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

A SAPO-41, a new type of template technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of miscellaneous crystals, high preparation cost, unfavorable mass industrial production, etc., and achieve reduced synthesis Cost, low price, the effect of realizing mass industrial production

Active Publication Date: 2014-12-10
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
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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 Patents(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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