Abstract
Abstract Mesoporous MgO-TiO 2 sorbents denoted as (xMgO-TiO 2 ) with different Mg/Ti molar ratios were synthesized by single step evaporation-induced self-assemble (EISA) method for its application to CO 2 capture. The effect of Mg/Ti molar ratio of mesoporous MgO-TiO 2 sorbents on their physicochemical properties, oxidation state of titanium, and CO 2 adsorption performance was investigated. The phase of xMgO-TiO 2 was transformed in the sequence of MgTiO 3 (Mg/Ti = 1.0 and 2.0) → MgO-MgTi 2 O 4 (Mg/Ti = 3.0 and 4.0) → MgO-Mg 2 TiO 4 (Mg/Ti = 5.0). However, with the increasing Mg/Ti molar ratio, CO 2 adsorption performance increased in the order of MgTiO 3 2 O 4 2 TiO 4 . Among the sorbents tested 3.0MgO-TiO 2 showed the best CO 2 adsorption performance corresponding to ∼1 mmol/g (4.39 wt.%). It was observed that the MgTi 2 O 4 (Ti 3+ -O-Mg 2+ ) could create highly basic sites compared to MgTiO 3 and Mg 2 TiO 4 . In the process of CO 2 adsorption, high surface area (111.4 m 2 /g), large pore volume (0.45 cm 3 /g) as well as appropriate basic sites of Mg-O-Ti make it a plausible candidate for CO 2 adsorption.
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