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Microwave-synthesized high-performance mesoporous SBA-15 silica materials for CO2 capture.
- Source :
- Korean Journal of Chemical Engineering; Jan2018, Vol. 37 Issue 11, p1951-1962, 12p
- Publication Year :
- 2018
-
Abstract
- Microwave-assisted post-synthetic detemplating method was applied to remove successfully the occluded organic template from the mesoporous silica frameworks of as-synthesized SBA-15 within a short period of time compared to a conventional method, such as furnace calcination. The nitrogen adsorption/desorption isotherm studies showed that the resultant detemplated SBA-15 had a very high specific surface area of 1,271 m<superscript>2</superscript>/g, large pore size of 9.21 nm and high pore volume of 2.10 cm<superscript>3</superscript>/g; while the powder X-ray diffraction patterns and high-resolution TEM images of these support materials revealed the presence of highly ordered mesopores without any structural shrinkage. Both the microwave power and time during post-synthetic microwave irradiation were found to influence the morphological structure of the SBA-15 support. To evaluate the adsorption performance of the microwave-irradiated SBA-15 support, CO<subscript>2</subscript> adsorption uptake was measured after functionalizing it with different loadings of polyethyleneimine (PEI) under 9.7% CO<subscript>2</subscript>/N<subscript>2</subscript> mixture at 75<superscript>o</superscript>C. The maximum CO<subscript>2</subscript> uptake was 3.63 mmol CO<subscript>2</subscript>/g (0.16 g/g), with an optimum PEI loading of 70 wt%. Because of the significant improvement in structural characteristics, the microwave-irradiated SBA-15 supports facilitated more PEI incorporation that contributed to about 15% higher CO<subscript>2</subscript> uptake than that of conventional furnace calcined one. In addition, the sorbent demonstrated very good cyclic stability when tested over 25 cycles and for a total duration of 20 h in humid conditions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02561115
- Volume :
- 37
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Korean Journal of Chemical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 147225879
- Full Text :
- https://doi.org/10.1007/s11814-020-0596-0