ZHANG Lei, ZHANG Li, YAN Yunfei, et al. Effect of Ce, Zr on cyclic performance of CaO-based CO2 sorbents[J]. CIESC Journal, 2015, (2): 612-617. DOI: 10.11949/j.issn.0438-1157.20141071.
ZHANG Lei, ZHANG Li, YAN Yunfei, et al. Effect of Ce, Zr on cyclic performance of CaO-based CO2 sorbents[J]. CIESC Journal, 2015, (2): 612-617. DOI: 10.11949/j.issn.0438-1157.20141071.DOI:
CaO-based sorbents with Ce and Zr as dopants were prepared by the method of wet mixing and subsequent calcination. The cyclic CO2 sorption/desorption performance of 24 sorbents was tested with thermogravimetric analyzer (TGA). CeO2 could increase CO2 sorption rate in the diffusion-controlled regime because the large quantity of oxygen vacancies in CeO2 could facilitate CO2 diffusion through the produced CaCO3 layer and then react with the uncreated CaO. Dispersion of CeO2 on CaO could also inhibit agglomeration of CaO crystal and its sintering at high temperature. Stability of CaO in sorption/desorption cycle increased with increasing amount of CeO2 in the sorbents. With a high Tammann temperature
the newly produced CaZrO3 from zirconia and calcium oxide could serve as a supporting framework and effectively restrain sintering.