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SAPO molecular sieve, and preparation method and purpose thereof

A molecular sieve, hollow technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem that catalyst particle size and acidity cannot reach long life, molecular sieve acid site density is low, silicon is not complete Utilization and other issues, to achieve the effect of reducing concentration and residence time, increasing utilization efficiency, and increasing lifespan

Active Publication Date: 2014-08-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the three-dimensional granular structure SAPO molecular sieve prepared by this method is generally between 4-50 μm; and the silicon in kaolin cannot fully participate in the construction of the molecular sieve structure, and a part can only exist as a matrix; the acid site density of the resulting molecular sieve The molecular sieve catalyst is relatively low, and the strength of the acid site is relatively high. During the MTO process, the molecular sieve catalyst is very easy to deposit carbon in the pores and cages.
Therefore, the particle size and acidic properties of the catalyst obtained by this method cannot meet the requirements of a long-life, high-low carbon olefin selectivity MTO efficient catalyst, and the silicon in kaolin is not fully utilized

Method used

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  • SAPO molecular sieve, and preparation method and purpose thereof
  • SAPO molecular sieve, and preparation method and purpose thereof
  • SAPO molecular sieve, and preparation method and purpose thereof

Examples

Experimental program
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Effect test

Embodiment approach

[0096] As an embodiment of the present invention, the preparation method of sheet SAPO molecular sieve of the present invention comprises the following steps:

[0097] (1) Activated layered aluminosilicate;

[0098] (2) Mix and homogenize the activated layered aluminosilicate, phosphorus source, auxiliary aluminum source, auxiliary silicon source and water to prepare a wet masterbatch; wherein, the molar ratio of Al and Si in the wet masterbatch is 1.2~100; SiO 2 、Al 2 o 3 ,P 2 o 5 、H 2 The molar ratio of O and templating agent is (0.01-2):(0.1-1.5):(0.1-1.5):(1-500):(0.1-10);

[0099] (3) After hydrothermal crystallization of the wet masterbatch, cooling, filtering, washing and drying, the obtained solid is SAPO molecular sieve raw powder;

[0100] Optionally,

[0101] (5) The raw SAPO molecular sieve powder is treated with a release agent to obtain a SAPO molecular sieve.

[0102] figure 1 It is a process flow chart of the production method of sheet-shaped SAPO mol...

Embodiment 1

[0105] A kind of preparation method of flaky SAPO molecular sieve comprises the steps:

[0106] (1) Grinding Suzhou kaolin (90.5% kaolinite content) to an average particle size of less than 0.5 μm to obtain a grinding activated powder;

[0107] (2) Take 30.0g of ground activated powder and add it to 200.0g of deionized water, then add 52.0g of 85.0% concentrated phosphoric acid, 16.4g of pseudo-boehmite (78.2% alumina content), and 60.0g of morpholine , stirred vigorously to obtain a wet masterbatch; in the wet masterbatch, SiO 2 、Al 2 o 3 ,P 2 o 5 、H 2 The mol ratio of O and templating agent is 0.210:0.231:0.226:11.111:0.689;

[0108] (3) Put 40.0g of the above wet masterbatch in a self-pressurized reaction kettle, distill and crystallize at 200°C for 20h, cool, and after solid-liquid separation, wash and dry the obtained solid, the obtained solid is hollow SAPO- 34 molecular sieve raw powder;

[0109] (4) Put the hollow SAPO-34 molecular sieve raw powder in a muffle ...

Embodiment 2

[0113] A kind of preparation method of flaky SAPO molecular sieve comprises the steps:

[0114] (1) Grinding Suzhou kaolin (90.5% kaolinite content) to an average particle size of less than 0.3 μm to obtain a grinding activated powder;

[0115] (2) Take 30.0g of ground activated powder and add it to 200.0g of deionized water, then add 52.0g of 85.0% concentrated phosphoric acid, 16.4g of pseudo-boehmite (78.2% alumina content), and 70.0g of morpholine , stirred vigorously to obtain a wet masterbatch; in the wet masterbatch, SiO 2 、Al 2 o 3 ,P 2 o 5 、H 2 The mol ratio of O and templating agent is 0.210:0.231:0.226:11.111:0.803;

[0116] (3) Put 40.0 g of the above wet masterbatch in a self-pressurized reaction kettle, distill and crystallize at 160°C for 50 days, cool, and the obtained solid is hollow SAPO-34 molecular sieve raw powder;

[0117] (4) Put the hollow SAPO-34 molecular sieve raw powder in a muffle furnace, raise the temperature to 900°C in flowing air at 0.1...

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Abstract

The invention discloses an SAPO molecular sieve, which has hollow single crystals. The SAPO molecular sieve has optional pore structure, adjustable silicon content and distribution, controllable strength and density of acid site, and long service life of catalyst. The invention also discloses a preparation method of the SAPO molecular sieve. The method uses layered silicate as a raw material, which is subjected to activation, and mixed and homogenized with a phosphorus source, an auxiliary aluminum source and water to obtain a wet masterbatch; and the wet masterbatch is subjected to hydrothermal crystallization to obtain a raw powder of the hollow SAPO molecular sieve, wherein the molar ratio of Al and Si in the wet masterbatch is higher than 1. The method use easily available raw materials, has low cost and can be prepare the SAPO molecular sieve with hollow structure.

Description

technical field [0001] The invention relates to a SAPO molecular sieve and its preparation method and application, in particular to a hollow SAPO molecular sieve and its preparation method and application. Background technique [0002] Silicoaluminophosphate molecular sieve, also known as SAPO molecular sieve, is made of SiO 2 , AlO 2 - and PO 2 + A crystal composed of three tetrahedral periodic arrangements. There are many types of SAPO series structures, which can be divided into micro-pore structures (such as SAPO-20, 25, 28, etc.) and small-pore structures (such as SAPO-17, 18, 26, 34, 43, 44, 47, etc.) according to the pore size. , medium pore structure (such as SAPO-11, 31, 42, etc.), macroporous structure (such as SAPO-5, 36, 46, etc.) and ultra-large pore structure (such as SAPO-8, VPI-5, etc.) five structures. [0003] SAPO molecular sieves have variable chemical composition, adjustable acid site density and strength, large specific surface area, special pore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/08C01B39/54B01J29/85
Inventor 卢旭晨王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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