Abstract
Abstract High-temperature CO 2 capture using a Ca/Al carbonate sorbent, made of Ca–Al–CO 3 powder and a TiO 2 binder, was studied. Calcium aluminates were synthesized by the coprecipitation of Ca 2 + , Al 3 + , and CO 3 2 − under alkaline conditions. The results showed that TiO 2 nanoparticles significantly improved surface area and cyclic stability of sorbents in thermogravimetric analysis (TGA) and reactor. Six types of Ca / Ti pellets were prepared, using a Ca–Al–CO 3 /TiO 2 weight ratio of 1–6:1. These granules gave a very stable CO 2 uptake, to 80% of their full capacity, for 10 cycles, compared to only 35% using Ca–Al–CO 3 . A possible reaction scheme for stabilizing the CaO microstructure for multi-cycle experiments is described.
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