Investigation of Mg modified mesoporous silicas and their CO2 adsorption capacities |
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| Institution: | 1. ESR, Auckland, New Zealand;2. Principal Forensic Services Ltd, London, United Kingdom;3. Department of Biostatistics, University of Washington, Seattle, WA 98195-7232, USA;1. Department of Chemical Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;2. Center for Catalysis and Separations (CeCaS), Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;3. Institute of Nanoscience and Nanotechnology (INN), National Center for Scientific Research “Demokritos”, 15310 Athens, Greece;4. NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;5. Saal Operating Systems, P.O. Box 112230, Abu Dhabi, United Arab Emirates;6. Center for Membranes and Advanced Water Technology (CMAT), Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;7. Department of Chemical Engineering, University of Patras, 26500 Patras, Greece;8. Abu Dhabi Maritime Academy, Abu Dhabi Ports, P.O. Box 54477, Abu Dhabi, United Arab Emirates |
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| Abstract: | CO2 adsorption properties on Mg modified silica mesoporous materials were investigated. By using the methods of co-condensation, dispersion and ion-exchange, Mg2+ was introduced into SBA-15 and MCM-41, and transformed into MgO in the calcination process. The basic MgO can provide active sites to enhance the acidic CO2 adsorption capacity. To improve the amount and the dispersion state of the loading MgO, the optimized modification conditions were also investigated. The XRD and TEM characteristic results, as well as the CO2 adsorption performance showed that the CO2 adsorption capacity not only depended on the pore structures of MCM-41 and SBA-15, but also on the improvement of the dispersion state of MgO by modification. Among various Mg modified silica mesoporous materials, the CO2 adsorption capacity increased from 0.42 mmol g?1 of pure silica SBA-15 to 1.35 mmol g?1 of Mg–Al–SBA-15-I1 by the ion-exchange method enhanced with Al3+ synergism. Moreover, it also increased from 0.67 mmol g?1 of pure silica MCM-41 to 1.32 mmol g?1 of Mg–EDA–MCM-41-D10 by the dispersion method enhanced with the incorporation of ethane diamine. The stability test by 10 CO2 adsorption/desorption cycles showed Mg–urea–MCM-41-D10 possessed quite good recyclability. |
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