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Synthetic method of SAPO-5 and SAPO-34 symbiotic molecular sieves

A technology of SAPO-34 and SAPO-5, which is applied in the synthesis of SAPO-5 and SAPO-34 symbiotic molecular sieves, can solve the problems of low activity and single pore size of porous materials, and achieve good catalytic performance

Inactive Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem that the porous material synthesized in the prior art has a single pore size and low activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 12.7g phosphoric acid (containing H 3 PO 4 85%) mixed with 36g deionized water, add triethylamine 6.6g under stirring, add 10.5g silica sol (containing SiO 2 25%), finally add 7.2g pseudo-boehmite powder, after fully mixing, this mixture is moved into the synthesis kettle and sealed. Crystallize at 200°C under its own pressure for 24 hours, wash the solid product with deionized water until it is neutral, and dry it in air at 100°C to obtain SAPO-5 and SAPO-34 symbiotic molecular sieves. Quantification by XRD diffraction shows that the weight percentage of SAPO-5 in the intergrown molecular sieve is 40.8%, and the weight percentage of SAPO-34 is 59.2%.

Embodiment 2

[0019] In Example 1, only the amount of phosphoric acid was changed to 8.6g, and the rest of the composition and operating conditions remained unchanged, and the products were SAPO-5 and SAPO-34 symbiotic molecular sieves. Quantification by XRD diffraction shows that the weight percentage of SAPO-5 in the intergrown molecular sieve is 45.6%, and the weight percentage of SAPO-34 is 54.4%.

Embodiment 3

[0021] In Example 1, only the amount of triethylamine was changed to 8.5 g, and the rest of the composition and operating conditions remained unchanged, and the product was SAPO-5 and SAPO-34 symbiotic molecular sieves. Quantification by XRD diffraction shows that the weight percentage of SAPO-5 in the intergrown molecular sieve is 338%, and the weight percentage of SAPO-34 is 66.2%.

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PUM

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Abstract

The invention relates to a synthetic method of SAPO-5 and SAPO-34 symbiotic molecular sieves and mainly solves the problems of single aperture and low activity of a porous material synthesized by the prior art. The synthetic method provided by the invention comprises the following steps of: using a phosphor source, an aluminium source, a silicon source and an organic template as raw materials, mixing the raw materials according to a certain proportion to form a mixed solution, and carrying out hydrothermal crystallization to obtain a series of SAPO-5 and SAPO-34 symbiotic molecular sieves. The synthesized symbiotic molecular sieves have the following molar ratio: AlO3: P2O5: SiO2: R: H2O=1: 0.2-1-2: 0.1-2.0: 0.5-2.5: 20-100, wherein R is the organic template. The technical scheme provided by the invention greatly solves the problems, and can be used in the industrial production of low carbon olefin prepared by methanol.

Description

technical field [0001] The invention relates to a synthesis method of SAPO-5 and SAPO-34 symbiotic molecular sieves. Background technique [0002] In 1984, Lok et al first introduced Si into AlPO 4 Among the series of molecular sieves, a new class of silicoaluminophosphate (SAPO-n) molecular sieves was synthesized. This type of molecular sieves includes 13 kinds of three-dimensional microporous framework structures composed of tetrahedrons, some of which are new structures, and some are similar to conventional zeolites. It has a pore structure ranging from six-membered rings to twelve-membered rings, and the pore diameter is between 0.3 and 0.8nm, so it can meet the requirements of adsorption and diffusion of molecules of different sizes. Sialuminophosphate molecular sieve (SAPO-n) is made of SiO 2 , AlO 2 - and PO 2 + A microporous crystal composed of three tetrahedral units, where n represents a different crystal structure. There are many types of structures in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 赵昱刘红星方敬东王伟
Owner CHINA PETROLEUM & CHEM CORP
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