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Method for synthesizing SAPO-34 molecular sieve by using piperazidine as template

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali exchange phosphate, can solve the problems of high dosage, affecting the number of protonic acid centers, etc., and achieve the effect of high activity

Inactive Publication Date: 2012-11-28
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of silicon source used in the existing SAPO-34 synthesis route is much higher than this, so a large amount of silicon in the molecular sieve structure is connected through the connection between silicon and silicon, and exists in the form of "silicon islands", which affects the number of protonic acid centers

Method used

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  • Method for synthesizing SAPO-34 molecular sieve by using piperazidine as template
  • Method for synthesizing SAPO-34 molecular sieve by using piperazidine as template

Examples

Experimental program
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Embodiment 1

[0014] At 20°C, dissolve 1.29g of piperazine with 15mL of deionized water, add 1.303g of pseudoboehmite powder and continue to stir after dissolving, then add 1.13mL of phosphoric acid and 2.19mL of silica sol dropwise, stir well and then transfer to a stainless steel reaction kettle Crystallize at 180°C for 5-6 days, then cool, wash, and dry according to the conventional molecular sieve post-treatment method, and collect the product.

Embodiment 2

[0016] At 20°C, dissolve 1.29g of piperazine with 15mL of deionized water, add 1.303g of pseudoboehmite powder and continue to stir after dissolving, then add 1.13mL of phosphoric acid and 2.19mL of silica sol dropwise, stir well and then transfer to a stainless steel reaction kettle Crystallize at 190°C for 5-6 days, then cool, wash, and dry according to the conventional molecular sieve post-treatment method, and collect the product.

Embodiment 3

[0018] At 20°C, dissolve 1.29g of piperazine with 15mL of deionized water, add 1.303g of pseudoboehmite powder and continue to stir after dissolving, then add 1.13mL of phosphoric acid and 2.19mL of silica sol dropwise, stir well and then transfer to a stainless steel reaction kettle Crystallize at 200°C for 5-6 days, then cool, wash, and dry according to the conventional molecular sieve post-treatment method, and collect the product.

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Abstract

The invention provides a method for synthesizing an SAPO-34 molecular sieve by using piperazidine as a template. The method comprises the following steps of: with phosphoric acid as a phosphorous source, pseudo boehmite as an aluminum source, silica solution as a silicon source, and the piperazidine as the template, preparing synthesized gel from the phosphoric acid, the aluminum source, the silicon source, an organic template and water according to the mole proportion of Al2O3 to H3PO4 to SiO2 to R to H2O of 1.0: 2.0: (0.1-1.0): 1.8: (50-150), carrying out hydrothermal crystallization on the gel at 180 DEG C under self-generated pressure for 5-6 days, cooling, washing, separating and drying under room temperature to obtain products. Through the method for synthesizing the SAPO-34 molecular sieve by using the piperazidine as the template, disclosed by the invention, an SAPO-34 molecular sieve product with higher crystallinity degree and larger crystal grains can be obtained.

Description

technical field [0001] The invention relates to the synthesis of silicoaluminophosphate molecular sieve SAPO-34. Specifically, piperazine is used as a template to synthesize the SAPO-34 molecular sieve with higher crystallinity and larger crystal particles. Background technique [0002] Silicoaluminophosphate molecular sieve SAPO-34 made of PO 4 , AlO 4 and SiO 4 The tetrahedron constitutes a three-dimensional framework structure, and the SAPO-34 molecular sieve has a medium-strength acid center and an eight-membered ring pore structure, which shows excellent catalytic performance in the reaction of methanol to light olefins. [0003] A variety of templates can be used to synthesize SAPO-34 molecular sieve, such as tetraethylammonium hydroxide, isopropylamine, dipropylamine, piperidine, morpholine, triethylamine, diethylamine, etc. and their mixtures. It is generally believed that templates play a role in structure orientation, charge matching and space filling during the...

Claims

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Application Information

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IPC IPC(8): C01B39/54
Inventor 李牛赵慧茹丁月项寿鹤
Owner NANKAI UNIV