A kind of modified Y-type molecular sieve and preparation method thereof
A molecular sieve and modification technology, applied in octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve strong anti-coking ability, reduce silicon-aluminum ratio, good catalytic activity and diffusion performance
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Embodiment 1
[0020] Under stirring conditions, mix Y-1 and tetrapropylammonium hydroxide solution in a high-pressure reactor, feed nitrogen to control the system pressure at 0.4MPa, then raise the temperature to 70°C, continue stirring at constant temperature for 2 hours, and release the pressure. Cool, filter with suction until the pH value is less than 9, dry at 120°C for 12 hours, and calcinate at 500°C for 3 hours to obtain a modified Y-type molecular sieve. The concentration of the tetrapropylammonium hydroxide solution is 0.12mol / L, and the mass ratio of Y-1 to water in the solution is 1:9. The specific properties of molecular sieves are shown in Table 1.
Embodiment 2
[0022] Under stirring conditions, Y-1 and tetrabutylammonium hydroxide solution were mixed in a high-pressure reactor, and air was introduced to control the system pressure at 0.6MPa, then the temperature was raised to 80°C, and constant temperature stirring was continued for 1 hour, pressure relief, cooling, Suction filtration until the pH value is less than 9, drying at 110°C for 18 hours, and calcining at 550°C for 4 hours to obtain a modified Y-type molecular sieve. The concentration of tetrabutylammonium hydroxide solution is 0.15mol / L, and the mass ratio of Y-1 to water in the solution is 1:11. The specific properties of molecular sieves are shown in Table 1.
Embodiment 3
[0024] Under stirring conditions, mix Y-1 and tetraethylammonium hydroxide solution in a high-pressure reactor, feed nitrogen to control the system pressure at 0.2MPa, then raise the temperature to 60°C, continue stirring at constant temperature for 3 hours, and release the pressure. Cool, filter with suction until the pH value is less than 9, dry at 100°C for 24 hours, and calcinate at 520°C for 6 hours to obtain a modified Y-type molecular sieve. The concentration of tetraethylammonium hydroxide solution is 0.14mol / L, and the mass ratio of Y-1 to water in the solution is 1:10. The specific properties of molecular sieves are shown in Table 1.
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