Method for synthesizing SAPO-41 (Phosphoric Acid Silicon-Aluminum-41) molecular sieve by adopting novel template agent

A SAPO-41, a new template technology, applied in molecular sieve and alkali-exchanged phosphate, molecular sieve-specific silicoaluminophosphate, etc., can solve the problems of mixed crystals, unfavorable large-scale industrial production, and high preparation cost, and reduce synthesis costs. , to achieve the effect of large-scale industrial production and low price

Active Publication Date: 2013-04-03
HEILONGJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing method for synthesizing SAPO-41 molecular sieve with di-n-propylamine (DPA) as template agent has high preparation cost, miscellaneous crystals, and is unfavorable for realizing large-scale industrial production, and provides a Method for Synthesizing SAPO-41 Molecular Sieve Using New Template Agent

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  • Method for synthesizing SAPO-41 (Phosphoric Acid Silicon-Aluminum-41) molecular sieve by adopting novel template agent
  • Method for synthesizing SAPO-41 (Phosphoric Acid Silicon-Aluminum-41) molecular sieve by adopting novel template agent
  • Method for synthesizing SAPO-41 (Phosphoric Acid Silicon-Aluminum-41) molecular sieve by adopting novel template agent

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specific Embodiment approach 1

[0009] Specific embodiment one: this embodiment is a kind of method that adopts novel templating agent to synthesize SAPO-41 molecular sieve, specifically is to carry out according to the following steps:

[0010] 1. Add phosphoric acid, pseudoboehmite, di-n-butylamine and silica sol with a mass fraction of 85% into deionized water in sequence, and stir at a speed of 500r / min~2000r / min for 1h~8h to obtain the initial Gel; 2. Place the initial gel obtained in step 1 in a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallize at 160°C~200°C for 2h~72h, then cool to room temperature, and cool to room temperature to produce The crystallized product was centrifuged, washed and dried at 100°C~200°C for 10h~24h in sequence, and finally calcined at 500°C~700°C for 4h~30h, and naturally cooled to room temperature to obtain SAPO-41 molecular sieve.

[0011] The mass fraction described in step one of the present embodiment is that the mass ratio of phosphoric a...

specific Embodiment approach 2

[0016] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass ratio of phosphoric acid with a mass fraction of 85% and pseudo-boehmite described in step one is 1:(0.5~1.9). Others are the same as the first embodiment.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the mass fraction of phosphoric acid and di-n-butylamine described in step one is 1:(12~2.1) . Others are the same as the second or third specific embodiment.

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Abstract

The invention discloses a method for synthesizing SAPO-41 (Silico-Alumino-Phosphate-41) molecular sieve by adopting a novel template agent, relates to a synthesis method of the silico-alumino-phosphate molecular sieve, in particular relates to a synthesis method of the silico-alumino-phosphate molecular sieve SAPO-41, and solves the problems that the method for synthesizing the SAPO-41 molecular sieve by using a conventional DPA (Di-n-Propylamine) as the template agent is high in preparation cost, has mixed crystal and is not beneficial for the realization of large-scale industrial production. The method comprises the following steps: firstly, preparing 85 percent by mass of phosphoric acid, pseudo-boehmite, di-n-butylamine, silica sol and distilled water into initial gel; and secondly, crystallizing, cooling to the room temperature, centrifuging, washing, drying, roasting and naturally cooling the initial gel to the room temperature so as to obtain the SAPO-41 molecular sieve. The method has the advantages that firstly, the product is in pure phase; secondly, the synthesis cost of the molecular sieve is greatly reduced; and thirdly, the large-scale industrial production is realized. The method is mainly used for synthesizing the SAPO-41 molecular sieve.

Description

technical field [0001] The invention relates to a synthesis method of silicoaluminophosphate molecular sieve, in particular to a synthesis method of silicoaluminophosphate molecular sieve SAPO-41. Background technique [0002] SAPO-41 is a silicoaluminophosphate mesoporous molecular sieve with AFO topology. It has a one-dimensional elliptical channel composed of ten-membered rings, and the channel size is 0.43nm×0.70nm. The framework of SAPO-41 molecular sieve is composed of Si, Al, P and O elements, which belongs to the orthorhombic crystal system, and the unit cell size is a=0.97nm, b=2.55nm, c=0.84nm. SAPO-type molecular sieves not only have mild acidity, but also their pore size and geometric configuration are very conducive to the formation of single-branched alkane isomers. Therefore, SAPO-41 molecular sieves are used as acidic carriers to support noble metals. It exhibits excellent catalytic activity and isomerization selectivity in n-paraffin hydroisomerization reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 吴伟赵爱娟张瑞肖林飞
Owner HEILONGJIANG UNIV
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