Platinum catalyst based on metal-carrier strong interaction and preparation and application thereof

A platinum catalyst and catalyst technology, applied in the preparation of amino compounds, metal/metal oxide/metal hydroxide catalysts, organic compounds, etc., can solve the problems of poor selectivity, achieve selectivity improvement, and the preparation method is simple and easy effect of improving activity and selectivity

Active Publication Date: 2021-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Platinum group metal catalysts usually have high activity but poor selectivity, and are usually modified to improve selectivity by introducing a second metal or poison

Method used

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  • Platinum catalyst based on metal-carrier strong interaction and preparation and application thereof
  • Platinum catalyst based on metal-carrier strong interaction and preparation and application thereof
  • Platinum catalyst based on metal-carrier strong interaction and preparation and application thereof

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preparation example Construction

[0026] The preparation (0.5wt%) of embodiment 1-4 platinum catalyst:

[0027] TiO used 2 Weigh 0.0350g of the nanosheet carrier, disperse it in 20ml of ultrapure water, after ultrasonication for 15min, stir and add 1mg Pt / mL platinum precursor solution (chloroplatinic acid) 0.035mL, UV light for 20min, current 1A (electric power is 5 watts), after that, centrifuge, wash, and oven dry at 80°C for 10h. Then transferred to the muffle furnace air atmosphere roasting 350 ℃, 4h. A platinum catalyst with a loading of 0.5wt% is available, marked as 0.5wt%

[0028] Pt / TiO 2 -c350. After that, at 10vol% H 2 / He atmosphere, reduced at different temperatures for 1 hour, the obtained catalyst is the titanium dioxide-supported platinum catalyst with strong metal-support interaction, marked as 0.5wt% Pt / TiO 2 -HX, see Table 1 below for details.

[0029] Reduction temperature (℃) Mark as Example 1 250 0.5wt%Pt / TiO 2 -H250

Example 2 400 0.5wt%Pt / TiO 2 ...

Embodiment 5

[0032] The preparation (5wt%) of embodiment 5 platinum catalysts:

[0033] TiO used 2 Weigh 0.0200g of the nanosheet carrier, disperse it in 10ml of ultrapure water, and after ultrasonication for 20min, stir and add 1mg Pt / mL platinum precursor solution (platinum nitrate) 1mL, UV light for 40min, current 1A, after that, centrifuge, wash, and oven dry at 80°C for 14 hours. Then transfer to muffle furnace air atmosphere and bake at 400°C for 4 hours. A platinum catalyst is available with a loading of 5 wt%. After that, at 10vol% H 2 / He atmosphere, 500 ° C reduction for 1 hour, the obtained catalyst is a titanium dioxide-supported platinum catalyst with strong metal-support interaction, marked as 5wt% Pt / TiO 2 -H500.

[0034] image 3 5wt%Pt / TiO prepared according to the method of Example 5 2 -Schematic diagram of the CO-DRIFTS characterization results of the H500 catalyst. The characterization results show that the single atom of platinum has the ability to adsorb CO, an...

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Abstract

The invention relates to a preparation method of a supported platinum titanium dioxide catalyst based on strong interaction of metal and a carrier and an application of the supported platinum titaniumdioxide catalyst in selective hydrogenation reaction. The catalyst is prepared by taking titanium dioxide as a carrier and a platinum compound as a precursor through an ultraviolet light reduction method, and after hydrogen atmosphere reduction, platinum nanoparticles and the titanium dioxide carrier generate strong metal carrier interaction. The characterization results show that the catalyst contains platinum single atoms and platinum nanoparticles loaded on the surface of a carrier, after reduction, the platinum nanoparticles are embedded by the carrier, and the single atoms stably exist,so that the nanoparticles are prevented from further agglomeration to influence the reaction performance, and meanwhile, a Pt-Ti interface is increased. The catalyst is applied to a selective hydrogenation reaction, and the selectivity is greatly improved. The preparation method provided by the invention is simple and easy to implement, the exposed active sites can be regulated and controlled, theactivity and selectivity of the reaction are improved, and the preparation method has an excellent application prospect.

Description

technical field [0001] The invention relates to a preparation method of a platinum catalyst based on the strong interaction of metal supports and its application in selective hydrogenation reaction. Specifically, titanium dioxide is used as a carrier, and the active component is a platinum catalyst that generates a metal carrier after reduction. Strong interaction, the platinum single atom remains stable, and the platinum nanoparticles are wrapped by the carrier to prevent agglomeration, which can improve the selectivity of the hydrogenation reaction of the catalyst and obtain a high-temperature stable catalyst. Background technique [0002] Supported catalysts are widely used in the chemical industry and are very important in heterogeneous catalysis. Platinum group metal catalysts are widely used in large-scale industrial applications, including oxidation reactions, hydrogenation reactions, hydrocarbon rearrangement reactions, etc., exhibiting excellent catalytic activity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42C07C211/45C07C209/36C07C11/04C07C5/09
CPCB01J23/42B01J35/0066C07C209/36C07C5/09C07C211/45C07C11/04Y02P20/52
Inventor 乔波涛韩冰张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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