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Palladium carbon catalyst as well as preparation method and application thereof

A palladium-carbon catalyst and a catalyst technology are applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of organic compounds, etc., to achieve the effects of good stability, easy particle size, and omitting operation techniques

Active Publication Date: 2014-04-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the direct selective hydrogenation of phenol to cyclohexanone under mild conditions remains a challenge.

Method used

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  • Palladium carbon catalyst as well as preparation method and application thereof
  • Palladium carbon catalyst as well as preparation method and application thereof
  • Palladium carbon catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1) Activated carbon pretreatment: put the coconut shell activated carbon that has been washed and boiled 2 to 3 times in a nitric acid solution with a mass fraction of 10.94%, heat and reflux in a water bath at ~60°C for 4 hours, filter with deionized water, and wash to pH It is neutral, and dried at 110°C for 12 hours to obtain oxidized modified activated carbon;

[0066] 2) TiO loaded by sol-gel method 2 : Configure solution A and solution B, under the condition of magnetic stirring, slowly add B to solution A drop by drop to form mixed solution C sol, disperse 12.03g of modified activated carbon obtained in step 1) into solution C, add concentrated HNO 3(66-68% by mass) to adjust the pH to 3, stir for 5-10 minutes, and then ultrasonically oscillate for 10 minutes to make the sol enter the AC channel, stop stirring and let stand to form a gel, dry at 80°C for 12h, and calcinate at 500°C for 2h to obtain TiO 2 Composite carrier material TiO with a loading of 9.95% 2...

Embodiment 2

[0070] TiO by sol-gel method 2 Loaded on the modified activated carbon to obtain the composite carrier TiO 2 / AC. Then use the method of photocatalytic reduction to load metal palladium onto the composite carrier TiO 2 / AC, after subsequent filtration, washing, and drying processes, PdTiO 2 / AC.

[0071] The specific implementation process is the same as in Example 1, except that HNO 3 The concentration is 11.13%, the composite carrier TiO 2 TiO in / AC 2 The mass content is 9.89%, the catalyst PdTiO 2 The mass content of palladium in / AC is 0.5%.

[0072] The XRD figure of the catalyst that present embodiment obtains is as follows figure 2 said, by figure 2 It can be seen that the single crystal peak of Pa is very obvious, and it can be seen that the catalyst is loaded with single crystal Pa crystal particles.

Embodiment 3

[0074] With embodiment 1, different is that composite carrier TiO 2 TiO in / AC 2 The mass content is 15%, the catalyst PdTiO 2 The Pd content in / AC was 0.5% by mass.

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Abstract

The invention relates to a palladium carbon catalyst which comprises the following components: (1) nanometer TiO2-modified active carbons are used as composite carriers; (2) Pd nanometer particles are used as active components, wherein the strong interaction between metals and the carriers exists in the active components and TiO2 on the composite carriers to form a Pd@TiO2 structure so as to form structural Pd@TiO2 / active carbons of the catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a palladium-carbon catalyst and its preparation method and application, in particular to the application of the catalyst in the selective hydrogenation of phenol to prepare cyclohexanone. Background technique [0002] The supported nano-noble metal catalyst has good hydrogenation performance, and is used in the catalytic hydrogenation of various unsaturated organic compounds in petrochemical, pharmaceutical, dye, pesticide and other industries. As a hydrogenation catalyst with excellent performance, nano-palladium catalyst is often used in the selective hydrogenation of alkenes, nitro groups, nitroso groups, ketones, aldehydes, etc., and occupies an extremely important position in the chemical industry. It is generally believed that a supported nano-palladium catalyst with excellent performance should have the following characteristics in structure: 1) The palladium microcrystalline part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C07C45/00C07C49/403
Inventor 周继承欧阳文兵欧颖缥
Owner XIANGTAN UNIV
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