Synthesis and catalytic Reaction of [Zr] ZSM-5

The effect of Na2/SiO2 and SiO2/ZrO2 molar ratios on the synthesis of [Zr] ZSM-5 type zeolites and their catalytic activities in phenol hydroxylation were investigated. The effect of variation of Na2O/SiO2 and SiO2,/ZrO2, molar ratios in the starting reaction mixture on the synthesis of [Zrl ZSM-5 was observed. At higher Na2O/SiO2 ratio, a large amount of α-SiO2, was formed. In contrasttat lower Na2O/SiO2 ratio, some amorphous material was formed. [ZrlZSM-5 zeolites are able to be synthesized within Na2O/SiO2, ratios ranging from 0.033 to 0. 167. But the [Zrl ZSM-5 zeolites formed from various Na2O/SiO2 ratios have different catalytic activities. At SiO2/ZrO2 ratios in the range 15~95, [ZrlZSM-5 zeolite can also be synthesized. But the catalytic activities obviously depend on the SiO2/ZrO2 ratio. It was also confirmed that Zr is incorporated into the zeolite framework and that Zr in the lattice plays an important role as an active site in the hydroxylation