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Journal of Materials Science

, Volume 42, Issue 11, pp 4066–4075 | Cite as

Synthesis of ZSM-5 zeolite of improved bulk and surface properties via mixed templates

  • Mohamed Mokhtar MohamedEmail author
  • F. I. Zidan
  • M. H. Fodail
Article

Abstract

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 SBET = 393 m2 g−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 61 nm exceeding that derived from Xy (41 nm) that measured the lowest crystallinity percentages (71%), lowest SBET (303 m2 g−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.

Keywords

Zeolite Xylitol Silicic Acid Basic Site External Surface Area 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Mohamed Mokhtar Mohamed
    • 1
    Email author
  • F. I. Zidan
    • 2
  • M. H. Fodail
    • 2
  1. 1.Chemistry Department, Faculty of ScienceBenha UniversityBenhaEgypt
  2. 2.Chemistry Department, Faculty of ScienceAl-Azhar UniversityNasr City, CairoEgypt

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