02206nas a2200265   4500008004100000022001400041245009500055210006900150260010600219300001400325490000700339520123800346653001901584653001801603653001601621653002001637653002201657100002801679700001701707700002201724700002601746700001801772700002401790856012601814       2010                        eng d  a0360-319900aInfluence of zeolitic structure on photoreduction property and hydrogen evolution reaction0 aInfluence of zeolitic structure on photoreduction property and h  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAR  a1911-19200 v353 a<p>A new photocatalytic material developed by supporting TiO(2) in combination with transition metal ion like cobalt and heteropolyacid (HPA) on the surface is facilitating enhanced photoreduction of water and methyl orange Zeolites being a solid acid play an important role in the electron transfer reaction, facilitated by the Lewis acid sites in the form of aluminium ions In the present work, four different zeolite matrices namely, NaY zeolite, ultrastable zeolite Y, beta zeolite and titanium silicate-1 have been used for the synthesis of new photocatalytic materials These materials have been evaluated for water splitting by an initial screening procedure using methyl orange photoreduction The photocatalyst containing Na Y has emerged as a potential photocatalyst with hydrogen evolution rate of 2730 mu mol/h/g of TiO(2) Hydrogen evolution was not observed for the composite photocatalysts synthesized using the other zeolite matrices It has been observed that physicochemical properties like Si/Al ratio, acidity and basicity of the zeolite support have a tremendous influence on the photoreduction property of these zeolite matrices (C) 2010 Professor T Nejat Veziroglu Published by Elsevier Ltd All rights reserved</p>10aH(2) evolution10aLewis acidity10aSi/Al ratio10awater splitting10aZeolite structure1 aChatti, Ravikrishna, V.1 aDubey, Nidhi1 aJoshi, Meenal, V.1 aLabhsetwar, Nitin, K.1 aJoshi, P., N.1 aRayalu, Sadhana, S.  uhttps://library.ncl.res.in/content/influence-zeolitic-structure-photoreduction-property-and-hydrogen-evolution-reaction-001572nas a2200229   4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520073000341653001801071653002701089653002601116653001101142653000801153100002201161700001801183700001801201856012301219       2011                        eng d  a1387-181100aCharacterization of surface acid sites in tin-silicalite-1 (Sn-MFI) molecular sieve by X-ray photoelectron spectroscopy0 aCharacterization of surface acid sites in tinsilicalite1 SnMFI m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a236-2400 v1413 a<p>The nature, strength and density of surface acid sites in Sn-MFI molecular sieves with different Sn-content were characterized by N 1s high resolution photoelectron peak of chemisorbed pyridine in combination with pyridine-IR and TPAD. Two peaks emerged at 399.5 +/- 0.2 and 401.5 +/- 0.2 eV by deconvoluting composite N is peak were assigned to chemisorbed pyridine on weak and relatively strong Lewis acid sites, respectively. The relative percentage of strong Lewis acid sites was found to increase with the decrease of framework Sn content. A close agreement was observed between the ratios of weak Lewis acid sites to strong Lewis acid sites obtained from XPS and TPAD. (C) 2010 Elsevier Inc. All rights reserved.</p>10aLewis acidity10aPyridine chemisorption10aSiO2/SnO2 molar ratio10aSn-MFI10aXPS1 aNiphadkar, P., S.1 aPatil, K., R.1 aJoshi, P., N.  uhttps://library.ncl.res.in/content/characterization-surface-acid-sites-tin-silicalite-1-sn-mfi-molecular-sieve-x-ray-0