A kind of hierarchical porous sapo-34 molecular sieve and its application in methanol to olefin reaction
A molecular sieve, multi-level pore technology, applied in the direction of molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali-exchanged phosphate, etc., can solve the problem of single pore structure, etc., and achieve extended catalytic life, good mass/heat transfer. Efficiency, effect of good light olefin selectivity
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Embodiment 1
[0033] The hierarchical porous SAPO-34 molecular sieve of the present embodiment is prepared by the following steps:
[0034] 1) Add pseudo-boehmite into deionized water, stir for 1 hour and dissolve completely, then add phosphoric acid drop by drop, stir vigorously at 400-600r / min for 2 hours, then add white carbon black, and stir at 400-600r / min for 1 hour Make it disperse evenly, then add triethylamine drop by drop, stir at 400-600r / min for 2h to form a uniform synthetic gel;
[0035] Add acrylamide monomer, cross-linking agent and initiator to the synthetic gel, add water to the formula amount, and stir at 400-600r / min for 2 hours to obtain a mixed gel; the cross-linking agent is N-N methylenebisacrylamide , the initiator is ammonium persulfate, the mass ratio of acrylamide, N-N methylenebisacrylamide, ammonium persulfate is 100:1:0.5, acrylamide, pseudoboehmite (with Al 2 o 3 meter) molar ratio of 0.2:1;
[0036] Triethylamine, pseudoboehmite (with Al 2 o 3 In terms ...
Embodiment 2
[0039] The hierarchical porous SAPO-34 molecular sieve of the present embodiment is prepared by the following steps:
[0040]1) Prepare the synthetic gel according to the method of step 1) of Example 1, add a non-ionic polyacrylamide aqueous solution with a molecular weight of 6 million and a mass content of 0.1%-0.5% to the synthetic gel and add Deionized water until the total water volume reaches the formula volume, and stir for 2 hours to obtain a mixed gel;
[0041] Triethylamine, pseudoboehmite (with Al 2 o 3 In terms of), phosphoric acid (in P 2 o 5 In terms of), white carbon black (in terms of SiO 2 ), the mol ratio of water (total water content) is the same as in Example 1, and the addition of nonionic polyacrylamide is 0.1% of the total mass of the mixed gel.
[0042] 2) Transfer the mixed gel to a stainless steel reaction kettle lined with polytetrafluoroethylene, conduct hydrothermal crystallization at 200°C for 24 hours, wash the obtained crystals with deioniz...
Embodiment 3
[0044] The preparation method of the multistage porous SAPO-34 molecular sieve of the present embodiment is basically the same as that of the molecular sieve of embodiment 1, the difference is only in:
[0045] In step 1), acrylamide, pseudo-boehmite (with Al 2 o 3 The molar ratio of the meter) is 0.2:1; triethylamine, pseudo-boehmite (based on Al 2 o 3 In terms of), phosphoric acid (in P 2 o 5 In terms of), white carbon black (in terms of SiO 2 The molar ratio of water (total water) to water (total water) is 3:1.2:1.2:0.8:60.
[0046] In step 2), hydrothermal crystallization was carried out at 160° C. for 36 hours; then calcined in a muffle furnace at 600° C. for 4 hours.
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