oa High-pressure CO2 Adsorption on Conventional Hydroxyl Metal Carbonates

Carbon dioxide (CO2) adsorption capacities of several hydroxy metal carbonates have been studied using the state-of-the-art RubothermR Sorption apparatus to obtain adsorption and desorption isotherms of these compounds up to 175 bar. The carbonate compounds were prepared by simply reacting a carbonate (CO3 ²⁻) solution with solutions of Zn²⁺, Zn²⁺/Mg²⁺, Mg²⁺, Cu²⁺/Mg²⁺, Cu²⁺, Pb²⁺, and Ni²⁺ metal ions resulting in hydroxyzincite, hydromagnesite, mcguinnessite, malachite, nullaginite, and hydrocerussite, respectively. Mineral compositions are calculated by using a combination of powder XRD, TGA, FTIR, and ICP-OES analysis. Adsorption capacity of hydroxy nickel carbonate compound obtained from RubothermR Magnetic Suspension Sorption apparatus has shown highest performance among the other components that were investigated in this work (1.72 mmole CO2/gram adsorbent at 175 bar and 316 K).