SAPO-31 molecular sieve and preparation method thereof

A SAPO-31, molecular sieve technology, applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of SAPO-31 high cost, complicated operation, long crystallization time, etc., to achieve a wide acid density And acid strength adjustable range, simple preparation process, easy to operate effect

Active Publication Date: 2013-03-27
HEILONGJIANG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention aims to solve the problem that existing SAPO-31 molecular sieve preparation methods have long crystallization time, low yield, complex operation, and inability to carry out large-scale production. The prepared SAPO-31 has high cost and is prone to SAPO- 5 mixed crystals, SAPO-11 mixed crystals and SiO 2 To solve the problem of miscellaneous crystals, a new preparation method of SAPO-31 molecular sieve is provided

Method used

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  • SAPO-31 molecular sieve and preparation method thereof
  • SAPO-31 molecular sieve and preparation method thereof
  • SAPO-31 molecular sieve and preparation method thereof

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specific Embodiment approach 1

[0019] Specific embodiment one: This embodiment provides a SAPO-31 molecular sieve, which is prepared from phosphoric acid, pseudo-boehmite, silica sol and di-n-butylamine; wherein, the mass ratio of pseudo-boehmite to phosphoric acid is ( 0.40~0.70):1, the mass ratio of silica sol to phosphoric acid is (0.30~0.90):1, and the mass ratio of di-n-butylamine to phosphoric acid is (0.50~0.90):1.

[0020] This embodiment has the following advantages: 1. The SAPO-31 molecular sieve provided by this embodiment adopts cheap pseudo-boehmite and silica sol as aluminum source and silicon source respectively, and adopts cheap di-n-butylamine as template agent, The prepared SAPO-31 molecular sieve is not only low in cost, but also due to the use of di-n-butylamine as a template, the synthesized SAPO-31 molecular sieve is not prone to SAPO-5, SAPO-11 and SiO 2 Miscellaneous crystals; 2. The SAPO-31 molecular sieve provided by this embodiment has a wider range of silicon-aluminum ratio, so t...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass percent concentration of phosphoric acid is 85%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: this embodiment is the method for preparing a kind of SAPO-31 molecular sieve described in specific embodiment one, specifically completes according to the following steps:

[0023] 1. Add pseudo-boehmite, silica sol, di-n-butylamine and water to phosphoric acid, and stir at a stirring rate of 800r / min~1000r / min for 5h~7h to obtain an initial gel; among them, pseudo-boehmite The mass ratio of silica sol to phosphoric acid is (0.40~0.70):1, the mass ratio of silica sol to phosphoric acid is (0.30~0.90):1, the mass ratio of di-n-butylamine to phosphoric acid is (0.50~0.90):1, water and The mass ratio of phosphoric acid is (2.0~4.0):1;

[0024] 2. Add the initial gel obtained in step 1 into a crystallization kettle, crystallize at a temperature of 170°C~190°C for 2h~48h, cool to 20°C~25°C, and obtain a solid-liquid mixture. The mixture is centrifuged, washed, and dried at a temperature of 100°C to 120°C for 10h to 24h to obtain a solid;

[0025...

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Abstract

An SAPO-31 molecular sieve and a preparation method thereof relate to a molecular sieve and a preparation method thereof. The invention aims to solve problems in an existing preparation method of the SAPO-31 molecular sieve, such as long crystallization time, low yield, complex operation, unsuitability for mass production, high cost of the prepared SAPO-31, and easy generation of SAPO-5 mixed crystal, SAPO-11 mixed crystal and SiO2 mixed crystal. The SAPO-31molecular sieve is prepared from phosphoric acid, pseudoboehmite, silica sol and di-n-butylamine. The preparation method comprises steps of: 1. initial gel preparation; 2. crystallization; and 3. roasting to obtain the SAP-O31 molecular sieve. The invention is applicable to the fields of catalyst and petrochemical processing.

Description

technical field [0001] The invention relates to a SAPO-31 molecular sieve and a preparation method thereof. Background technique [0002] The silicoaluminophosphate SAPO-31 molecular sieve with twelve-membered ring one-dimensional channel structure (ATO-type topology, channel size is 0.54×0.54nm), due to the confinement effect of its channels, is beneficial to the single The formation of branched chain isomers limits the formation of double branched or multi-branched isomers with relatively large molecular dynamics sizes. Because SAPO-31 molecular sieve has a suitable pore structure size and mild and adjustable acidity, SAPO-31 molecular sieve is used as an acidic carrier to carry noble metal / non-precious metal. The reaction showed good catalytic activity and isomerization selectivity. [0003] At present, in the preparation method of SAPO-31 molecular sieve, expensive and unsafe aluminum isopropoxide is used as aluminum source, silicon aerosol with higher price is used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 吴伟张瑞赵爱娟吴会敏
Owner HEILONGJIANG UNIV
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