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Strataki, Nikoleta,Boukos, Nikolaos,Paloukis, Fotis,Neophytides, Stylianos G.,Lianos, Panagiotis Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.5
Titania nanocrystalline films have been deposited on glass slides and loaded with Pt nanoparticles by adsorption from aqueous solutions of sodium tetrachloroplatinate followed by UVA radiation or heat treatment. These metal/semiconductor combined photocatalysts have been used for photooxidation of aqueous ethanol and production of hydrogen. The efficiency of the photocatalytic process was associated with the metal load on the titania films and the size of the metal nanoparticles. Characterization of the combined photocatalyst has been made by X-ray photoelectron spectroscopy and transmission electron microscopy.
Katsiotis, Marios S.,Fardis, Michael,Al Wahedi, Yasser,Stephen, Samuel,Tzitzios, Vasilios,Boukos, Nikolaos,Kim, Hae Jin,Alhassan, Saeed M.,Papavassiliou, Georgios American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.6
<P>A nanosized HY zeolite was synthesized and studied by means of <SUP>1</SUP>H and <SUP>27</SUP>Al NMR during thermal dehydration in the temperature range 20–600 °C. The nanozeolite is comprised of a mixture of well-crystallized ultrathin platelets and octahedral nanocrystals, dressed with pentacoordinated extraframework Al<SUP>(V)</SUP>. <SUP>1</SUP>H NMR spin–lattice (<I>T</I><SUB>1</SUB>) and spin–spin (<I>T</I><SUB>2</SUB>) relaxation measurements in combination with <SUP>27</SUP>Al 3Q-MAS NMR reveal two different interaction paths between water molecules and the nanozeolite solid matrix: (i) water molecules strongly interacting with Al<SUP>(V)</SUP> cations, indicated by the high <I>T</I><SUB>1</SUB>/<I>T</I><SUB>2</SUB> ratio, and (ii) water molecules with amply smaller <I>T</I><SUB>1</SUB>/<I>T</I><SUB>2</SUB> ratio, interacting moderately with Al<SUP>(IV)</SUP> and Al<SUP>(VI)</SUP> cations. Relevant measurements on bulk HY rich in extraframework Al<SUP>(VI)</SUP> show the presence of the second relaxation channel only, indicating that the enhanced water adsorption observed for the nanozeolite originates partly from its extended surface and partly from the Al<SUP>(V)</SUP> decoration. Al<SUP>(IV)</SUP> sites in the nanozeolite appear to be highly resilient during heating, even while the framework starts to collapse and Al<SUP>(VI)</SUP> transforms to Al<SUP>(V)</SUP>. Finally, <SUP>1</SUP>H NMR shows that water protons interact particularly strongly with the Al sites in the nanozeolite at temperatures as high as 500 °C, unveiling the important role of the Al<SUP>(V)</SUP> decoration on this nanocatalyst.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-6/jp513030w/production/images/medium/jp-2014-13030w_0013.gif'></P>