MWW-structure molecular sieve and preparation method thereof

A molecular sieve and desorption technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of molecular sieve framework damage, poor controllability of desiliconization, etc., and achieve the effect of crystal particle dispersion and increased disorder.

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
View PDF12 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The post-treatment of molecular sieves with MWW structure mostly focuses on the treatment of inorganic alkali NaOH. Due to the strong alkalinity of NaOH, the controllability of desi

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
  • MWW-structure molecular sieve and preparation method thereof
  • MWW-structure molecular sieve and preparation method thereof
  • MWW-structure molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] In the preparation method provided by the present invention, R1 / SiO in said mixture 2 =0.05~0.5, R2 / SiO 2 =0~0.5, namely R2 / SiO 2 When the endpoint value of the range is zero, it means that the nitrogen-containing organic base R1 can be used alone. The method of using the nitrogen-containing organic base R1 alone is especially suitable for the complete crystallization of the raw material MWW molecular sieve. For example, the relative crystallinity of the raw material MWW structure molecular sieve is generally required to be ≥100%. This method can achieve a significant increase in the specific surface area, pore volume and 2,4,6-trimethylpyridine adsorption capacity of the MWW structure molecular sieve product sample under the premise of a slight decrease in crystallinity.

[0037] In the preparation method provided by the present invention, the simultaneous treatment of nitrogen-containing organic base R1 and organic amine R2 is particularly suitable for molecular sieve of ...

Example Embodiment

[0051] Example 1

[0052] This example illustrates the molecular sieve and preparation method provided by the present invention.

[0053] In the above comparative example 1, the MCM-22 sample without calcination and containing hexamethyleneimine is MCM-22P molecular sieve, and the MCM-22 sample after calcination and hexamethyleneimine has been removed is MCM-22C molecular sieve .

[0054] Add tetraethylammonium hydroxide solution (TEAOH, 25wt.%) into deionized water, then add MCM-22P or MCM-22C molecular sieve to the above solution, continue to stir evenly, the resulting mixture colloid molar ratio is SiO 2 : 0.1TEAOH: 15H 2 O. Transfer the obtained mixture colloid to a closed crystallization kettle, dynamically crystallize at a crystallization temperature of 150°C for 16 hours, take out the product after cooling, filter, wash, dry and roast to obtain the processed molecular sieve powder, MCM-22P The number of the corresponding processed sample is A-1-1; the number of the processed...

Example Embodiment

[0067] Example 2

[0068] This example illustrates the molecular sieve and preparation method provided by the present invention.

[0069] Tetraethylammonium hydroxide solution (25wt.%) was added to deionized water, and then MCM-49 containing hexamethyleneimine without being calcined in Comparative Example 2 was added to the above solution, and stirring was continued. The resulting mixture colloid molar ratio is SiO 2 : 0.1TEAOH: 15H 2 O. Then, the obtained mixture was transferred to a closed crystallization kettle, the crystallization temperature was 150°C, and the dynamic crystallization was performed for 16 hours. After cooling, the product was taken out. After filtering, washing, drying and roasting, the modified molecular sieve powder was obtained. Sample number It is A-2-1.

[0070] Same as above, the difference is that the MCM-49 of Comparative Example 2 that has not been calcined and contains hexamethyleneimine is replaced with the MCM-49 of Comparative Example 2 that has be...

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

PropertyMeasurementUnit
Pore volumeaaaaaaaaaa
Adsorption capacityaaaaaaaaaa
Adsorption capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a molecular sieve with a MWW structure, which is characterized in that the nitrogen adsorption-desorption BJH curve of the molecular sieve shows that the nitrogen desorption amount at 3.8±0.5nm is 0.01-0.10cm 3 /g, and the adsorption capacity of 2,4,6-collidine after adsorption at 20°C and desorption at 200°C is ≥35 μmol/g.

Description

technical field [0001] The present invention relates to a molecular sieve and its preparation method, more specifically to a MWW structure molecular sieve and its preparation method. Background technique [0002] Molecular sieves with MWW structure include MCM-22, MCM-49, MCM-36, MCM-56, SSZ-25, ITQ-1, ITQ-2 and UZM-8 and other molecular sieves. In 1990, Mobil Corporation first used hexamethyleneimine as a template to hydrothermally synthesize MCM-22 molecular sieve (US, 4954325, 1990), and first analyzed its structure in 1994, and named it MWW structure molecular sieve. Therefore, layered molecular sieves with MWW topology are also called MCM-22 family molecular sieves. [0003] Molecular sieves with MWW structure have two sets of independent channels that do not intersect each other: the elliptical 10MR two-dimensional sinusoidal channel with a pore diameter of 0.40×0.59nm in the layer; the 12MR supercage with a pore size of 0.40×0.54nm The 10MR opening of the supercage ...

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): C01B39/04
Inventor 邢恩会石艳春谢文华张凤美慕旭宏刘强王卫东秦凤明舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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