Silica nanotubes (SNT), silica nanospheres (SNS), and aminopropyl modified silica nanotubes (AP-SNT) and nanospheres (AP-SNS) were prepared in the presence of F127 block co-polymer. Soft-templating method was used to synthesize silica nanotubes and nanospheres and post grafting technique was used to introduce aminopropyl functional groups in to the surface of silica nanotubes and nanospheres. Micropore volume of samples studied shown to be beneficial for CO2 physisorption at low pressures and temperature. In contrast, basic amine-groups are introduced into porous materials to achieve high CO2 uptake at elevated temperature via chemisorption mechanism. The resulting composite mesostructures were used for CO2 capture at ambient (25 oC) and elevated (120 oC) temperatures. The maximum CO2 uptakes obtained at 1.2 atm and 25 oC for SNT, SNS, AP-SNT, and AP-SNS samples are 2.81, 2.06, 2.35, and 1.54 mmol/g, respectively. These sorbents further showed remarkably high sorption uptake (0.91-2.87 mmol/g) at 120 oC. High microporosity, surface area, and aminopropyl loading of the SNT and SNS samples make these materials suitable for CO2 sorption at ambient and elevated temperatures.

High temperature co2 sorption using amine modified silica nanotubes and nanospheres

251st National Meeting (2016)

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