Abstract
Carbon dioxide capture and storage (CCS) technologies have attracted a great deal of attention as effective measures to prevent global warming. Adsorption methods using porous materials seem to have several advantages over the liquid absorption methods. In this study, we have developed a synthesis method of new amorphous titanium dioxide (TiO2) nanoparticles with a diameter of 3 nm, a high surface area of 617 m2/g and a large amount of OH groups. Next, the surface of the amorphous TiO2 nanoparticles was modified using ethylenediamine to examine whether CO2 adsorption increases. Amorphous TiO2 nanoparticles were successfully modified with ethylenediamine, which was used in excess due to the presence of a large amount of hydroxyl groups. The amorphous TiO2 nanoparticles modified with ethylenediamine show a higher CO2 adsorption capacity (65 cm3/g at 0 °C, 100 kPa) than conventional TiO2 and mesoporous SiO2. We discuss the origin of the higher CO2 adsorption capacity in terms of the high specific surface area of the amorphous TiO2 nanoparticles and the modification with ethylenediamine on the surface of the amorphous TiO2 nanoparticles. The optimization of the amount of ethylenediamine bound on the particles increased the CO2 adsorption capacity without pore blocking.
Highlights
Carbon dioxide capture and storage (CCS) technologies have been well studied over the last decade to decrease CO2 emission in the atmosphere which might contribute to global warming
The amorphous TiO2 nanoparticles were synthesized by using THF as a solvent in hydrolysis reaction of TTIP
Our amorphous TiO2 nanoparticles were modified by ethylenediamine
Summary
Carbon dioxide capture and storage (CCS) technologies have been well studied over the last decade to decrease CO2 emission in the atmosphere which might contribute to global warming. Various CCS methods including solvent absorption, membrane separation, cryogenics fractionation and adsorption using solid adsorbents have been proposed and developed so far [1–4]. A liquid phase absorption method using amine (e.g., monoethanolamine) solution has been put into practical use [5]. This process has several problems such as corrosion of equipment, degradation of the solution, and, in addition, it requires heat regeneration. Adsorption methods using solid porous materials have attracted more attention over the liquid method [4]. The adsorption process has higher cycle stability and does not cause corrosion of equipment. The adsorption process by using pressure differences is of advantage to the reduction of energy consumption for CO2 regeneration
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