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

Preparation method of metal-organic framework zif-8 membrane-coated supported noble metal efficient core-shell catalyst with tunable selectivity

A technology of noble metal catalysts and metal-organic frameworks, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve wide application prospects and high selectivity

Inactive Publication Date: 2016-06-01
DALIAN UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is a new type of core-shell catalyst obtained by coating heterogeneously loaded noble metal microspheres with ZIF-8 membrane to address the disadvantages of the current preparation of heterogeneous catalysts.

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
  • Preparation method of metal-organic framework zif-8 membrane-coated supported noble metal efficient core-shell catalyst with tunable selectivity
  • Preparation method of metal-organic framework zif-8 membrane-coated supported noble metal efficient core-shell catalyst with tunable selectivity
  • Preparation method of metal-organic framework zif-8 membrane-coated supported noble metal efficient core-shell catalyst with tunable selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of Pd nanoparticles

[0030] First prepare 2mMH 2 PdCl 4 aqueous solution, and then with PVP, H 2 After mixing O and HCl, heat to boiling, add ethanol immediately, and reflux for 3h;

[0031] (2) SiO 2 Preparation of vector

[0032] According to stober method, using TEOS as silicon source, NH 4 OH is used as a catalyst, and it is hydrolyzed at room temperature for 1 hour under the mixed system of ethanol / water;

[0033](3) Combine the Pd nanoparticles obtained by method (1) with the SiO obtained by method (2) 2 Mix at room temperature for 24 hours to obtain Pd / SiO 2 catalyst;

[0034] (4) Pd / SiO obtained by method (3) 2 Mix the aqueous solution with the PDDA aqueous solution, let it stand at room temperature for 30 minutes, and then centrifugally wash it with deionized water for several times; then mix it with the PSS aqueous solution at room temperature for 30 minutes, and then centrifugally wash it with deionized water and methanol for several...

Embodiment 2

[0038] (1) Preparation of Pd nanoparticles

[0039] First prepare 2mMH 2 PdCl 4 aqueous solution, and then with PVP, H 2 After mixing O and HCl, heat to boiling, add ethanol immediately, and reflux for 3h;

[0040] (2) SiO 2 Preparation of vector

[0041] According to stober method, using TEOS as silicon source, NH 4 OH is used as a catalyst, and it is hydrolyzed at room temperature for 1 hour under the mixed system of ethanol / water;

[0042] (3) Combine the Pd nanoparticles obtained by method (1) with the SiO obtained by method (2) 2 Mix at room temperature for 24 hours to obtain Pd / SiO 2 catalyst;

[0043] (4) The catalyst obtained in method (3) was vacuum-dried overnight at 80°C and placed in a desiccator for testing.

Embodiment 3

[0045] (1) Preparation of Pd nanoparticles

[0046] First prepare 2mMH 2 PdCl 4 aqueous solution, and then with PVP, H 2 After mixing O and HCl, heat to boiling, add ethanol immediately, and reflux for 3h;

[0047] (2) SiO 2 Preparation of vector

[0048] According to stober method, using TEOS as silicon source, NH 4 OH is used as a catalyst, and it is hydrolyzed at room temperature for 1 hour under the mixed system of ethanol / water;

[0049] (3) Combine the Pd nanoparticles obtained by method (1) with the SiO obtained by method (2) 2 Mix at room temperature for 24 hours to obtain Pd / SiO 2 catalyst;

[0050] (4) Pd / SiO obtained by method (3) 2 Mix the aqueous solution with the PDDA aqueous solution, let it stand at room temperature for 30 minutes, and then centrifugally wash it with deionized water for several times; then mix it with the PSS aqueous solution at room temperature for 30 minutes, and then centrifugally wash it with deionized water and methanol for severa...

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 relates to a method for preparing a selectivity-adjustable efficient supported precious-metal core-shell catalyst coated with a metal-organic framework ZIF-8 membrane, and belongs to the technical field of new materials. The method comprises the following steps: coating a pre-prepared supported precious-metal catalyst with a ZIF-8 membrane selective-separation layer, repairing the defect of the membrane layer through polyelectrolyte, adjusting and controlling the membrane forming times to obtain continuous ZIF-8 membranes with different compactnesses, and thereby the catalyst has the adjustable high selectivity. Compared with the same kind of catalyst, the selectivity-adjustable efficient supported precious-metal core-shell catalyst has the advantages of simple preparation process, mild conditions and easiness in large-scale amplification. The selectivity-adjustable efficient supported precious-metal core-shell catalyst solves the problem that a multiphase supported precious-metal catalyst has the low selectivity to reactants and products, and simultaneously is beneficial to relieve the fact that active components of the multiphase supported precious-metal catalyst are easily lost and poisoned.

Description

technical field [0001] The invention prepares a selectivity-adjustable metal-organic framework ZIF-8 film-coated loaded noble metal high-efficiency core-shell catalyst. The main reason is that by coating a ZIF-8 membrane with molecular sieving function, the supported noble metal catalyst has high selectivity to reactants and products; at the same time, it also helps to solve the problem that the active components of heterogeneous catalysts are easy to lose and poison during the reaction. , leading to a problem of reduced activity. Background technique [0002] Nanoscale noble metal (Pd, Pt, Au, etc.) catalysts have high catalytic activity in important industrial reactions such as catalytic hydrogenation, selective oxidation, carbon monoxide conversion, and carbon-carbon coupling. Early studies focused on homogeneous systems. Although homogeneous catalysts can provide ideal activity, their recovery and separation problems restrict their application in industrial production. ...

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): B01J31/22
Inventor 张雄福林露张通刘海鸥邱介山
Owner DALIAN 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