ZSM-5 molecular sieve and preparation method thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem that the uniformity of ZSM-5 grain size is not very high, the degree of crystallinity is reduced, Small crystal grains and other problems, to achieve the effect of simplified particle size control means, wide range of silicon-aluminum ratio, and less structural defects

Inactive Publication Date: 2014-12-24
PETROCHINA CO LTD
View PDF7 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The ZSM-5 molecular sieves synthesized in the above documents generally have relatively small grains, and often need to add seeds, or add other auxiliary components such as surfactants, organic additives, etc. during the synthesis process, making the synthesis process more complicated
In addition, the silicon-aluminum ratio of the molecular sieve synthesized by the above synthesis method is narrow, and with the decrease of the silicon-aluminum ratio, the crystallinity decreases significantly.
At the same time, the ZSM-5 grain size uniformity in the same sample prepared by it is not very high, which is unfavorable for exploring the influence of grain size on catalytic performance.

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
  • ZSM-5 molecular sieve and preparation method thereof
  • ZSM-5 molecular sieve and preparation method thereof
  • ZSM-5 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The invention provides a method for preparing ZSM-5 molecular sieves with different grain sizes and uniform grain sizes, different silicon-aluminum ratios and high crystallinity, characterized in that the molecular sieve shape remains unchanged, and the grain size is 500nm ~50μm, the ratio of silicon to aluminum can range from 27 to pure silicon, and the crystallinity is above 100%. Its preparation method comprises the following steps:

[0020] Using silicon source, aluminum source, template agent, potassium source and water as raw materials, it is synthesized under hydrothermal conditions. The specific steps are, the silicon source is SiO 2 Al 2 o 3 In terms of templating agent TPA + In terms of potassium source in K + The meter and water are mixed evenly according to the molar ratio of silicon source: aluminum source: template agent: potassium source: water = 1:0~0.075:0.02-1:0-5:5-100, at a temperature of 120-200°C Crystallize for 8-180 hours, and calcinate the...

Embodiment 1

[0024] This example is used to illustrate the preparation method of ZSM-5 molecular sieve.

[0025] Silica gel (as SiO 2 in terms of), pseudoboehmite (in terms of Al 2 o 3 In terms of), template agent tetrapropylammonium bromide (TPA + In terms of), potassium hydroxide (in K + meter) with water in accordance with SiO 2 :Al 2 o 3 : TPABr: KOH: water = 1: 0.02: 0.5: 0.25: 35 molar ratio after mixing evenly, dynamic crystallization at 120°C for 3 days, take out and wash, dry at 100°C for 6 hours, then bake at 550°C for 6 hours, Product Z1 is obtained. Measure the relative crystallinity and average particle diameter of this product Z1, list in Table 1. For the XRD spectrum of Z1, see figure 1 ,pass figure 1 It can be seen from the XRD spectrum that Z1 is a ZSM-5 molecular sieve.

Embodiment 2

[0027] This example is used to illustrate the preparation method of ZSM-5 molecular sieve.

[0028] Silica gel (as SiO2 in terms of), pseudoboehmite (in terms of Al 2 o 3 Calculated), template agent tetrapropylammonium hydroxide (TPA + In terms of), potassium chloride (in K + meter) with water in accordance with SiO 2 :Al 2 o 3 : TPABr: KOH: water = 1: 0.02: 0.5: 5: 35 molar ratio after mixing evenly, dynamic crystallization at 140 ° C for 4 days, take out and wash, dry at 100 ° C for 6 hours, then bake at 550 ° C for 6 hours, Product Z2 is obtained. Determination of the relative crystallinity and average particle size of the sample is listed in Table 1. According to the XRD spectrum of Z2, Z2 is a ZSM-5 molecular sieve.

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
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a ZSM-5 molecular sieve and a preparation method thereof. The preparation method comprises the following steps: according to the amounts of SiO2 of a silicon source, Al2O3 of an aluminum source, the TPA<+> of a template agent and the K<+> of a potassium source, uniformly mixing the silicon source, the aluminum source, the template agent, the potassium source and water in a mole ratio of 1: (0-0.075):(0.02-1):(0-5):(5-100), crystallizing for 8-180 hours at 120-200 DEG C, washing a solid product which is obtained through crystallization till the filtrate is neutral, drying and calcining, thereby obtaining the ZSM-5 molecular sieve, wherein the template agent is tetrapropylammonium hydroxide. According to the method, K<+> is adopted to effectively introduce the aluminum source into a zeolite molecular sieve, the crystal particle size of the prepared product is 500nm to 50mu m, the particle size is controllable and uniform, the silicon-aluminum ratio can be adjusted from 27 to pure silicon, the crystallization degree of the product is high, and the material can be widely used in multiple fields such as petrochemical engineering, adsorption separation and catalytic synthesis.

Description

technical field [0001] The invention relates to a ZSM-5 molecular sieve with a grain size between 500nm and 50μm, a silicon-aluminum ratio ranging from 27 to pure silicon, and a crystallinity of over 100% and a preparation method thereof. Background technique [0002] ZSM-5 molecular sieve was first invented in 1972 by Mobil Petroleum Company of the United States (US3702886). The molecular sieve has a three-dimensional intersecting channel system, and its pore window is a 10-membered ring. It belongs to a mesoporous zeolite. The entrance and exit channels provide a basis for the preparation of industrial catalysts with high selectivity, high activity, and strong anti-coking deactivation performance. At present, ZSM-5 and modified ZSM-5 are widely used in petrochemical fields such as shape-selective cracking, alkylation, isomerization, disproportionation dewaxing, and etherification of hydrocarbons. The high-silicon or even pure-silicon ZSM-5 molecular sieve has strong hydr...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
Inventor 李兆飞王骞刘其武高晓慧王晓化朱晓晓阎立军庞新梅李发永崔岩
Owner PETROCHINA CO LTD
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