Abstract
This work aims to evaluate the impact of bentonite content on the structural, textural and mechanical properties of SBA-15 beads prepared by shearing using an Eirich mixer. X-Ray Diffraction analysis (XRD) of conventional and sheared SBA-15 powders and bentonite–containing beads confirms the attainment of hexagonal structure. According to the nitrogen adsorption–desorption isotherms, the bentonite content has a significant impact on mesoporous volume. SBA-15 beads containing 9.1 wt% of bentonite (B-SBA-Be9), 16.7 wt% of bentonite (B-SBA-Be17) and 33.3 wt% of bentonite (B-SBA-Be33) showed an increase in mesoporous volume of 15, 25 and 20%, respectively. Indeed, the presence of the basic bentonite-water solution during the preparation stage of the beads generates a chemical attack of the SBA-15 walls that leads to the increase in the mesopores size. Beads containing 16.7 wt% of bentonite present more promising result in relation to their good balance between textural properties and mechanical strength. Thus, this sample could be used for a future application as a catalyst support for desulfurization process. Therefore, these results confirm that porosity and mechanical resistance are strongly dependent on the bentonite content and beads preparation process, in comparison to literature data.
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Acknowledgements
The authors want to gratefully acknowledge the French Environment and Energy Management Agency (ADEME) for its financial support and Laure Michelin for the XRD analyses, which were performed on the technical platforms of IS2M (Institut de Science des Matériaux de Mulhouse).
Funding
This work was supported by the French Environment and Energy Management Agency (ADEME) through its funding program CORTEA (Project AdSOx – contract #1781C0019).
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Cesario, M., Schobing, J., Bruder, F. et al. Impact of bentonite content on the structural, textural and mechanical properties of SBA-15 mesoporous silica beads. J Porous Mater 27, 905–910 (2020). https://doi.org/10.1007/s10934-020-00865-5
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DOI: https://doi.org/10.1007/s10934-020-00865-5