Abstract
We fabricated the Zr-doped CaO sorbent for high-temperature CO2 capture by the wet high-energy co-milling of calcium carbonate and natural zirconium dioxide (baddeleyite) for the first time. The morphology of the material was examined by scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. Its CO2 uptake capacity was determined using thermogravimetric analysis. After 50 carbonation–calcination cycles, the Zr-doped CaO sorbent characterized by a high enough CO2 uptake capacity of 8.6 mmol/g and unchanged microstructure due to CaZrO3 nanoparticles uniformly distributed in the CaO matrix to prevent CaCO3 sintering under carbonation. The proposed easy-to-implement CaO-based sorbents fabrication technique is promising for industrial application.
Highlights
Carbon dioxide is among the major greenhouse gases promoting global warming leading to climate change
Post-combustion capture, used to capture CO2 from flue gas produced by fossil fuel burning, is competitive in cost with the other two approaches, but can be applied in the existing power plants without any major modification
The calcium looping (CaL) process employs a low cost CaO sorbent and efficiently operates at temperatures above 600 ◦ C, which are commonly used by power plants to produce saturated steam, in contrast to amine scrubbing and pressure swing adsorption
Summary
Carbon dioxide is among the major greenhouse gases promoting global warming leading to climate change. The main anthropogenic CO2 sources are power plants especially the ones generating energy by burning coal, which is the most carbon-intensive fossil fuel [1,2,3]. Post-combustion capture, used to capture CO2 from flue gas produced by fossil fuel burning, is competitive in cost with the other two approaches, but can be applied in the existing power plants without any major modification. Among post-combustion capture technologies, amine scrubbing, pressure swing adsorption and calcium looping (CaL), known as the regenerative calcium cycle, are commercially implemented for CO2 capture [4]. The CaL process employs a low cost CaO sorbent and efficiently operates at temperatures above 600 ◦ C, which are commonly used by power plants to produce saturated steam, in contrast to amine scrubbing and pressure swing adsorption. The CaL process is less energy-intensive and creates less environmental burden alternative to amine scrubbing [6]
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