Abstract
The temperature-programmed desorption (TPD) of CO 2 has been performed to elucidate the strength and the number of base sites on mesoporous alumina ( mesoAl 2O 3). It was demonstrated that the surface of mesoAl 2O 3 adsorbs a much smaller amount of CO 2 than those of MgO and conventional γ-Al 2O 3 with irregular pores, but that there exist a small number of strong base sites on mesoAl 2O 3 that adsorb CO 2 very strongly. The CO 2-TPD results clearly account for the high activity of mesoAl 2O 3, the low activity of γ-Al 2O 3, and no activity of MgO for a typical base-catalyzed reaction of the Knoevenagel reaction in supercritical CO 2.
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