2.1 Materials
Preparation of shaped silicalite-1 silica zeolite: A certain amount of
TAPOH and silica sol were mixed and stirred at room temperature for 2
hours. The solution was moved into a stainless steel reactor lined with
polytetrafluoroethylene and the reactor was placed in an oven at 423 K
for 24 hours. Then the product was centrifuged, washed, and dried
overnight at 353 K. The obtained powder sample was placed in a muffle
furnace and calcined at 823 K for 3 hours to obtain the powdered
silicalite-1. After that, the powdered silicalite-1 and pseudoboehmite
were mixed evenly according to the ratio of 86:14 with water. Extruded
them with an extruder and dried in an oven at 373 K. The obtained shaped
sample was placed in a muffle furnace and calcined at 823 K for 2 hours
to obtain the final product shaped silicalite-1. Its appearance was
columnar with a diameter of 3 mm and a length of about 10 mm.