Modification of CaO by Organic Alumina Precursor for Enhancing Cyclic Capture of CO2 Greenhouse Gas

Abstract

The modification of CaO sorbent with organic alumina precursor to enhance the sorption capacity during cyclic capture is demonstrated in this study. The results indicate that during the 10 min sorption time for each cycle, the CO2 sorption capacity of original CaO sorbent is significantly decreased from 0.27 to 0.19 and 0.12 g CO2/g sorbent after 5 and 60 cycles, respectively. On the other hand, the organic alumina modified CaO has a fresh capacity of 0.22 g CO2/g sorbent, it increases to 0.24 g CO2/g sorbent after 5 cycles, and then decreases to around 0.15 g CO2/g sorbent after 60 cycles. When increasing the sorption time to 60 min at the 66th cycle, the sorption capacity of original CaO is 0.2, whereas it is 0.26 g CO2/g sorbent for organic alumina modified CaO. The results demonstrate that by adding only 5% by weight of Ca12Al14O33 species into the CaO sorbent, the CO2 sorption capacity can be enhanced up to similar to 27% by weight.