Lookup NU author(s): Gaurav Bhaduri,
Dr Mohammed Alamiry,
Professor Lidija Siller
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The hydration reaction of CO2 is one of the rate limiting steps for CO2 absorption in aqueous solutions and for aqueous CO2 mineralization. The catalytic activity of nickel nanoparticles (NiNPs) during CO2 hydration is studied at different temperatures, pH and low CO2 partial pressures to simulate actual flue gas conditions. Results show that NiNPs can work as active catalyst for the hydration of CO2 in applications such as CO2 separation and CO2 mineralization. The NiNPs display optimum activity between 20-30 °C and at pH value <8. They demonstrate catalytic activity even at low CO2 partial pressures (12 vol%)and in 50 wt% K2CO3 solution, an enhancement of 77% is observed in the rate of CO2 absorption when they are present. Commercially, CO2-saturated K2CO3 solutions are usually regenerated at 150 °C. At this temperature NiNPs show no significant surface oxidation but they still exhibit catalytic activity for the hydration reaction of CO2. CO2 absorption and mineralization (as CaCO3) in DI water has found to be three times higher in presence of NiNPs. Calcite (CaCO3) particles precipitated in presence of NiNPs are spherical in morphology.
Author(s): Bhaduri G, Alamiry M, Siller L
Publication type: Article
Publication status: Published
Journal: Journal of Nanomaterials
Online publication date: 05/11/2015
Acceptance date: 07/10/2015
ISSN (print): 1687-4110
ISSN (electronic): 1687-4129
Publisher: Hindawi Publishing Corporation
Data Source Location: http://dx.doi.org/10.17634/135315-1
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