文献类型：期刊文献

英文题名：Investigation of Mg modified mesoporous silicas and their CO₂ adsorption capacities

作者：Zhao, Huiling;Yan, Wei;Bian, Zijun;Hu, Jun[1];Liu, Honglai

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2012

卷号：14

期号：2

起止页码：250

外文期刊名：SOLID STATE SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000300651600009)】；

基金：Financial support for this work was provided by the National High Technology Research and Development Program of China (No. 2008AA062302), the National Natural Science Foundation of China (No. 20776045, 20736002) and the Cheung Kong Scholars Innovation Programme (No. IRT0721).

语种：英文

外文关键词：Mg modification; Mesoporous silica; Dispersion state of MgO; CO2 adsorption

摘要：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. (C) 2011 Elsevier Masson SAS. All rights reserved.