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

A kind of acidity adjustment method of MFI type molecular sieve

A technology of acidity adjustment and molecular sieve, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problem of uneven distribution of mesopores, achieve uniform distribution of mesopores, stable structure, and good application prospects Effect

Active Publication Date: 2022-01-11
GUANGDONG UNIV OF TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is the mesopore obtained by the hard template method, and the mesopore distribution is uneven.

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
  • A kind of acidity adjustment method of MFI type molecular sieve
  • A kind of acidity adjustment method of MFI type molecular sieve
  • A kind of acidity adjustment method of MFI type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The acidity adjustment method of a kind of MFI type molecular sieve that present embodiment provides, comprises:

[0033] 1. Preparation of sheet MFI molecular sieves

[0034] With 0.04mol SiO 2 As a benchmark, NaOH, NaAlO 2 , template agent (tetraammonium base head Bola type surfactant C 6-6-12 Br 4 ) and tetraethyl orthosilicate were dissolved in water, stirred at 600rpm magnetically for 30min at room temperature until uniform, and obtained a precursor solution with a molar ratio of 16.28Na 2 O:125SiO 2 :2.0Al 2 o 3 :5C 6-6-12 Br 4 :5000H 2 O: Transfer the precursor solution A to a reaction kettle for crystallization at 150°C for 7 days, filter the reactant, collect the filter residue and dry it in a vacuum oven at 120°C for 10 hours to obtain a sheet MFI molecular sieve.

[0035] The above-mentioned preparation process specifically refers to the following documents:

[0036] B. Liu, Q. Duan, C. Li et al. Template synthesis of the hierarchically structured ...

Embodiment 2

[0042] The acidity adjustment method of a kind of MFI type molecular sieve that present embodiment provides, comprises:

[0043] 1. Preparation of sheet MFI molecular sieves

[0044] This step is the same as that of Embodiment 1, and will not be repeated one by one.

[0045] 2. Preparation of H + Lamellar MFI Molecular Sieve

[0046] The sheet MFI type molecular sieve and 1.2mol / L NH 4 NO 3 The solutions were mixed, and the mixed solution was refluxed at 80°C for 3 times, refluxed for 10 hours each time, then filtered, washed, dried, and roasted to obtain H + Type sheet MFI type molecular sieve. Among them, sheet MFI type molecular sieve and NH 4 NO 3 The mixing mass ratio of the solution is 1:20.

[0047] 3. Acidity adjustment

[0048] Take 1.2g of H + The type sheet MFI molecular sieve was put into a tube furnace and heated to 800 °C at a heating rate of 5 °C / min, and then NH 3 and N 2 The mixed gas (NH 3 Accounting for 10% of the total mixed gas, the total gas ...

Embodiment 3

[0050] The acidity adjustment method of a kind of MFI type molecular sieve that present embodiment provides, comprises:

[0051] 1. Preparation of sheet MFI molecular sieves

[0052] This step is the same as that of Embodiment 1, and will not be repeated one by one.

[0053] 2. Preparation of H + Lamellar MFI Molecular Sieve

[0054] The sheet MFI type molecular sieve and 1.2mol / L NH 4 NO 3 The solutions were mixed, and the mixed solution was refluxed at 80°C for 3 times, refluxed for 10 hours each time, then filtered, washed, dried, and roasted to obtain H + Type sheet MFI type molecular sieve. Among them, sheet MFI type molecular sieve and NH 4 NO 3 The mixing mass ratio of the solution is 1:20.

[0055] 3. Acidity adjustment

[0056] Take 1.2g of H + The type sheet MFI molecular sieve was put into a tube furnace and heated to 800 °C at a heating rate of 5 °C / min, and then NH 3 and N 2 The mixed gas (NH 3 Accounting for 10% of the total mixed gas, the total gas ...

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 application belongs to the technical field of molecular sieve modification, and in particular relates to a method for adjusting the acidity of an MFI type molecular sieve. The acidity adjustment method provided by the present invention comprises: heating the lamellar MFI type molecular sieve subjected to ammonium ion exchange to the roasting temperature, 3 and N 2 It was calcined under a mixed atmosphere of , and then cooled to room temperature under a nitrogen atmosphere. The method of the invention can not only keep the morphology and pore structure of the lamellar catalyst intact, but also can control the acidity of the lamellar MFI molecular sieve by adjusting the nitrogen doping conditions; it is suitable for both small molecule catalysis and macromolecule catalysis, Easy to operate. Controlling the moderate acidity of the molecular sieve by the above method is beneficial to suppress the side reaction and improve the selectivity of the main reaction, and has good application prospects in catalytic cracking, heavy oil cracking and alkylation reactions.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve modification, and in particular relates to a method for adjusting the acidity of an MFI molecular sieve. Background technique [0002] In the acid-catalyzed reaction, two key factors affecting the performance of the catalytic reaction are: one is mass transfer resistance; the other is acidity. However, traditional MFI-type molecular sieves are mainly micropores, with large grain size and large diffusion resistance of macromolecules in the crystal, which is easy to generate carbon deposits, which shortens the catalytic life of molecular sieves. [0003] Sheet molecular sieve is a layered crystal material with a pore opening system on the plane perpendicular to the sheet. It has a small thickness of the molecular sieve crystal layer, which can effectively shorten the molecular diffusion path, increase the molecular mass transfer rate and expose more accessible active sites, thereby improvin...

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 Patents(China)
IPC IPC(8): C01B39/38B01J29/70
CPCC01B39/40B01J29/70C01P2004/03C01P2002/72C01P2002/82B01J2229/18
Inventor 方岩雄陈志鹏刘宝玉蔡晓兰林文杰潘晨倩麦继锦高恒志谢凯宏
Owner GUANGDONG 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