The interplay between acid-base properties and Fermi level pinning of a nano dispersed tungsten oxide - titania catalytic system.

A series of WO/TiO catalysts were synthesized, characterized, and evaluated for the NO selective catalytic reduction (SCR) with NH. Based on a wide range of characterization techniques, a detailed model was developed that describes the interfacial electron transfer between WO and TiO and defines a relationship between the acid-base properties of the catalytic surface and electronic structure modification. The electronic interactions at the WO/TiO interface were quantified using variations in the system's electronic structure.

Mechanistic aspects of the ethanol steam reforming reaction for hydrogen production on Pt, Ni, and PtNi catalysts supported on gamma-Al2O3.

Mechanistic aspects of ethanol steam reforming on Pt, Ni, and PtNi catalysts supported on gamma-Al(2)O(3) are investigated from the analysis of adsorbed species and gas phase products formed on catalysts during temperature-programmed desorption of ethanol and during ethanol steam reforming reaction. DRIFTS-MS analyses of ethanol decomposition and ethanol steam reforming reactions show that PtNi and Ni catalysts are more stable than the Pt monometallic counterpart. Ethanol TPD results on Ni, Pt, and NiPt catalysts point to ethanol dehydrogenation and acetaldehyde decomposition as the first reaction pathways of ethanol steam reforming over the studied catalysts.

Adsorption of Acid Orange 7 on the surface of titanium dioxide.

The adsorption of a model textile azo-dye, Acid Orange 7 (AO7), on the surface of titanium dioxide was extensively investigated in aqueous TiO(2) suspensions over wide ranges of AO7 concentrations (1 x 10(-4)-3 x 10(-3) M) and pH values (2-10). Results obtained with the use of a variety of techniques, including potentiometric titrations, adsorption isotherms, adsorption edges, and microelectrophoresis, were used for the description of the "AO7 solution/TiO(2) surface" interface. This has been achieved by taking into account the effects of pH on the speciation of the dye in solution and on the nature and population of the surface groups of TiO(2).