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Citation: ZHAO Hui-Ling, HU Jun, WANG Jian-Jun, ZHOU Li-Hui, LIU Hong-Lai. CO₂ Capture by the Amine-modified Mesoporous Materials[J]. Acta Physico-Chimica Sinica, ;2007, 23(06): 801-806. doi: 10.1016/S1872-1508(07)60046-1 shu

CO₂ Capture by the Amine-modified Mesoporous Materials

1.
Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 15 December 2006
Available Online: 27 April 2007

Novel CO2 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 29Si nuclear magnetic resonance (NMR), Fourier transforminfrared (FT-IR) spectra, and measurements of N2 adsorption and desorption isothermal, which confirmed that aminosilanes 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-β-(aminoethyl)-γ-aminopropyl dimethoxy methylsilane) modification (p =101 kPa) at room temperature. The studies of the mechanism of CO2 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.
- MCM-41; SBA-15; Amine surface modification; Adsorption; CO2
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沈阳化工大学材料科学与工程学院沈阳 110142

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CO₂ Capture by the Amine-modified Mesoporous Materials