caa a22 4500 463233735 CHVBK 20180405153250.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10853-006-0172-y doi (NATIONALLICENCE)springer-10.1007/s10853-006-0172-y Synthesis of ZSM-5 zeolite of improved bulk and surface properties via mixed templates [Elektronische Daten] [Mohamed Mohamed, F. Zidan, M. Fodail] Hydrothermally synthesized ZSM-5 zeolites using tetrapropyl-ammonium bromide (TPA-Br), Xylitol (Xy) and tetrapropyl-ammonium bromide+Xylitol templates; those compared with that of the parent having the same Si/Al molar ratio (64) and purchased from Mobil, were characterized with several physicochemical techniques including N2 adsorption, XRD, TG/DSC, FTIR and pyridine-FTIR. The effect of various templates on the crystallinity, crystallites size, surface properties and thermal stabilities of the produced ZSM-5 were investigated. ZSM-5 synthesized using TPA-Br+Xy; of S BET=393m2g−1, exhibited a crystallinity percentage comprises of 142% when compared with that of the parent (taken at 100% crystallinity) and measured as well a crystallites size of 61nm exceeding that derived from Xy (41nm) that measured the lowest crystallinity percentages (71%), lowest S BET (303m2g−1) and highest yield (65%) between all samples. The former sample showed high thermal stability (till 1,000°C) when compared with that derived from TPA-Br, as illustrated from TG/DSC thermograms that provided a criteria on decreasing the pore radius as a result of enclosing appreciable amounts of TPA+ and Xy inside narrow pores of ZSM-5. This sample also indicated a hydrophobic tendency when compared with that devoted from TPA-Br. Pyridine adsorption measurements showed that addition of Xy to TPA-Br stimulate the existence of basic sites in addition to acidic ones (mainly Brönsted ones) that was in the middle between that derived from Xy and TPA-Br templates. More infomations on the textural properties, morphologies, vibrational tetrahedral co-ordination T(Si or Al)-O modes and acidity were evaluated and discussed. Springer Science+Business Media, LLC, 2007 Mohamed Mohamed Chemistry Department, Faculty of Science, Benha University, Benha, Egypt aut Zidan F. Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt aut Fodail M. Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4066-4075 0022-2461 42:11<4066 2007 42 10853 https://doi.org/10.1007/s10853-006-0172-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0172-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mohamed Mohamed Chemistry Department, Faculty of Science, Benha University, Benha, Egypt aut NATIONALLICENCE 700 1- Zidan F. Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt aut NATIONALLICENCE 700 1- Fodail M. Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4066-4075 0022-2461 42:11<4066 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer