Table 2. Structural and Physical Properties of SZ Catalysts Calcined at 625 °C with Varying S/Z Ratios.

catalyst	SBETa (m2/g)	pore volumebVp (mL/g)	pore diametercDp (nm)	tetragonal phased (%)
NS	74	0.60	31.2	52
0.1-SZ	133	0.85	23.8	83
0.25-SZ	127	0.69	21.3	81
0.5-SZ	81	0.37	18.6	69
1.0-SZ	44	0.16	18.3	Amorphous
2.0-SZ	29	0.08	7.5	Amorphous

^aSurface area (S_BET) determined from BET analysis on adsorption branch.

^bCalculated from BJH analysis on the desorption branch.

^cAverage mesopore diameter.

^dThe percentage of the tetragonal phase was determined from the ratio of the integrated intensities of diffraction angles corresponding to tetragonal (2θ = 30.2°) and monoclinic (2θ = 28.2° and 31.4°) zirconia, as described elsewhere.⁵²