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obtained by prior alkaline sugar-cane bagasse hydrolysis, was evaluated in ZSM-5 zeolite preparations. 2. ResultsandDiscussion In order to investigate whether the alkaline hydrolyzate from sugar-cane bagasse has an influence on the chemical composition or crystal size/morphology of ZSM-5 zeolite when added as a co-component in its synthesis, we performed the following steps: i Select a reliable standard preparation based on the International Zeolite Association to obtain a high Al-containing ZSM-5 zeolite [16]. ii Repeat this procedure in the presence of biomass-derived compounds extracted by alkaline hydrolysis treatment of biomass residues. iii Characterize the as-prepared zeolites in terms of textural properties, SAR, microstructure, crystallinity and catalytic activity in the n-hexane cracking reaction. The Leuven group has recently shown by 27Al-1H REDOR NMR of precursor gel species that TPA+ cations were readily incorporated at early stages, in their final configuration, in the MFI aluminosilicate (SAR = 50) [17]. This is in agreement with earlier proposed MFI self-assembly pathways [18–20]. In order to assess any effect related to the biomass presence, we have performed preliminary experiments: zeolite synthesis without fiber addition (reference materials), and analysis of hydrolyzate composition as well as fiber compositions before and after alkaline treatment. Table 1 describes both the yield of mass loss from the bagasse, as well as the yield of the extraction. As expected, the mass loss observed after the more concentrated alkaline treatment (0.5 mol/L) is the highest. Likewise, the yield of extracted products remains the highest too (Table 1). According to former reports [21], an alkaline hydrolysis of sugar cane bagasse yielded mainly molecules from the hydrolysis of lignin, especially cinnamic acid derivatives such as coumaric and ferulic acids. The direct injection of crude hydrolyzate into a mass spectrometer equipped with an electron spray ionization source showed the main signals (M-H+) corresponding to the aforementioned acids. In parallel, the quantification of pentoses and hexoses by chromatography confirmed the absence of these carbohydrates in the hydrolyzate. However, partial hydrolysis or decomposition of these polymers cannot be completely ruled out but a more detailed analysis of this solution is not within the scope of this report. With this alkaline hydrolyzate in hand, we then proceeded to evaluate its influence in the synthesis of ZSM-5 when used as a solvent. The ZSM-5 zeolite preparation in the absence of hydrolyzate led to a highly crystalline zeolite, as shown in Table 2. The chemical analysis of SAR (including both non- and framework 227PDF Image | Zeolite Catalysis
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