Version 1
: Received: 30 October 2024 / Approved: 31 October 2024 / Online: 31 October 2024 (16:42:22 CET)
How to cite:
Hernández-Morales, R.; Escobar, J.; Pacheco-Sosa, J. G.; Torres-Torres, J. G.; García-Zaleta, D. S.; Guerra-Que, Z.; Del Angel Vicente, P.; Barrera, M. C.; de la Cruz-Romero, D. Increasing SBA-15 Amphoteric Properties by Direct Zr Addition During Synthesis. Preprints2024, 2024102582. https://doi.org/10.20944/preprints202410.2582.v1
Hernández-Morales, R.; Escobar, J.; Pacheco-Sosa, J. G.; Torres-Torres, J. G.; García-Zaleta, D. S.; Guerra-Que, Z.; Del Angel Vicente, P.; Barrera, M. C.; de la Cruz-Romero, D. Increasing SBA-15 Amphoteric Properties by Direct Zr Addition During Synthesis. Preprints 2024, 2024102582. https://doi.org/10.20944/preprints202410.2582.v1
Hernández-Morales, R.; Escobar, J.; Pacheco-Sosa, J. G.; Torres-Torres, J. G.; García-Zaleta, D. S.; Guerra-Que, Z.; Del Angel Vicente, P.; Barrera, M. C.; de la Cruz-Romero, D. Increasing SBA-15 Amphoteric Properties by Direct Zr Addition During Synthesis. Preprints2024, 2024102582. https://doi.org/10.20944/preprints202410.2582.v1
APA Style
Hernández-Morales, R., Escobar, J., Pacheco-Sosa, J. G., Torres-Torres, J. G., García-Zaleta, D. S., Guerra-Que, Z., Del Angel Vicente, P., Barrera, M. C., & de la Cruz-Romero, D. (2024). Increasing SBA-15 Amphoteric Properties by Direct Zr Addition During Synthesis. Preprints. https://doi.org/10.20944/preprints202410.2582.v1
Chicago/Turabian Style
Hernández-Morales, R., María C. Barrera and Durvel de la Cruz-Romero. 2024 "Increasing SBA-15 Amphoteric Properties by Direct Zr Addition During Synthesis" Preprints. https://doi.org/10.20944/preprints202410.2582.v1
Abstract
Strategies followed to improve SBA-15 surface (essentially inert) included modifications by adding acidic or basic (or both) species during or after silica synthesis. Amphoteric properties are especially important as some reactions (alcohols dehydrations, for instance) require of both type of sites to efficiently take place. In this work, single Zr (nominal 3, 5 and 10 wt%, as ZrOCl2•8H2O) direct addition during SBA-15 synthesis was used to impart amphoteric characteristics (as determined by NH3 and CO2 TPD) to mesostructured SiO2 matrices. Additional materials characterization included textural (N2 physisorption) and structural (XRD, FTIR and UV-vis spectroscopies, and HRTEM as well) studies. Actual solids composition was also determined (EDS). Degree of Zr incorporation to mesoporous silica was enhanced with nominal content in binary formulations, although not necessarily integrated in SBA-15 walls forming Zr-O-Si linkages. It seemed that single ZrO2 domains (framework and extra-framework) could provide suitable amphoteric properties by significantly increasing number and strength of both acid and basic sites (especially formulation containing nominal 5 wt% Zr), as to those over mesostructured silica matrices. Also, potentially deleterious strong acid sites were avoided. The binary oxides present great potential to be applied in reactions requiring vicinal acid-basic pairs (alcohols dehydration, for instance).
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
