465008 Synthesis of Sodium Promoted Hydrotalcite and Its CO2 Adsorption Properties at High Temperature

Tuesday, November 15, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Suji Kim and Ki Bong Lee, Department of Chemical & Biological Engineering, Korea University, Seoul, Korea, The Republic of

In the past centuries, global warming has been seriously accelerated since carbon dioxide (CO2) emission caused by fossil fuel-based energy system has been gradually increasing. In this respect, CO2 is classified into a main anthropogenic greenhouse gas so that the increase of CO2 concentration in the atmosphere must be inhibited. To diminish CO2 emission, lots of researches have been carried out. Among various CO2 capture technologies, CO2 can be directly captured using solid sorbent materials. Layered double hydroxide, also called as hydrotalcite, has been considered as a promising for CO2 capture at high temperature range (200-500 °C). Hydrotalcite typically has fast adsorption and desorption kinetics, thermal stability, and ease of regeneration by pressure or temperature swing adsorption method. However, its low CO2 adsorption capacity should be enhanced for practical sorption processes. Alkali metal precursors, usually potassium carbonate (K2CO3), are used for enhancing the CO2 adsorption capacity of the hydrotalcite since alkali metal increases the basicity of hydrotalcite. However, as an alkali metal precursor, sodium nitrate (NaNO3) has not been studied in previous studies. Therefore, in this study, NaNO3-promoted hydrotalcite was synthesized and the effect of NaNO3 on CO2 adsorption properties of hydrotalcite was investigated using several analysis methods. The structural and textural properties were analyzed using X-ray diffraction (XRD) and N2 adsorption analysis, and the CO2 adsorption ability at high-temperature (200-400 °C) was measured using a thermogravimetric analyzer (TGA).

Extended Abstract: File Not Uploaded