[en] In this work, we studied the formation of hierarchical porous cartridges by means of bacterial cellulose impregnation with the zeolites A and X. Cellulose was successfully produced by Komagataeibacter genus and the zeolites were obtained by hydrothermal route. The composites were formed using both oxidized and non-oxidized cellulose. Different characterization techniques were used to analyze the resulting materials like powder X-ray diffraction, spectroscopic techniques (infrared vibrational spectroscopy and nuclear magnetic resonance), electron microscopy, thermal analyses, as well as ionic exchange experiments. The results show that the composites present layers with large voids among them, formed by cellulose nanofibrils tangling the particles in the oxidized samples, and shiftings in the bands referent to the carboxilyc groups and hydrogen bondings. The oxidation step for the cellulose seems to be important for the hierarchization and a positive effect on the cartridges is found for Ca²⁺ ionic exchange tests. Thus, these components can be successfully mixed to form cartridges with potential use at gas and liquid adsorption technologies. (author)

[en] In this work, KIT-6 silica functionalized with sulfonic acid by the co-condensation method was prepared and evaluated as a catalyst in the transesterification of Brazilian cashew nut oil (BCNO) with butanol for biodiesel synthesis. The catalyst was characterized by SAXS, TEM, N₂ adsorption–desorption measurements, ²⁹Si MAS NMR and ¹³C CP-MAS NMR to prove the structural integrity of the incorporated organic group and to show the ordered structure, morphology and porosity, respectively. Small-angle XRD confirmed the formation of the mesophase of the synthesized materials. TEM images demonstrated the well-ordered arrangement of the pores and their uniformity throughout the grains, in addition to the highly ordered nature of the cubic mesostructures. The KIT-6 propylsulfonic acid catalyst was able to produce a 70% butyl ester yield, as determined by ¹H NMR spectroscopy in 6 h reaction with a BuOH/BCNO molar ratio of 30:1, 140 °C and a 6 wt% of catalyst mass relative to starting oil mass in the reaction. The KIT-6-S catalyst can be reused for two cycles without loss of catalytic activity. (author)

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