Fig. 9. (A) XRD patterns of spent CaO/Al2O3 catalysts: (O) corresponds to -Al2O3; (*) corresponds to calcium diglyceroxide compound; (#) corresponds to Ca(OH)2/CaO; (a)20% CaO/a-Al2O3, (b) 20% CaO/b-Al2O3 and (c) 20% CaO/n-Al2O3; (d) CDG/n-Al2O3. (B) FTIR spectra of spent CaO/Al2O3 catalysts: (a) 20% CaO/a-Al2O3, (b) 20% CaO/b-Al2O3 and (c) 20% CaO/n-Al2O3; (d) CDG/n-Al2O3. (C) TG/DTA thermograms of (a) CDG/n-Al2O3 and (b) spent 20% CaO/n-Al2O3. (D) Solid state 13C NMR of (a) CDG/n-Al2O3 and (b) spent 20% CaO/n-Al2O3.