Nano-TiO2 promoted CaO-based high-temperature CO2 sorbent: influence of crystal level properties on the CO2 sorption efficiency
Literature Information
Sanat Chandra Maiti, Chinmay Ghoroi
This work investigates the multi-cycle CO2 sorption and the kinetics of the carbonation reaction of nano-TiO2 promoted CaO synthesized from commercially available micron sized CaCO3. The morphology of CaCO3 coated with different wt% of nano-TiO2 (1 to 10 wt%) was investigated by field emission scanning electron microscopy (FESEM). The crystallite size, lattice parameters, and strain of the decomposed product for all the samples were estimated by Rietveld refinement of X-ray diffraction (XRD) data. The carbonation of nano-TiO2 promoted CaO sorbents was studied on a thermogravimetric analyzer (TG) under a CO2 atmosphere (0.02 MPa) at different temperatures (600, 650 and 700 °C) and the results were compared with the CaO obtained from pure micron sized CaCO3. The results show that the sorption capacity of nano-TiO2 promoted CaO sorbents is several times higher than that of the pure CaO. The improvement could be ascribed to the porous structure and smaller crystallite size of CaO in the presence of nano-TiO2, which is supported by FESEM and XRD. In fact, the sorption capacity of nano-TiO2 promoted CaO is found to be higher than that of the CaO obtained from nano-CaCO3. The shifting of the transition point between two-stage carbonation reactions is correlated with the wt% of nano-TiO2, the crystallite size, and the strain inside the CaO. The optimum wt% of nano-TiO2 and sorption temperature of the sorbents are explored to achieve the maximum sorption capacity. Finally, the experimental results are fitted with theoretical models based on the shrinking core model, and kinetic parameters are evaluated.
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Reaction Chemistry & Engineering is an interdisciplinary journal reporting cutting-edge research focused on enhancing the understanding and efficiency of reactions. Reaction engineering leverages the interface where fundamental molecular chemistry meets chemical engineering and technology. Challenges in chemistry can be overcome by the application of new technologies, while engineers may find improved solutions for process development from the latest developments in reaction chemistry. Reaction Chemistry & Engineering is a unique forum for researchers whose interests span the broad areas of chemical engineering and chemical sciences to come together in solving problems of importance to wider society. All papers should be written to be approachable by readers across the engineering and chemical sciences. Papers that consider multiple scales, from the laboratory up to and including plant scale, are particularly encouraged.




