This project studied the properties of nano CaO/Al 2 O 3 as a high-temperature CO 2 sorbent for its use in an adsorption enhanced reforming reaction. The sorbent containing nano CaCO 3 precursors and aluminum oxide was prepared, and evaluation of the CO 2 adsorption properties by a thermogravimetric analyzer, the results show that nano CaO/Al 2 O 3 has a faster decomposition rate and has a higher CO 2 adsorption ratio than micro CaO/Al 2 O 3 . The maximum adsorption ratio occurs at temperatures of 650 °C under a CO 2 partial pressure of 0.33 atm. Durability studies show that the CO 2 adsorption ratio remains at 68.3% after 50 cyclic runs under a carbonation temperature of 650 °C and calcination temperature of 800 °C, respectively. XRD, SEM, and BET were used for studying the change of micro characteristics of the CO 2 sorbents before and after multiple carbonation−calcination runs. The results showed that the pore size of CaO/Al 2 O 3 sorbents was enlarged and that a new substance (Ca 12 Al 14 O 33 ) was formed even under a temperature of 800 °C for the function of keeping the compound stable and durable.
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Wu et al. (2007) studied this question.
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