Method for synthesizing SAPO (silicoaluminophosphate)-34 molecular sieve by pre-processing silicon source through phosphoric acid

A SAPO-34, synthesis method technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem of poor solubility of silicon source, uneven distribution of silicon components, and poor catalytic performance of SAPO-34 molecular sieve Stability and other issues, to achieve the effect of changing the degree of dispersion and long life

Inactive Publication Date: 2013-07-10
NANKAI UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the SAPO-34 molecular sieve synthesis system, the solubility of the silicon source is relatively poor, especially when the silicon content is high, the silicon component is easy to enter the SAPO-34 molecular sieve structure in the form of "silicon islands

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for synthesizing SAPO (silicoaluminophosphate)-34 molecular sieve by pre-processing silicon source through phosphoric acid
  • Method for synthesizing SAPO (silicoaluminophosphate)-34 molecular sieve by pre-processing silicon source through phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First preheat 0.25mL silicon source with 1.75mL phosphoric acid at 200°C for 3-4 hours and then cool. At 20°C, dissolve 1.74g of pseudo-boehmite powder with 10mL of deionized water, then add dropwise the mixture of phosphorus source and silicon source, 4.65mL of triethylamine, stir well, transfer to a stainless steel reaction kettle for crystallization at 200°C 1 to 2 days, and then according to the conventional molecular sieve post-treatment method, cooling, washing, drying, and collecting the product.

Embodiment 2

[0016] First preheat 0.25mL silicon source with 1.75mL phosphoric acid at 200°C for 3-4 hours and then cool. At 20°C, dissolve 1.74g of pseudo-boehmite powder with 10mL of deionized water, then add dropwise the mixture of phosphorus source and silicon source, 4.65mL of triethylamine, stir well, transfer to a stainless steel reaction kettle for crystallization at 180°C 1 to 2 days, and then according to the conventional molecular sieve post-treatment method, cooling, washing, drying, and collecting the product.

Embodiment 3

[0018] First preheat 0.25mL silicon source with 1.75mL phosphoric acid at 200°C for 3-4 hours and then cool. At 20°C, dissolve 1.74g of pseudo-boehmite powder with 10mL of deionized water, then add dropwise the mixture of phosphorus source and silicon source, 4.65mL of triethylamine, stir well, transfer to a stainless steel reaction kettle for crystallization at 170°C 1 to 2 days, and then according to the conventional molecular sieve post-treatment method, cooling, washing, drying, and collecting the product.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for synthesizing a SAPO (silicoaluminophosphate)-34 molecular sieve by pre-processing a silicon source through phosphoric acid. The method adopts the phosphoric acid as the phosphorus source, adopts the pseudo-boehmite as the aluminum source, adopts the silica sol as the silicon source, and adopts the triethylamine as the template; and the method comprises the following steps: pre-heating the silicon source by phosphoric acid at 200 DEG C for 3-4 hours; preparing the synthetic gel from the mixture of the aluminum source, the phosphorus source and the silicon source, the organic template and water, wherein the molar ratio of Al2O3 to H3PO4 to SiO2 to R to H2O is 1.0:2.0(0.05-2.0):3.0(50-200); hydrothermally crystallizing the synthetic gel at 200 DEG C under the self-generated pressure for 1-2 days; and then cooling, washing with water, separating and drying at room temperature to obtain the product. The SAPO-34 molecular sieve product of which silicon is more uniformly distributed can be obtained by using the method disclosed by the invention.

Description

technical field [0001] The invention relates to the synthesis of silicoaluminophosphate molecular sieve SAPO-34. Specifically, the silicon source is first heat-treated with phosphoric acid, and then triethylamine is used as a template to synthesize the SAPO-34 molecular sieve with uniform silicon distribution. 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 microporous structure, which shows excellent catalytic performance in the reaction of methanol to light olefins. [0003] However, in the SAPO-34 molecular sieve synthesis system, the solubility of the silicon source is relatively poor, especially when the silicon content is high, the silicon component is easy to enter the SAPO-34 molecular sieve structure in the form of "silicon islands" of different ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B39/54C01B37/08
Inventor 李牛赵慧茹项寿鹤
Owner NANKAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap