Journal
CHEMICAL ENGINEERING JOURNAL
Volume 337, Issue -, Pages 342-350Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.12.109
Keywords
CO2 adsorption; SiO2 nanowires; Sepiolite mineral; TEPA; Structural modification
Categories
Funding
- National Natural Science Fund of China [51774331, 51304242, 51374250]
- National Science Fund for Distinguished Young Scholars [51225403]
- Natural Science Fund of Hunan Province [2017JJ0351]
- Innovation Driven Plan of Central South University [2016CX015]
- ShengHua Scholar Project of CSU [20160201]
- Strategic Priority Research Program of Central South University [ZLXD2017005]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130162120011]
- Hunan Provincial Co-Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources
- Funds for Hunan Provincial Natural Science Foundation for Innovative Research Groups [[2013] 2]
- Foundation of Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province [HPK201501]
- US Department of Energy, Office of Basic Energy Sciences, Division of Chemical, Biological and Geological Sciences [DE-FG02-86ER13622.A000]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts436, 2017zzts668, 2017zzts583]
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To understand the effect of porous parameters and chemical components on CO2 capturing performance of solid state amine absorbents and their kinetic parameters, a clay mineral-based CO2 absorbent was prepared by impregnating five different liquid amines onto SiO2 nanowire clusters from fibrous sepiolite (Sep). Characterization was conducted by XRD, SEM, FTIR, and N-2 adsorption-desorption isotherm, CO2 adsorption performances were measured by TGA. After acid treatment, the raw Sep mineral changed into amorphous silica nanowires, and the largest S-BET of the obtained SiO2 nanowires reached 320 m(2)/g, which was 8 times larger than the pristine mineral. Amongst the adapted amines, tetraethylenepentamine (TEPA) showed superiority in the CO2 adsorption capacity. The optimized adsorption capacity reached 3.7 mmol/g at 75 degrees C from a CO2 + N-2 mixture on a similar to 50 wt % TEPA loaded SiO2 sample, and the capacity remained 3.6 mmol/g after ten circles of adsorption/desorption tests. The pore size and pore structure of the matrix, rather than the surface area, will obviously affect the adsorption ability of the product. Kinetic parameters for the CO2 adsorption process fitted well with a fractional-order model, confirming that the CO2 adsorption process by the solid absorbent should be a combination of both physical and chemical reactions. Results in this article provide detailed parameters for preparing and understanding these clay mineral based solid state CO2 absorbents.
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