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Synthesis of Spherical Mgo Aggregates Via Water-in-Oil Method and its High Performance for Pre-Combustion Co2 Capture

Since vast emissions of CO2 from increasing fossil-fuel consumption have resulted in increased CO2 concentration, the capture and sequestration of CO2 (CCS) is urgently required. Among various capture techniques, pre-combustion capture is a recognized carbon capture technique with the advantage of simultaneous generation of various products, from electricity to hydrogen. [1] In an integrated gasification combined cycle (IGCC) process which is a promising power generation technology, a gasifier converts coal into syngas which consists of CO, CO2, and H2, and syngas is supplied to a water gas shift reactor (WGSR) in the range of 350-550 °C. If advanced sorbents can efficiently capture CO2 and be regenerated at the intermediate temperature range, a heat network of the process can be integrated effectively than post-combustion capture because no gas cooling step is required. Magnesium oxide (MgO) can capture CO2 at the intermediate temperature by forming magnesium carbonate (MgCO3) at the intermediate temperature range. [2] There has been enormous attention to improving the sorption capacity and rate by applying molten salt promoters at the intermediate temperature. Nevertheless, for the ultimate industrial application for CO2 capture, MgObased sorbents are required to possess high and consistent working capacity along the repeated cycles. In spite of the enhanced performance from various reports, the powder MgO is not appropriate to be directly utilized for a practical process because of the pressure drop which can cause a difficulty in operating and achieving high productivity and purity in the pressure swing adsorption process (PSA). [3] Furthermore, pelletized sorbents are required for the application of a fluidized-bed process for CO2 capture. On the other hand, palletization with additive binders can typically lead to decreasing performance due to the reduced active sites and surface area. In the study, the spherical MgO aggregates with the diameter of around 400 μm were synthesized via the water-in-oil method. To coat the alkali metal salts into the spherical MgO