High temperature CO2 separation is effective for the efficient CO2 reduction. Li4SiO4 is one of the high temperature CO2 adsorbents. In this study, a Li4SiO 4 thin membrane was developed by using a novel solid state conversion method. Li4SiO4 membranes were successfully prepared on a porous alumina substrate at 600 °C conversion from mesoporous silica as silica source. Mesoporous silica was better silica source to obtain Li 4SiO4 at the low temperature conversion method compared with MFI zeolite, fumed silica and colloidal silica. CO2/N 2 permselectivity was 0.85 at 600 °C that is higher than the Knudsen diffusion difference. Thus, Li4SiO4 layer showed CO2 permselectivity at 600 °C. It was important to use the mixtures of Li2CO3 and K2CO3 to fill the pinholes of the Li4SiO4 membrane. N2 permeance through the Li4SiO4 membrane decreased to 1.8 × 10-9 mol m-2 s-1 Pa-1 from 3.9 × 10-7 mol m-2 s-1 Pa-1 by the addition of the mixtures of Li2CO3 and K 2CO3.
|Number of pages||8|
|Publication status||Published - 2013 Jan 1|
|Event||11th International Conference on Greenhouse Gas Control Technologies, GHGT 2012 - Kyoto, Japan|
Duration: 2012 Nov 18 → 2012 Nov 22
- Mesoporous silica
ASJC Scopus subject areas