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Preparation method and catalytic application of monatomic dispersion palladium-based catalyst

An atomic dispersion and catalyst technology, which is applied in the application field of single atom dispersed palladium-based catalyst and its catalytic alkyne selective hydrogenation reaction, can solve the problems of low selectivity and low activity, and achieves improved selectivity and activity, high catalytic performance Activity and selectivity, effects of excellent catalytic activity and selectivity

Active Publication Date: 2017-08-04
BEIJING UNIV OF CHEM TECH
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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

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  • Preparation method and catalytic application of monatomic dispersion palladium-based catalyst
  • Preparation method and catalytic application of monatomic dispersion palladium-based catalyst
  • Preparation method and catalytic application of monatomic dispersion palladium-based catalyst

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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 ...

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Abstract

The invention discloses a preparation method and catalytic application of a monatomic dispersion palladium-based catalyst. The preparation method of the monatomic dispersion palladium-based catalyst is a photo-deposition method, and uses zinc-containing hydrotalcite as a carrier to prepare the monomeric dispersion palladium-based catalyst. Namely, an alcohol solution and an H2PdCl4 solution are added to a hydrotalcite carrier-dissolved aqueous solution; electrons are transferred from a valence band to a conduction band in a hydrotalcite semiconductor under irradiation of ultraviolet light; alcohol molecules in the solution are subjected to oxidation reaction to generate hydroxyl radicals in holes. Study on photo-deposition process shows that a monatomic palladium catalyst can be prepared by controlling the amount of added H2PdCl4 solution and illumination time. The preparation method provided by the invention performs reduction treatment on catalyst samples at different temperatures, monatomic palladium is not aggregated at the moment; the monatomic dispersion palladium-based catalyst has excellent catalytic activity and selectivity for hydrogenation reaction of phenylacetylene.

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

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Application Information

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Patent Type & Authority Applications(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
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