Effect of ceria/surfactant molar ratios on the formation of mesoporous ceria nanoparticles and its application in CO2 capture
Keywords:Mesoporous ceria nanoparticle, CO2 adsorption, hydrothermal
Large quantities of carbon dioxide (CO2) in a mixture of natural gas/CO2 can reduce the heating value of the mixture, reducing the thermal efficiency of a gas engine. Therefore, CO2 should be separated from the natural gas. CO2 separation through adsorption method has several advantages, such as high energy efficiency, easy operation, low cost, and availability of different adsorbents. There is a need to develop adsorbents with a porous structure. Several reaction parameters influence the synthesis of porous adsorbents, including temperature, solvent, stirring rates, co-surfactant, pH, and metal to surfactant molar ratio. In this study, the effect of varying ceria to surfactant molar ratio on the synthesis of mesoporous ceria nanoparticles (MCNs) was investigated for CO2 adsorption. Using cetyltrimethylammonium bromide (CTAB) as a surfactant agent, MCNs were prepared by varying ceria to CTAB molar ratio (0.5, 1.0, 1.5, and 2.0) via a simple hydrothermal method. All the MCN samples showed a bimodal mesoporous structure around 18â€“30 nm with pore sizes of 3.7 nm. Thermogravimetric analysis showed that the MCNs had weight loss of < 5% when heated up to 1173 K, indicating high thermal stability. MCN-1.0 showed the highest CO2 adsorption at 0.37 mmol/g, followed by MCN-1.5 and MCN-2.0 at 1 bar and 298 K. We believe that this study will expand the knowledge of ceria material properties towards CO2 adsorption and will be useful in material selection for industrial CO2 capture.
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