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aluminum) showed an increase ranging from 24 to 37 for crystallization times of 24 to 48 h. SAR did not change further after 72 h of synthesis. This slight increase in SAR with ageing time is regularly observed for ZSM-5 synthesis as siliceous species can be continuously incorporated in the framework [20]. However higher intensities in XRD diffraction lines for 48 h were observed compared to the ones detected after a 24 h material synthesis (roughly a 15% raise based on the two theta = 23 ̋ reflexion). An optimum synthesis time has therefore to be found to guarantee a high crystallinity. Table 1. Analysis of alkaline hydrolysis solution of sugar cane bagasse. Biomass Treatment (mol/L Yield of Bagasse Mass Extract Yield NaOH) Loss (%) a (%) b 0.1 14 8 0.5 52 45 a [(initial bagasse mass ́ recovery bagasse mass)/initial bagasse mass] ˆ 100; b [mass extract/(initial bagasse mass ́ recovery bagasse mass)] ˆ 100. Table 2. ZSM-5 textural and structural properties. Catalysts Ref. [1] Ref. [2] Ref. [3] ZSM-5 A(24) ZSM-5 B(48) ZSM-5 C(72) ZSM-5 D(24) ZSM-5 E(48) ZSM-5 F(72) SAR XRF 27 26 37 107 143 153 24 81/98 * 119 Micro cm3 ̈ g ́1 0.15 n.d. n.d. 0.17 0.16 0.16 0.16 0.16 0.17 Meso cm3 ̈ g ́1 0.025 n.d. n.d. 0.018 0.017 0.018 0.017 0.017 0.017 Rel. XRD 100 100 100 88 98 97 93 106 88 Particle Size (μm) 1-3 1-3 1-3 1-3 1-4 6-10 3-7 7-8 7-11 * These two zeolites were synthesized twice to assess the reproducibility of the protocol. The textural properties of as-prepared ZSM-5 zeolites as a function of both the type of biomass derivative-solution and ageing time are presented in Table 2. The pristine MFI zeolite pattern, prepared without biomass-derivate compounds (Refs. [1,2]) were included. Firstly, it is important to highlight that all materials exhibited all the characteristic diffraction lines of a unique MFI structure (Figure 1). All zeolites were compared with (Ref. [2]) to estimate the relative crystallinity and exhibited high crystallinities, above 87%. Additional DRX experiment of ZSM-5 E (48) and a commercial ZSM-5 sample (results not shown) were performed and 228PDF Image | Zeolite Catalysis
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