Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Double-micropore zeolites and method of making thereof

A microporous zeolite and zeolite technology, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problem that the repeatability of synthesizing double microporous molecular sieves is difficult to control, and the amount of additional aluminum source and alkali is difficult to grasp. and other problems, to achieve good thermal and hydrothermal stability, strong acidity, and the effect of improving Si/Al ratio

Inactive Publication Date: 2007-11-28
TAIYUAN UNIV OF TECH
View PDF1 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our research group adopted two-step crystallization and successfully prepared a double-microporous molecular sieve (patent authorization number: ZL200410012333.2) that organically combines Y and Beta zeolites. It is characterized in that the zeolite synthesized in the first step is used as the second During the two-step synthesis of raw materials, it is required to pour part of the clear liquid. Since the clear liquid contains silicon, aluminum, alkali and other components, it is difficult to control the amount of aluminum source and alkali added in the second step of synthesis, resulting in the synthesis of double micropores. The repeatability of molecular sieve is not easy to control

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
  • Double-micropore zeolites and method of making thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] Step 1: Mix 17.4g TEABr (tetraethylammonium bromide), 6ml concentrated ammonia water, 2.26g sodium metaaluminate, 0.5g NaOH, 31ml silica sol, and 34ml distilled water to form a uniform white jelly, and put it into 100ml stainless steel In the reaction kettle, crystallize at 140°C for 10 days and take it out for use. The molar ratio of the original material of Beta zeolite is: 2.2Na 2 O: 20SiO 2 :Al 2 o 3 : 4.6 (TEA) 2 O: 4.6 (NH 4 ) 2 O: 440H 2 O.

[0019] The second step: Add 2.35g sodium metaaluminate, 1.31g sodium hydroxide, and 2.5mlY directing agent to the solid-liquid mixture containing Beta zeolite synthesized above, and the total molar ratio of materials is: 2.62Na 2 O:Al 2 o 3 : 9.7SiO2 2 : 2.32 (TEA) 2 O: 2.32 (NH 4 ) 2 O: 215H 2 O. Then mix and stir evenly, put it into a 100ml stainless steel reaction kettle, crystallize at 85°C for 24h, take it out, then cool it with tap water at room temperature, then wash it with distilled water until neutra...

Embodiment approach 2

[0021]Step 1: Mix 17.4g TEABr (tetraethylammonium bromide), 6ml concentrated ammonia water, 2.26g sodium metaaluminate, 0.5g NaOH, 31ml silica sol, and 34ml distilled water to form a uniform white jelly, and put it into 100ml stainless steel In the reaction kettle, crystallize at 145°C for 8 days and take it out for use. The molar ratio of the original material of Beta zeolite is: 2.2Na 2 O: 20SiO 2 :Al 2 o 3 : 4.6 (TEA) 2 O: 4.6 (NH 4 ) 2 O: 440H 2 O.

[0022] The second step: Add 2.97g sodium metaaluminate, 1.31g sodium hydroxide, and 3.5mlY directing agent to the solid-liquid mixture containing Beta zeolite synthesized above, and the total material molar ratio is: 2.47Na 2 O:Al 2 o 3 : 8.55SiO2 2 : 2.04 (TEA) 2 O: 2.04 (NH 4 ) 2 O: 190H 2 O. Mix and stir to form a uniform white substance, put it into a 100ml stainless steel reaction kettle, crystallize at 90°C for 24 hours, take it out, then cool it with tap water at room temperature, then wash it with distil...

Embodiment approach 3

[0024] Step 1: Mix 17.4g TEABr (tetraethylammonium bromide), 6ml concentrated ammonia water, 2.26g sodium metaaluminate, 0.5g NaOH, 31ml silica sol, and 34ml distilled water to form a uniform white jelly, and put it into 100ml stainless steel In the reaction kettle, crystallize at 135°C for 13 days and take it out for use. The molar ratio of the original material of Beta zeolite is: 2.2Na 2 O: 20SiO 2 :Al 2 o 3 : 4.6 (TEA) 2 O: 4.6 (NH 4 ) 2 O: 440H 2 O.

[0025] The second step: Add 3.15g of sodium metaaluminate, 1.07g of sodium hydroxide, and 3.5ml of Y-directing agent to the solid-liquid mixture containing Beta zeolite synthesized above. The total molar ratio of materials is: 2.30Na 2 O:Al 2 o 3 : 8.27SiO2 2 : 1.98 (TEA) 2 O: 1.98 (NH 4 ) 2 O: 184H 2 O. Mix and stir to form a uniform white substance, put it into a 100ml stainless steel reaction kettle, crystallize at 90°C for 24 hours, take it out, then cool it with tap water at room temperature, then wash it...

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 double microporous zeolite and its preparation process belongs to the field of fine chemical technology. The preparation process is one two step crystallizing process including the first step of synthesizing Beta, and the second step of preparing composite zeolite product in BEA / FAU structure with the Beta as material and through replenishing aluminum source, regulating basicity of the system, adding guiding agent, filtering, washing, drying and roasting. The composite zeolite product has strong acidity, and excellent heat and hydrothermal stability, and may be applied as catalyst, co-catalyst and adsorbent in petrochemical industry.

Description

1. Technical field [0001] The invention relates to a double-microporous zeolite and a preparation method thereof, which belong to the technical field of fine chemicals, and specifically relate to a two-step crystallization method to organically combine two microporous zeolites of Beta and Y to form a double-microporous zeolite. A technical solution for a new type of zeolite material with a microporous structure. 2. Technical background [0002] Y-type molecular sieves and their modified products show excellent catalytic performance in reactions such as catalytic cracking, hydrocracking, hydroisomerization, alkane aromatization, and alkylation (M.A.Saberi, R.Le Van Mao, M.A. . Martin, A.W.H. Mak. Applied Catalysis A: General 214 (2001); I.P. Dzikh, J.M. Lopes, F. Lemos, F. Ribeiro.CatalysisToday 65(2001); Wei Ruiping, Wang Jun, Ren Xiaoqian, etc. Journal of Inorganic Chemistry. 12(2004); A.M.Radwan, zhang-GuoZhang, P.Chambrion, et al.Fuel Processing Technology 55(1998).), i...

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): B01J29/06B01J29/08
Inventor 李瑞丰郑家军张喜文郭群于峰凌凤香马静红孙万付
Owner TAIYUAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com