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.