Spectroscopic Characterization and Catalytic Activity
No full textSurface Structure of TiO(2) P25 Nanoparticles: Infrared Study of Hydroxy Groups on Coordinative Defect Sites
No full textAbstract: Surface hydroxy groups are known to play a significant role in the photocatalytic behavior of TiO(2). The molecular or dissociative character of H(2)O adsorption on titania is strongly affected by the local surface structure, but dissociation, producing -OH, should prevail on surface sites with a high degree of coordinative unsaturation. Here we report an IR investigation of hydroxy groups on low coordination sites of TiO(2) P25 (Degussa), a commercial titania powder considered a staple in the field of heterogeneous photocatalysis. The presence of coordinatively defective surface terminations well agrees with the roughness of the border of TiO(2) particles observed by high resolution transmission electron microscopy. Furthermore, IR spectra of adsorbed CO were used to probe the Lewis acidity of surface Ti(4+) ions exposed after the removal of water molecules and hydroxy groups. Evidence for two additional types of surface cationic sites with respect those reported in the literature was found
Structure and Spectroscopic Properties of Metallic Centres in New Micro and Mesoporous Materials: Aluminophosphates and Silicates
No full text
The (eta(6)-naphthalene)(eta(4)-cycloocta-1,5-diene)ruthenium(0) complex as precursor for homogeneous and heterogeneous catalysts in the isomerization of allyl ethers and allyl acetals to vinyl derivatives
No full textStructure-activity relationships in the partial oxidation of methane to formaldehyde on Fe-x/SiO2 catalysts
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