The application of fine TiO2 particles for enhanced gas absorption Dagaonkar, M.V.; Heeres, H.J.; Beenackers, A.A C M; Pangarkar, V.G. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
AbstractThe physical absorption of pure CO 2 in various liquids (water, hexadecane, and sunflower oil) containing micron sized TiO 2 particles has been investigated. Absorption studies were carried out in a batch stirred cell reactor at 298 K and initial pressures of 0.08 MPa. Solid loading and stirring intensities were varied systematically between 0-15 kg/m 3 and 3.3-12.5 s −1 , respectively. Gas absorption rates are enhanced significantly in the presence of TiO 2 particles. Enhancement factors are a function of the solids loading and stirring intensity. Maximum enhancement factors of about 2 were observed for all solvents at low stirring intensities. The rate of gas absorption was theoretically analyzed using a heterogeneous unsteady state mass transfer model based on the Danckwerts surface renewal theory and a Langmuir-type of particle to interface adhesion isotherm. This model not only predicts the trends in the observed enhancement factors very well but also gives an accurate quantitative picture.
Synthesis of CaCO3 nanoparticles by carbonation of lime solutions in reverse micellar systems Heeres, Hero; Jain, R.; Mehra, A.; Dagaonkar, M.V. pplication of reverse micelles for the synthesis of nano-sized calcium carbonate particles in different solvents (cyclohexane, decane and heptane) has been investigated. The effect of the mole ratio of water-to-surfactant (R) and type of solvent has been studied on the size and nature of the carbonate particles. The results indicate that an increase in water-to-surfactant ratio results in a larger particle size.
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