Core-shell hierarchical-pore double-molecular-sieve catalytic material as well as preparation method and application thereof
A molecular sieve catalytic material and bi-molecular sieve technology, applied in molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of catalyst activity, service life, adverse effects on product selectivity, carbon deposition, slow diffusion, etc. The preparation steps and production equipment are simple, and the reaction rate is improved and the reaction rate is fast.
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Embodiment 1
[0123] The preparation of embodiment 1 catalyst
[0124] Keep the solution temperature at 65°C, and treat the Hβ molecular sieve with a NaOH aqueous solution with a concentration of 0.2mol / L for 0.5 hours. (calculated as Hβ molecular sieve) surfactant CTAB, silicon source TEOS and aluminum source TIP, Hβ molecular sieve is coated with MCM-41 molecular sieve and the pH value is adjusted to 9. The solution was washed to neutrality, poured into a hydrothermal kettle for hydrothermal reaction at 120°C for 48 hours, then suction filtered, dried at 120°C for 8 hours, calcined at 550°C for 3 hours, and the coated MCM-41 molecular sieve Si / Al was 80 , to obtain the Na-type core-shell multi-level porous bimolecular sieve catalytic material; keep the solution temperature at 80 ° C, and use the Na-type core-shell multi-level porous bimolecular sieve catalytic material with a concentration of 0.8mol / L NH 4 NO 3 The solution was treated for 6 hours, dried at 100°C for 12 hours after wash...
Embodiment 2
[0125] The preparation of embodiment 2 catalyst
[0126] Keep the solution temperature at 70°C, and treat the Hβ molecular sieve with a NaOH solution with a concentration of 0.2mol / L for 0.5 hours. (Hβ molecular sieve is the base) surfactant CTAB, silicon source white carbon black and aluminum source TIP, Hβ molecular sieve is coated with MCM-41 molecular sieve and the pH value is adjusted to 9.5. The solution was washed to neutrality, poured into a hydrothermal kettle, hydrothermally reacted at 110°C for 42 hours, then suction filtered, dried at 100°C for 12 hours, calcined at 450°C for 2 hours, and the coated MCM-41 molecular sieve Si / Al was 30 , to obtain the Na-type silicon-rich hierarchical porous molecular sieve material; keep the solution temperature at 70 ° C, and use the Na-type core-shell hierarchical porous bimolecular sieve catalytic material with a concentration of 0.6mol / L NH 4 NO 3 The solution was treated for 6 hours, dried at 100°C for 12 hours after washing...
Embodiment 3
[0127] The preparation of embodiment 3 catalyst
[0128] Keep the solution temperature at 75°C, and treat the Hβ molecular sieve with a NaOH solution with a concentration of 0.2mol / L for 0.5 hours. (Hβ molecular sieve is the base) surfactant CTAC, silicon source silica sol and aluminum source TIP, Hβ molecular sieve is coated with MCM-41 molecular sieve, and the pH value is adjusted to 10. The solution was washed to neutrality, poured into a hydrothermal kettle for hydrothermal reaction at 140°C for 24 hours, then suction filtered, dried at 90°C for 16 hours, calcined at 450°C for 4 hours, and the coated MCM-41 molecular sieve Si / Al was 60 , to obtain the Na-type core-shell multi-level porous bimolecular sieve catalytic material; keep the solution temperature at 75 ° C, and use the Na-type core-shell multi-level porous bimolecular sieve catalytic material with a concentration of 1.0mol / L NH 4 NO 3 The solution was treated for 8 hours, dried at 90°C for 16 hours after washing...
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Abstract
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