Table 2. Textural Characteristics of the Synthesized Catalysts.

catalyst	BET surface area (m2/g)	pore volume (cm3/g)	pore size (Å)
support (SiO2)	385	1.12	122
Mo(1%)/SiO2	365	0.89	118
V(1%)/SiO2	364	0.99	120
W(1%)/SiO2	365	0.96	110
Mo(5%)/SiO2	353	0.87	102
V(5%)/SiO2	351	0.87	116
W(5%)/SiO2	357	0.88	99
Mo(10%)/SiO2	340	0.85	92
V(10%)/SiO2	316	0.86	107
W(10%)/SiO2	316	0.84	94