Influence of preparation parameters on the structural properties and the CO2 capture performance of Mg–Zr solid sorbent

• Mesoporous Mg–Zr sample is prepared by surfactant assisted co-precipitation method.
• Mg2+ is introduced into the ZrO2 lattice and formed new MgOZr basic sites.
• The Mg–Zr sample exhibits high surface area and abundant basic sites.
• The relationship between CO2 capture behavior and structure of sample is discussed.
• The CO2 uptake is determined by both surface area and amount of basic sites.

A series of mesoporous Mg–Zr solid solutions were prepared by surfactant assisted co-precipitation method under different conditions. The effects of preparation parameters on the structural properties and the CO2 capture performance of the samples were investigated. The results indicated that the optimum preparation parameters included a precipitating agent of NaOH, a calcination temperature of 600 °C and a refluxing time of 48 h. The Mg–Zr samples under the optimum preparation conditions exhibited high thermal stability, high specific surface area (269 cm2/g) and abundant basic sites (0.94 mmol/g). The advantages of these structural properties of the samples greatly facilitated CO2 adsorption, and the CO2 adsorption capacity of the sample reached a maximum of 1.28 mmol/g under the optimum conditions.

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