Preparation method and application of SSZ-13 molecular sieve catalyst
A molecular sieve and catalyst technology, which is applied in the field of molecular sieve preparation and environmental catalysts, can solve the problems of poor molecular sieve quality, high raw material cost, long working hours, etc., and achieve the effect of wide active window, excellent performance and high quality
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Embodiment 1
[0040] (1) Synthesis of N,N-dimethyl-hydroxyethyl-cyclohexyl-ammonium bromide
[0041] First add 10g N,N-dimethylcyclohexylamine, 30g toluene, add 10.5g bromoethanol dropwise under stirring condition, after dropwise addition, stir and react for 2-3 days, add deionized water after reaction, separate organic phase, water The phase is an aqueous solution of N,N-dimethyl-hydroxyethyl-cyclohexyl-ammonium bromide.
[0042] (2) Synthesis of SSZ-13 molecular sieve
[0043] First add 23.2g of deionized water, 11.4g of N,N-dimethyl-hydroxyethyl-cyclohexyl-ammonium bromide aqueous solution, and slowly add 18.4g of silica sol and 23.0g of water glass into the kettle while stirring, Then add 4.1g NaA molecular sieve and 0.025g SSZ-13 molecular sieve raw powder into the system as seed crystals, stir evenly to obtain the initial gel; transfer the gel to a stainless steel reaction kettle, and crystallize at 165°C for 18 hours; , after cooling, suction filtration, washing with deionized wate...
Embodiment 2
[0048] (1) Treatment of type A molecular sieve
[0049] Add 12g of ammonium sulfate to a small beaker, add 88g of water, fully dissolve, add 5g of NaA molecular sieve, exchange ammonium at 80°C for 1h, filter, rinse with deionized water, and dry at 120°C to obtain NH 4 A molecular sieve.
[0050] (2) Synthesis of SSZ-13 molecular sieve
[0051] First add 7.5g deionized water, 21.0g N,N,N-trimethyl-benzyl-ammonium hydroxide aqueous solution, slowly add 10.1g silica sol, 39.8g water glass in the tank under stirring, then add Add 1.5g NH to the system 4 A molecular sieve and 0.003g SSZ-13 molecular sieve finished product were used as seed crystals, stirred evenly to obtain an initial gel; the gel was transferred to a stainless steel reaction kettle, and crystallized at 135°C for 24 hours; Washing with ionized water and drying at 120°C for 4 hours to obtain the raw powder of SSZ-13 molecular sieve; then exchanged with ammonium and roasted at 550°C for 5 hours to obtain the fini...
Embodiment 3
[0056] (1) Synthesis of SSZ-13 molecular sieve
[0057] First add 1.7g of deionized water, 20.4g of N,N,N-triethyl-cyclohexyl ammonium bromide aqueous solution, slowly add 17.8g of silica sol, 38.6g of water glass into the tank under stirring, and then add to the system Add 1.5g NaA molecular sieve and 0.025g SSZ-13 molecular sieve finished product as crystal seeds, stir evenly to obtain the initial gel; transfer the gel to a stainless steel reaction kettle, and crystallize at 165°C for 24h; after crystallization, cool, Suction filtration, washing with deionized water, and drying at 120°C for 4 hours to obtain the raw powder of SSZ-13 molecular sieve; then exchanged with ammonium, and roasted at 530°C for 5 hours to obtain the finished product of SSZ-13 molecular sieve.
[0058] (2) Preparation of copper-based SSZ-13 molecular sieve catalyst
[0059] Consistent with part (2) of Example 1.
[0060] The silicon-aluminum ratio of the molecular sieve prepared in Example 3 is 38....
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