(397b) Effect of Different Epoxy Modifiers Applied to Amine – Silica Adsorbents for CO2 Capture

Recently, carbon dioxide (CO₂), one of the greenhouse gases that absorb radiant heat from the earth's surface and increase the atmospheric temperature, is produced from various industrial sectors. CO₂ is the major cause of global warming due to its large emitted amount and the carbon capture and storage (CCS) technology has attracted attention to curb the release of CO₂. The CCS technology can be broadly divided into three categories: capture, transport, and storage. From an economic point of view, it is important to develop effective capture technology because the capture occupies more than 80% of the total cost. CO₂ capture technology can be largely classified into absorption, membrane separation, and adsorption. Among them, adsorption has advantages of a relatively low operating cost and continuous CO₂ separation without byproducts. However, adsorption has main drawback of low CO₂ selectivity over N₂. In this study, we developed adsorbents having improved CO₂/N₂ selectivity and CO₂ adsorption performance by functionalizing amines on the silica support. Furthermore, the instability at high temperature during regeneration, a disadvantage of existing amine-based adsorbents, was compensated by transforming the amine structure using different epoxy-modifiers. The CO₂ adsorption performance of the adsorbents was evaluated by thermogravimetric analysis (TGA), and the surface characteristics and structure of the adsorbents were examined by N₂ adsorption analysis, Fourier transform infrared spectroscopy (FT-IR), and ¹³C-nuclear magnetic resonance (NMR) spectroscopy.