Mesopore USSTI zeolite with high silicon content and high hydrothermal stability and preparation method thereof
A technology of hydrothermal stability and thermal stability, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high price of ammonium fluorosilicate solution, environmental pollution of fluoride ions, poor hydrothermal stability, etc., and achieve wide market application Prospects, low cost of industrialization, and the effect of simple preparation methods
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[0034] The original Ca-STI zeolite is prepared according to the method described in the present invention, and the ammonium solution is heat-exchanged according to the different ammonium exchange conditions described in Table 1. After washing and drying, it is compressed into tablets and broken into particles with a particle size of 30-50 meshes. In the tube furnace, 110°C saturated water vapor (according to the different steam treatment conditions described in Table 1) was treated for a certain period of time at a certain flow rate and a certain temperature to obtain high-silicon high-hydrothermal stability with the physical and chemical properties described in Table 1. Mesoporous USSTI zeolite.
[0035] Table 1 shows the different ammonium exchange conditions used in Examples 1-12, different steam treatment conditions and the physicochemical properties of the prepared high-silicon and high-hydrothermal-stability mesoporous USSTI zeolite.
[0036]
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