Method of preparing an activated EU-2 zeolite
Disclosed herein is a method of making activated EU-2 zeolite, including: pores having a diameter of 30 to 40 Å while maintaining the crystal structure of the EU-2 zeolite; and pores having a diameter of 40 to 200 Å, wherein the volume of the pores having a diameter of 30 to 40 Å is 0.01 to 0.06 cc/g, and the volume of the pores having a diameter of 40 to 200 Å is 0.07 to 0.4 cc/g.
1. A method of preparing an activated EU-2 zeolite, comprising the steps of:
a) hydrothermally synthesizing an EU-2 zeolite; and
b) activating the EU-2 zeolite by bringing the EU-2 zeolite into contact with an aqueous alkali solution before or after calcining the EU-2 zeolite,
wherein the activated EU-2 zeolite comprises:
pores having a diameter of 30 to 40 Å while maintaining a crystal structure of the EU-2 zeolite; and
pores having a diameter of 40 to 200 Å,
wherein a volume of the pores having a diameter of 30 to 40 Å is 0.01 to 0.06 cc/g, and a volume of the pores having a diameter of 40 to 200 Å is 0.07 to 0.4 cc/g.
2. The method of claim 1 , wherein, in the step b), a molar ratio of alkali cation to aluminum (Na + /Al 2 O 3 ) in the EU-2 zeolite is 0.1 to 0.3.
3. The method of claim 1 , further comprising the step o£ c) substituting alkali cation in the activated EU-2 zeolite with ammonium ion.
4. The method of claim 1 , wherein, in the step b), a molar ratio of silica/alumina in the activated EU-2 zeolite is reduced by 6 to 59% compared to the EU-2 zeolite before the step b).
5. The method of claim 1 , wherein, in the step a), a molar ratio of silica/alumina in the hydrothermally synthesized EU-2 is 80 to 300.
6. The method of claim 1 , wherein, in the step a), a volume of the pores having a diameter of 30 to 40 Å in the hydrothermally synthesized EU-2 zeolite is 0.01 to 0.05 cc/g, and a volume of the pores having a diameter of 40 to 200 Å therein is 0.05 cc/g or less.
7. The method of claim 1 , wherein, in the step a), a total specific surface area of the hydrothermally synthesized EU-2 zeolite is 210 to 250 m 2 /g.
8. The method of claim 1 , wherein the alkali is Na, K or a combination thereof.
9. The method of claim 8 , wherein the aqueous alkali solution has a concentration of 0.05 to 0.3 M and a pH of 13.1 to 13.45.