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SAPO molecular sieve, and preparation method and purpose thereof

A molecular sieve, sheet-like structure technology, applied in molecular sieve and alkali-exchanged phosphate, molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of complex maintenance and operation, large investment, difficult to achieve, etc., to increase utilization efficiency , low energy consumption and improved efficiency

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

However, large-scale microwave heating high-pressure reaction equipment requires a large investment, is difficult to implement, and is relatively complicated to maintain and operate.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0101] As an embodiment of the present invention, the preparation method of sheet SAPO molecular sieve of the present invention comprises the following steps:

[0102] (1) Activated layered aluminosilicate;

[0103] (2) Mix and homogenize the activated layered aluminosilicate, phosphorus source, auxiliary aluminum source, auxiliary silicon source and water to prepare a wet masterbatch; wherein, SiO in the wet masterbatch 2 、Al 2 o 3 ,P 2 o 5 、H 2 The molar ratio of O and template is (0.01-2):(0.1-1.5):(0.1-1.5):(1-500):(0-10);

[0104] (3) Dry and grind the wet masterbatch to obtain dry masterbatch powder;

[0105] (4) Place the dry masterbatch powder above the templating agent aqueous solution with a concentration of 0-90w%, raise the temperature to 160-370°C, and carry out distillation and crystallization by relying on the steam of the templating agent aqueous solution; distill and crystallize the dry masterbatch powder Obtain SAPO molecular sieve raw powder;

[0106...

Embodiment 1

[0114] A kind of preparation method of flaky SAPO molecular sieve comprises the steps:

[0115] (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;

[0116] (2) Take 30.0g of grinding activation 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), 20.0g of morpholine, Stir 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 0.244:0.248:0.226:11.54:0.230;

[0117] (3) Evaporate the above wet masterbatch to dryness in an oven at 120°C, and grind it until the average particle size is less than 50 μm to obtain dry masterbatch powder;

[0118] (4) Place 10.0 g of the above-mentioned dry masterbatch powder above 50 mL of 40.0% morpholine aqueous solution, distill and crystallize at 200 ° C for 120 h, and cool...

Embodiment 2

[0123] A method for preparing sheet-like SAPO molecular sieves, using Example 1 to prepare the solution of distillation and crystallization after rhombohedral sheet-like SAPO-34 molecular sieves, and continue to place 10.0 g of dry masterbatch powder (the same proportion as in Example 1) In the upper part of the still, keep the morpholine solution in the lower part of the still from being taken away, distill and crystallize at 200 ° C for 120 hours, cool, and the solid is rhombohedral or flaky SAPO-34 molecular sieve raw powder.

[0124] Put the raw molecular sieve powder in a muffle furnace, raise the temperature to 550°C at 2°C / min in flowing air, keep it warm for 4 hours, perform template removal treatment, and cool naturally to room temperature to obtain rhombohedral flaky SAPO-34 molecular sieve.

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Abstract

The invention discloses an SAPO molecular sieve, which has single crystals in sheet structure. The SAPO molecular sieve has moderate pore size, and can be used as a catalyst with long service life for olefin preparation from methanol. The invention also discloses a preparation method of the SAPO molecular sieve. The method us as below: activating a raw material of layered aluminosilicate, mixing the raw material with an phosphorus source and water, and homogenizing to obtain a wet masterbatch; drying and grinding the wet masterbatch to obtain a dry powder; and finally distilling the dry powder for crystallization, so as to obtain a raw powder for sheet SAPO molecular sieve. The method requires addition of a template agent, realizes low cost synthesis of SAPO molecular sieve and high additional value utilization of natural layered aluminosilicate, accelerates the rate of diffusion of various substances in the channels of the molecular sieve, increases the diffusion efficiency, and the advanategs of low equipment investment, simple operation and environment-friendliness.

Description

technical field [0001] The invention relates to a SAPO molecular sieve and its preparation method and application, in particular to a sheet-like 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 with various crystal structures and regular channels composed of three tetrahedrons. There are many types of SAPO series structures, which can be divided into micro-pore structure (such as SAPO-20, 25, 28, etc.), small-pore structure (such as SAPO-17, 18, 26, 34, 43, 47, etc.), 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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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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