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Preparation of fine grain SAPO-34 molecular sieve

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of complex synthesis process, cost increase, aging, etc., achieve large specific surface area, improve performance, The effect of uniform particle size

Inactive Publication Date: 2009-06-24
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Aging
These methods either use expensive template tetraethylammonium hydroxide, or the synthesis process is complicated, and the cost of synthesis increases

Method used

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  • Preparation of fine grain SAPO-34 molecular sieve
  • Preparation of fine grain SAPO-34 molecular sieve
  • Preparation of fine grain SAPO-34 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material pseudo-boehmite (containing Al 2 o 3 Add 5.50 g of 67.4% wt) into a 70 ml synthesis kettle, then add 16 ml of deionized water, and stir evenly. Phosphoric acid (containing H 3 PO 4 85%wt) 8.30g and deionized water 16ml. Stir vigorously for about 2 hours, then add silica sol (containing SiO 2 30%wt) 5.76g, add 10.93g of triethylamine, and stir for about 2 hours until a uniform colloid is formed. Put the reactor into the oven, raise the temperature to 110°C, keep the temperature constant for 2 hours, then raise the temperature to 200°C, keep the temperature constant for 24 hours, after cooling, separate the solid from the mother liquor, wash the solid several times with deionized water, and set the temperature at 110°C Dry in the air to obtain SAPO-34 molecular sieve raw powder. Its crystallinity and particle size are shown in Table 1.

Embodiment 2

[0027] In Example 1, only the amount of silica sol added was changed from 5.76 g to 2.88 g, and the remaining components and operations were kept unchanged to obtain a pure-phase SAPO-34 molecular sieve raw powder. Calcined at 550°C for 6 hours to obtain SAPO-34 molecular sieve. Its crystallinity and particle size are shown in Table 1.

Embodiment 3

[0029] In Example 1, only the amount of silica sol added was increased from 5.76 to 8.64 g, and the rest of the components and operations remained unchanged to obtain a pure-phase SAPO-34 molecular sieve powder. Calcined at 550°C for 6 hours to obtain SAPO-34 molecular sieve. Its crystallinity and particle size are shown in Table 1.

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Abstract

The invention relates to a method for preparing a small crystal grain SAPO-34 molecular sieve with high crystallinity and large specific surface area. The method for preparing the molecular sieve is mainly characterized in that a structure guide agent containing triethylamine and fluoride is added in the forming process of a colloid mixture; and at the same time, after an ageing process, the colloid mixture is crystallized. The SAPO-34 molecular sieve prepared by the method has the advantages of small grain diameter, large specific surface area and high crystallinity.

Description

Technical field [0001] The technical solution claimed in the present invention relates to the preparation method of aluminum phosphosilicate (SAPO compound) molecular sieve catalyst, specifically the synthesis method of silicoaluminophosphate molecular sieve SAPO-34. Background technique [0002] In 1984, the United States United Carbide Corporation (UCC) developed a series of silicoaluminophosphate molecular sieves (SAPO-n, n represents the structural model). One of the most eye-catching is SAPO-34 molecular sieve. SAPO-34 molecular sieve made of PO 4 , AlO 4 and SiO 4 The tetrahedrons are connected with each other; it has an elliptical cage and a three-dimensional pore structure composed of oxygen eight-membered rings. The shape of the oxygen eight-membered ring may be oval, circular or wrinkled, and the size of the pore varies with the shape of the oxygen eight-membered ring, but the effective diameter of the pore remains between 0.43 and 0.50 nm. The pore volume is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 袁忠勇顾建峰
Owner NANKAI UNIV
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