SAPO-34 hierarchical porous molecular sieve and its preparation method and application
A SAPO-34, molecular sieve technology, applied in the direction of molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali-exchanged phosphate, etc., can solve the problems of molecular sieve deactivated diene yield, high synthesis cost, and formation of carbon deposits. , to shorten the synthesis and crystallization time, increase the process steps, and achieve the effect of good catalytic performance.
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[0020] The present invention also provides a preparation method of SAPO-34 hierarchical porous molecular sieve, comprising the following steps:
[0021] (1) Mix and stir deionized water and phosphorus source evenly to obtain a uniform mixed solution; then add silicon source to the mixed solution and stir evenly, then add aluminum source and stir evenly, and finally add organic amine template agent and stir evenly to obtain a uniformly mixed solution Reaction solution; wherein, the silicon source is at least one of SBA-15, MCM-41, MCM-48 or kaolin;
[0022] (2) Aging the uniformly mixed reaction solution first, followed by segmental constant temperature crystallization, cooling after crystallization, washing, and drying to obtain a honeycomb SAPO-34 molecular sieve on the surface;
[0023] (3) Calcining the honeycomb SAPO-34 molecular sieve to prepare the nanosheet honeycomb self-assembled SAPO-34 hierarchical porous molecular sieve.
[0024] The present invention utilizes the...
Embodiment 1
[0046] The preparation of SAPO-34 hierarchical porous molecular sieve: comprise the following steps:
[0047] (1) Silicon source, aluminum source, phosphorus source, organic amine template agent R, and deionized water were prepared with SiO 2 、Al 2 o 3 ,P 2 o 5 , R, H 2 O meter, its molar ratio==0.2:1:1:2.7:50, take by weighing 20g deionized water and 16g phosphoric acid mix, stir 10min, obtain homogeneous mixture, take by weighing 0.84g SBA-15 (mesoporous pore size distribution 10nm, the specific surface area is 700m 2 g –1 , the pore volume is 0.90cm 3 g –1 ); added in the above mixed solution, stirred for 30min; weighed 10.2g of pseudo-boehmite and added to the above mixed solution, and added 43.1g of deionized water, stirred for 30min; weighed 19.1g of organic amine template R (triethyl Amine) was added to the above mixture, and stirred for 30 min.
[0048] (2) Transfer the uniformly mixed reaction solution to a 150mL reactor, place it in a homogeneous reactor, a...
Embodiment 2
[0051] The preparation of SAPO-34 hierarchical porous molecular sieve: comprise the following steps:
[0052] (1) Silicon source, aluminum source, phosphorus source, organic amine template agent R, and deionized water were prepared with SiO 2 、Al 2 o 3 ,P 2 o 5 , R, H 2 O meter, its molar ratio==0.3: 1.1: 1.1: 2: 70, take by weighing 30g deionized water and 17.6g phosphoric acid mix, stir 10min, obtain homogeneous mixture, take by weighing 1.26g MCM-41 (mesoporous pore diameter The distribution is 5nm and the specific surface area is 900m 2 g –1 , the pore volume is 1.0cm 3 g –1 ) was added to the above mixed solution, and stirred for 30 minutes; 11.2g of pseudoboehmite was weighed and added to the above mixed solution, and 58.3g of deionized water was added, and stirred for 30 minutes; 14.2g of organic amine template R (triethylamine ) was added to the above mixture, and stirred for 30 min.
[0053] (2) Transfer the uniformly mixed reaction solution to a 150mL react...
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