Incorporation of basic metal species with amine-containing groups into porous materials is a well-devoloped approach for achieving high uptake of greenhouse gas such as CO2. Thus, aluminium incorporated amidoxime modified mesoporous silica (Al-AOMS) materials were prepared using commercial boehmite as an alumina precursor and (3-cyanopropyl)triethoxysilane as a silica precursor in the presence of Pluronic P123 triblock copolymer. These materials were prepared by two-step process involving: (1) synthesis of mesoporous alumina with cyanopropyl groups (Al-CPMS) by co-condensation of (3-cyanopropyl)triethoxysilane and boehmite under acidic conditions followed by EISA (evaporation induced self assembly), and (2) conversion of cyanopropyl groups into amidoxime upon treatment with hydroxylamine hydrochloride under suitable conditions (80 oC, pH=8) . This work reports a successful use of the aforementioned strategy for the development of series of Al-CPMS and Al-AOMS for CO2 sorption at low (25 oC) and elevated (120 oC) temperatures. These Al-AOMS sorbents exhibited relatively high adsorption capacity at ambient conditions (25 oC, 1.2 atm) and remarkable high sorption uptake (3.84 mmol/g) at 120 oC. The thermal stability, corrosion resistivity, and chemical stability with high CO2 uptake at elevated temperatures by Al-AOMS sorbents make them a noticeable materials for CO2 sequestration.

Synthesis of mesoporous alumina with amidoxime groups for ambient and elevated temperature CO2 sorption

251st National Meeting (2016)

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