An amine modified NiMgAl layered double hydroxide was synthesized via an exfoliation and grafting method. The samples were characterized by elemental analysis, X-ray diffraction, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermogravimetric analysis(TGA). Adsorption of carbon dioxide on the modified layered double hydroxide was investigated by TGA at 25-150°C. NiMgAl N2 shows a maximum CO2 adsorption capacity of 2.02 mmol·g-1 in pure CO2 and 1.89 mmol·g-1 in 15% CO2/N2 at 80°C. The optimum desorption temperature is 140°C for NiMgAl N2 according to adsorption/desorption experiments. By in-situ DRIFTS, the adsorption of CO2 on NiMgAl N2 follows the mechanism of formation of ammonium carbamate ion pairs.
|Number of pages||8|
|Journal||Huagong Xuebao/CIESC Journal|
|Publication status||Published - Feb 2013|
- Carbon dioxide
- In-situ infrared spectrometer
- Layered double hydroxide