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Microwave heating synthesis method of SAPO (Silicoaluminophosphate)-41 molecular sieve

A technology of SAPO-41 and microwave heating, which is applied in the synthesis field of SAPO-41 molecular sieve, can solve the problems of miscellaneous crystals and long crystallization time, and achieve the effects of shortening crystallization time and strong acidity controllability

Active Publication Date: 2015-06-10
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of long crystallization time and miscellaneous crystals in the existing conventional electric heating method for synthesizing SAPO-41 molecular sieve, and provides a microwave heating synthesis method for SAPO-41 molecular sieve

Method used

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  • Microwave heating synthesis method of SAPO (Silicoaluminophosphate)-41 molecular sieve

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specific Embodiment approach 1

[0018] Specific embodiment one: the microwave heating synthesis method of a kind of SAPO-41 molecular sieve in the present embodiment is carried out according to the following steps:

[0019] 1. Phosphoric acid with a mass fraction of 80% to 90%, pseudoboehmite with a mass fraction of 65% to 75%, di-n-propylamine with a mass fraction of 95% to 99%, and 20% to 30% The silica sol is added to deionized water in turn, and stirred at a speed of 500r / min to 2000r / min for 1h to 10h to obtain the initial gel; the mass fraction described in step 1 is 80% to 90% of phosphoric acid and mass Fraction is that the mass ratio of the pseudo-boehmite of 65%~75% is 1:(0.5~1.0); The mass fraction described in step 1 is that the phosphoric acid of 80%~90% and the mass fraction are 95%~99% The mass ratio of di-n-propylamine is 1:(0.5~1.8); The mass fraction described in step 1 is that the mass ratio of the phosphoric acid of 80%~90% and the silica sol of 20%~30% is 1: (0.05~1.0); The mass fractio...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the phosphoric acid that mass fraction is 80%~90%, the pseudo-boehmite that mass fraction is 65%~75%, the mass fraction is 95%-99% di-n-propylamine and silica sol with a mass fraction of 20%-30% are sequentially added to deionized water, stirred at a speed of 1000r / min-1500r / min for 3h-7h, and the initial gel is obtained. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass fraction described in step one is 80% to 90% of phosphoric acid and 65% to 75% of quasi-thin water The mass ratio of bauxite is 1:(0.6~0.8); The mass fraction described in the step 1 is that the mass fraction of 80%~90% phosphoric acid and the mass fraction are 95%~99% of the mass ratio of di-n-propylamine is 1:( 1.0~1.5); The mass fraction described in step one is that the mass ratio of the phosphoric acid of 80%~90% and the silica sol of 20%~30% is 1:(0.1~0.7); Described in step one The mass fraction of phosphoric acid is 80% to 90% and the mass ratio of deionized water is 1: (3.0 to 4.1). Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a microwave heating synthesis method of an SAPO (Silicoaluminophosphate)-41 molecular sieve, which relates to a synthesis method of an SAPO-41 molecular sieve and aims to solve the technical problems of long crystallization time and doped crystal existence of the traditional electric heating synthesis method of the SAPO-41 molecular sieve. The synthesis method disclosed by the invention comprises the following steps of: firstly, synthesizing an initial gel; and secondly, synthesizing the SAPO-41 molecular sieve. The SAPO-41 molecular sieve synthesized by the invention can be used as a catalyst to be applied to petrochemical industry production.

Description

technical field [0001] The invention relates to a synthesis method of SAPO-41 molecular sieve. Background technique [0002] SAPO-41 molecular sieve is a kind of silicoaluminophosphate mesoporous molecular sieve with AFO topological structure. It has a one-dimensional elliptical ten-membered ring straight pore structure, and the channel size is 0.43nm×0.70nm. SAPO-41 molecular sieve is replaced by Si atom AlPO 4 P or P and Al in the framework of -41 molecular sieve, by A1O 4 、PO 4 and SiO 4 The tetrahedron constitutes a three-dimensional non-neutral framework structure, contains exchangeable cations, and has certain acidity. At the same time, its pore size and geometric configuration are conducive to the formation and diffusion of branched-chain alkane isomers. Therefore, SAPO-41 molecular sieve is used as a bifunctional catalyst for the synthesis of metals on acidic supports in the hydroisomerization of long-chain normal alkanes. The reaction exhibited excellent cataly...

Claims

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Application Information

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