文献类型：期刊文献

英文题名：CO₂ capture by the amine-modified mesoporous materials

作者：Zhao Hui-Ling; Hu Jun; Wang Jian-Jun; Zhou Li-Hui; Liu Hong-Lai

机构：[1]E China Univ Sci & Technol, Dept Chem, Adv Mat Lab, Shanghai 200237, Peoples R China

年份：2007

卷号：23

期号：6

起止页码：801

外文期刊名：ACTA PHYSICO-CHIMICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000247405800002)】；

语种：英文

外文关键词：MCM-41; SBA-15; amine surface modification; adsorption; CO2

摘要：Novel CO, adsorbents were prepared by grafting of two different aminosilanes on mesoporous silica MCM-41 and SBA-15. The properties of the mesoporous materials before and after surface modification were investigated by powder X-ray diffraction (XRD) pattern, solid-state Si-29 nuclear magnetic resonance (NMR), Fourier transform infrared (FT-IR) spectra, and measurements of N-2 adsorption and desorption isothermal, which confirmed that ammosilanes were grafted on the surface of the channels in the mesoporous materials. Thermogravimetry analysis (TGA) evaluated the amounts of grafted amine to be about 1.5-2.9 mmol . g(-1). The CO2 adsorption capacities of MCM-41 increased from 0.67 mmol . g(-1) to 2.20 mmol . g(-1) after AEAPMDS (N-beta-(aminoethyl)-gamma-aminopropyl dimethoxy methylsilane) modification (p =101 kPa) at room temperature. The studies of the mechanism of CO, adsorption suggested that there were two main contributions for the increase: the chemical adsorption based on the active sites of amine groups and the capillary condensation caused by the nano-scale channels of the mesoporous materials.