25 research outputs found
Dura Lex" Aritculo politico, comentario sobre el asesinato de Alvaro ObregoĢn en el restaurante "La Bombilla
No full text4 pp
Circulor del acuerdo Presidencial por el cul se adopta el sistima de usos hororios (hora Mexico, Hora Yucatan) con base en las obligociones mtirnocionales? Controidos pro Mexico
No full text2 pp
Constituciones y Regla de la Minima Congregacion de los Hermanos enfermeros pobres
No full textA 150/04
Improving the Catalytic Performance of (<i>S</i>)āProline as Organocatalyst in Asymmetric Aldol Reactions in the Presence of Solvate Ionic Liquids: Involvement of a Supramolecular Aggregate
No full textFor
the first time, a highly efficient and stereoselective asymmetric
aldol reaction employing (<i>S</i>)-proline in the presence
of solvate ionic liquids is reported. The reaction seems to proceed
via a supramolecular aggregate of (<i>S</i>)-proline, the
solvate ionic liquid, and water, affording high yields and excellent
stereoselectivities with low catalyst loadings
Active Site Considerations on the Photocatalytic H<sub>2</sub> Evolution Performance of Cu-Doped TiO<sub>2</sub> Obtained by Different Doping Methods
No full textA photocatalytic H<sub>2</sub> evolution
reaction was performed
over copper doped TiO<sub>2</sub>. The influence of sulfate pretreatment
over fresh TiO<sub>2</sub> support and the Cu doping method has been
evaluated. Wide structural and surface characterization of catalysts
was carried out in order to establish a correlation between the effect
of sulfuric acid treatment and the further Cu-TiO<sub>2</sub> photocatalytic
properties. Notably a different copper dispersion and oxidation state
is obtained by different metal decoration methods. From the structural
and surface analysis of the catalysts we have stated that the occurrence
of highly disperse and reducible Cu<sup>2+</sup> species is directly
related to the photocatalytic activity for the H<sub>2</sub> production
reaction. Highly active materials have been obtained from a chemical
reduction method leading to 18 mmolĀ·h<sup>ā1</sup>Ā·g<sup>ā1</sup> for 3 mol % copper loading
