Table 1. Chemical and Physical Properties of the As-Tested Catalysts.

catalyst	SBET, m2 g–1	H–	amount of basic site, mmol g–1
MgO	5.6	7.2 ≤ H– ≤ 9.8	0.06
CaO	3.0	7.2 ≤ H– ≤ 9.8	0.15
NaAlO2	0.75	9.8 ≤ H– ≤ 11.0	0.90
SrO	1.5	11.0 ≤ H– ≤ 18.4	6.18