Synthesis of Calcium Aluminates Granule with TiO2 Binder for High-temperature CO2 Capture

High-temperature CO2 captures using powder and granule is investigated using thermogravimetric analyzer (TGA) and fixed-bed reactor (FBR). The CO2 sorbent, Ca-Al-CO3 powder was prepared using co-precipitation method of Ca+2, Al+3 and CO32- under alkaline conditions. The granule was fabricated by mixing Ca-Al-CO3 powder, H2O and w/or w/o TiO2 binder, followed by granulation and calcinations at 600 degrees C. In TGA experiment, high CO2 capacity of 45 similar to 50 wt% after 100 cycles can be achieved with powder at 750 degrees C, while it was dramatically decayed to 40-50% only after 2-5 cycles in FBR. Alternatively, using Ca/Ti granule exhibited recovery of 80-90% for 15 cycles in TGA and 70-80% for 10 cycles in FBR, respectively. This outcome indicates that calcium aluminates granule with TiO2 binder is competitive CO2 sorbent. (C) 2013 The Authors. Published by Elsevier Ltd. Open access under CC BY-NC-ND license. Selection and/or peer-review under responsibility of GHGT