Pt-Fe nano catalyst and preparation method and application thereof

A nano-catalyst, pt-fe technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of reducing the utilization rate of active metals, increasing material consumption, etc., and achieve high selectivity and high selectivity The effect of stable performance and catalytic performance

Active Publication Date: 2019-06-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduced ligands inevitably occupy or passivate active sites, reducing the utilization of active metals and increasing material consumption, especially these selective hydrogenation catalysts are mainly noble metals such as Pt, Pd, Rh, etc.

Method used

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  • Pt-Fe nano catalyst and preparation method and application thereof
  • Pt-Fe nano catalyst and preparation method and application thereof
  • Pt-Fe nano catalyst and preparation method and application thereof

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preparation example Construction

[0026] The invention provides a kind of preparation method of Pt-Fe nano catalyst, comprising:

[0027] A) prepare Pt-Fe nanowire; The preparation method of described Pt-Fe nanowire comprises:

[0028] Mix and heat platinum acetylacetonate, cetyltrimethylammonium chloride, dibenzyl ether and oleylamine, then mix and heat with dibenzyl ether solution of triiron dodecacarbonyl, cool, separate, wash and dry to obtain Pt- Fe nanowires;

[0029] B) Pt-Fe nanowires, solvent and activated carbon are mixed, stirred, centrifuged and washed to obtain a Pt-Fe nano catalyst loaded on the activated carbon.

[0030] The present invention first prepares Pt-Fe nanowires.

[0031] According to the present invention, the preparation method of the Pt-Fe nanowires comprises:

[0032] Platinum acetylacetonate, cetyltrimethylammonium chloride, dibenzyl ether and oleylamine are first mixed to obtain a homogeneous mixture.

[0033] Wherein, the weight-to-volume ratio of platinum acetylacetonate, ...

Embodiment 1

[0060] A Pt-Fe nano-catalyst, the catalyst includes Pt-Fe nano-wires with abundant high-index facets, loaded on activated carbon.

[0061] The preparation method of above-mentioned Pt-Fe nanometer catalyst comprises:

[0062] The obtained sample was purified by heating the Pt-Fe nanowires at 120° C. in air for 3 hours and keeping at 80° C. under vacuum for 3 hours. In a typical synthesis of Pt-Fe nanocrystals / C, the sample (20 mg) was dispersed in 10 mL of n-butanol in a 20 mL vial, followed by the addition of activated carbon (80 mg). The colloidal mixture was vigorously stirred for 4 hours, centrifuged at 11,000 rpm for 15 minutes to obtain a solid product, and then washed once with n-butanol.

[0063] The above-mentioned Pt-Fe nanowires are obtained by the following preparation method:

[0064] Will contain 11.8mg Pt(acac) 2 , a mixture of 288 mg CTAC, 1.5 mL BE and 2.5 mL OAm was charged into a 20 mL vial at room temperature. Transfer the solution to a 180 °C oil bath ...

Embodiment 2

[0069] A Pt-Fe nano-catalyst, the catalyst includes Pt-Fe nano-wires with abundant high-index faces, loaded on activated carbon.

[0070] The preparation method of above-mentioned Pt-Fe nanometer catalyst comprises:

[0071] The obtained sample was purified by heating the Pt-Fe nanowires at 120° C. in air for 3 hours and keeping at 80° C. under vacuum for 3 hours. In a typical synthesis of Pt-Fe nanocrystals / C, the sample (20 mg) was dispersed in 10 mL of n-butanol in a 20 mL vial, followed by the addition of activated carbon (80 mg). The colloidal mixture was vigorously stirred for 4 hours, centrifuged at 11,000 rpm for 15 minutes to obtain a solid product, and then washed once with n-butanol.

[0072] The above-mentioned Pt-Fe nanowires are obtained by the following preparation method:

[0073] Will contain 11.8mg Pt(acac) 2 , a mixture of 288 mg CTAC, 1.5 mL BE and 2.5 mL OAm was charged into a 20 mL vial at room temperature. Transfer the solution to a 180 °C oil bath f...

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Abstract

The invention provides a preparation method of a Pt-Fe nano catalyst, which comprises the following steps of: preparing a Pt-Fe nanowire;, specifically, the preparation method of the PPt-Fe nanowire comprises the steps of mixing and heating platinum acetylacetonate, cetyl trimethyl ammonium chloride, dibenzyl ether and oleamine, then mixing and heating the mixture with a dibenzyl ether solution ofdodecylcarbonyl triiron and performing cooling, separating, washing and drying to obtain the Pt-Fe nanowire; and mixing the Pt-Fe nanowire, a solvent and active carbon, and then performing stirring,centrifuging and washing to obtain the Pt-Fe nano catalyst loaded on the active carbon. According to the method, the Pt-Fe nanowire with rich high-index surfaces are obtained through the control of reaction conditions, the size and the length of the Pt-Fe nanowire are uniform; in the selective hydrogenation of acetophenone, only carbon-oxygen double bonds of the acetophenone can be selectively hydrogenated, so that benzene ring hydrogenation or over hydrogenation deoxygenation is avoided, a single phenylethanol product is obtained, and the selectivity of obtaining phenylethanol through extremely high hydrogenation is achieved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a Pt-Fe nanometer catalyst, its preparation method and application. Background technique [0002] The selective hydrogenation of special unsaturated groups has been widely used in chemical production, pharmaceutical synthesis, pesticides and dyes. During selective hydrogenation, substrate molecules will contain various unsaturated groups, such as carbonyl (C=O), aromatic rings, nitro groups, and carbon-carbon double bonds (C=C). Since all unsaturated groups have the potential to be hydrogenated, it is difficult to improve the selectivity of specific products. [0003] An effective approach to enhance selectivity is based on the steric effect, which enables the selective adsorption of specific unsaturated groups on the catalyst surface. For example, thiol-treated Pd nanosheets exhibited high selectivity (>97%) for the semihydrogenation of C≡C groups to 1-phenyl-1-propyne. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02C07C29/145C07C33/22
Inventor 吴文龙韦淼今李润泽曾杰
Owner UNIV OF SCI & TECH OF CHINA
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