Na-ETS-10 was synthesized using the hydrothermal technique
as described elsewhere (Kuznicki, 1991). A typical sample was
prepared by thorough mixing of 50 g of sodium silicate (28.8%
SiO2, 9.14% Na2O), 3.2 g of sodium hydroxide (97þ% NaOH), 3.8 g
of anhydrous KF, 4 g of HCl (1 M), and 16.3 g of TiCl3 solution. The
mixture was stirred in a blender (Waring) for 1 h. Then it was
transferred to a 125 mL sealed autoclave (PARR instruments) and
heated at 215 1C for 64 h. The resultant material was carefully
washed with de-ionized water and then dried in an oven at
100 1C. The material was reduced to fine powder (o150 mm) and
pelletized by mixing 6 g of the material (equilibrated at 100 1C)
with 2 g of Ludox HS-40 colloidal silica (Aldrich). Morter and
pastle were used to homogenize the mixture. Then the mixture
was compressed using a pellet press at 10,000 psi for 3 min. The
resulting cake was crushed and sieved to acquire 16–20 mesh
particles. The prepared pellets were used in the adsorption–
desorption experiments.