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REF.1 REF.2 ZSM-5 A(24) (Pnma space group) when high thermal treatment is conducted [24,25], usually resulting in prismatic crystal formation [26] as observed for reference zeolites (Figure 2). The standard method used for preparing ZSM-5 zeolite resulted in 1-3 μm range crystal size with no changes in morphologyZSwMith-5aCge(7in2g) time. In contrast, both morphology and particle size were affected by the presence of biomass derived-compounds. The extract obtained at 0.1 mol/L led to regular (size and type) ZSM-5 crystals at an ageing time of 24 h. A further raise in ageing time to 48 h led to the formation of crystals having the same size, but extremely different in terms of morphology that was constructed by an assembly of elongated French-fries having 100 nm in width. At longer ageing times, larger crystals were formed, exhibiting again a conventional morphology. In contrast to ZSM-5 A(24) sample, ZSM-5 C(72) sample exhibits sharper crystal ou2ter riTmhanedtappears to be more faceted. While studying the influence of alkali cation nature and gel ionic strength, Petrik et al. were Figure 1. Diffraction patterns for the different zeolites: Ref. [1] series and Ref. [2]. series able to synthesize MFI zeolites with significant changes in morphology and drawn Zeolite synthesized for 24 h; NaOH 0.1 mol/L (ZSM‐5 A(24)); for 48 h; NaOH 0.1 mol/L the conclusion that minor alterations of the composition may lead to major changes (ZSM‐5 B(48)); for 72 h NaOH 0.1 mol/L (ZSM‐5 C(72)); for 24 h; NaOH 0.5 mol/L (ZSM‐5 in the crystal growth [27]. D(24)); for 48 h; NaOH 0.5 mol/L (ZSM‐5 E(48)); for 72 h; NaOH 0.5 mol/L (ZSM‐5 F(72)). FFigiguurree21. .Coonntt.. 230 ZSM-5 B(48) ZSM-5 D(24) ZSM-5 E(48) ZSM-5 F(72) 30PDF Image | Zeolite Catalysis
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