(weight loading of 8%) under stirring. The as-prepared AgNO3/SBA-15 and AgNO3/Al-SBA-15 samples were aged at room
temperature overnight and then dried at 70 C for 12 h. The prepared Ag/Al-SBA-15 catalysts are denoted as Ag/Al-SBA-15 (x), where x is Si/Al ratio in the synthesis gel .