A kind of preparation method of single-atom dispersed palladium-based catalyst and its catalytic application

A technology of atomic dispersion and catalyst, which is applied in the application field of single-atom dispersion palladium-based catalyst and its catalytic alkyne selective hydrogenation reaction, can solve the problems of low selectivity and low activity, and achieve improved selectivity and activity, high catalytic Effect of activity and selectivity, excellent catalytic activity and selectivity

Active Publication Date: 2020-01-21
BEIJING UNIV OF CHEM TECH
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a single-atom dispersed palladium-based catalyst and its preparation method and use method to solve the problems of low selectivity and low activity of existing palladium-based 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
  • A kind of preparation method of single-atom dispersed palladium-based catalyst and its catalytic application
  • A kind of preparation method of single-atom dispersed palladium-based catalyst and its catalytic application
  • A kind of preparation method of single-atom dispersed palladium-based catalyst and its catalytic application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, ZnCr-LDH was prepared by the double-drop method. The molar ratio of Zn / Cr is 2 / 1; first weigh 0.66mol of Zn(NO 3 ) 2 ·6H 2 O, 0.33mol Cr(NO 3 ) 3 9H 2 0, and measure 60ml of deionized water with a graduated cylinder to fully mix with the said metal salt, and put it into an ultrasonic cleaner and let it stand for 10min to achieve sufficient dissolution. In addition, weigh 0.30mol of NaOH and 0.25mol of NaOH 2 CO 3 Put it into a clean beaker, stir it with 80ml of deionized water to dissolve it, and put it into an ultrasonic cleaner for 10 minutes to make it fully dissolved; first add 150ml of deionized water to the three-necked flask; then put the sonicated alkali The solution and the salt solution were respectively added to two constant pressure dropping funnels, and added dropwise to the 150ml carbon dioxide-free aqueous solution in the three-necked flask, and the pH of the mixed solution was controlled to be stable at 10, and then the resulting ...

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

A preparation method for a single-atom dispersed palladium-based catalyst and a catalytic application thereof. In the preparation method for a single-atom dispersed palladium-based catalyst, a photodeposition method is used, and zinc-containing hydrotalcite is used as a carrier to prepare the single-atom dispersed palladium-based catalyst. That is, an alcohol solution and an H2PdCl4 solution are added to an aqueous solution in which a hydrotalcite carrier is dissolved; electrons are transferred from a valence band to a conduction band in a hydrotalcite semiconductor under irradiation of ultraviolet light; the electrons obtained from the conduction band reduce palladium ions to palladium atoms; and alcohol molecules in the solution undergoes an oxidation reaction to generate hydroxyl radicals in holes. Study on a photodeposition process shows that a single-atom palladium catalyst can be prepared by controlling the amount of the H2PdCl4 solution added and illumination time. By means of reduction treatment on a catalyst sample at different temperatures, single-atom palladiums do not aggregate at this moment; and the single-atom dispersed palladium-based catalyst has excellent catalytic activity and selectivity for a phenylacetylene hydrogenation reaction.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a single-atom dispersed palladium-based catalyst with hydrotalcite semiconductor as a carrier prepared by a photodeposition method and its application in catalytic alkyne selective hydrogenation reaction. Background technique [0002] Polystyrene is usually prepared industrially using styrene polymerization. However, the styrene raw material contains a small amount of phenylacetylene, which easily poisons the catalyst. In order to improve the purity of styrene monomer, phenylacetylene in raw materials is generally converted into styrene through selective hydrogenation reaction of phenylacetylene. Currently, supported palladium-based catalysts are widely used in this reaction due to their high catalytic hydrogenation activity, but when the conversion of phenylacetylene is higher than 95%, the selectivity of styrene will be greatly reduced. At present, the active sit...

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): B01J23/652C07C5/11C07C15/46
CPCB01J23/6522C07C5/11C07C2523/652C07C15/46
Inventor 张法智郝琳王红璐
Owner BEIJING UNIV OF CHEM TECH
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