Table 2.

The characterization of various MgO catalysts.

Catalysts	Specific surface areaa (m2/g)	Total pore volumeb (cm3/g)	Average pore sizec (nm)	Crystallite sizes (nm)
MgO-P-NaOH-3	99	0.44	17.41	8.7
MgO-P-NaOH-6	73	0.32	17.38	7.6
MgO-P-NaOH + Na2CO3-3/1	104	0.48	18.53	10.4
MgO-P-NaOH + Na2CO3-1/3	137	0.88	23.66	11.7
MgO-P-Na2CO3-3	149	0.88	23.68	12.0
MgO-P-Na2CO3-3.14	162	0.97	23.91	13.1

^aCalculated by Brunauer–Emmett–Teller (BET) method;

^bVolume adsorbed at P/P₀ = 0.99;

^cCalculated based on BJH method.