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Pd-Rh nanocatalyst, and preparation method and application thereof

A nano-catalyst and solvent technology, applied in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve problems such as low product selectivity, and achieve the double bond hydrogenation selection of m-nitrostyrene High performance, stable catalytic performance and good catalytic activity

Active Publication Date: 2019-09-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when there are more than one hydrogenation-reducible groups in the substrate, traditional noble metal catalysts will reduce these reducible groups simultaneously, resulting in lower product selectivity.

Method used

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  • Pd-Rh nanocatalyst, and preparation method and application thereof
  • Pd-Rh nanocatalyst, and preparation method and application thereof
  • Pd-Rh nanocatalyst, and preparation method and application thereof

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preparation example Construction

[0021] The invention provides a kind of preparation method of Pd-Rh nano catalyst, comprising:

[0022] Palladium source solution, rhodium source solution, aqueous solution of potassium iodide and polyvinylpyrrolidone are mixed and dissolved in a solvent to obtain a mixture, the mixture is heated, cooled, centrifuged, and cleaned to obtain a Pd-Rh nanocatalyst; the palladium source is sodium chloropalladate ; The rhodium source is sodium hexachlororhodate.

[0023] In the invention, the palladium source solution, rhodium source solution, potassium iodide aqueous solution and polyvinylpyrrolidone are mixed and dissolved in the solvent.

[0024] According to the present invention, the palladium source is preferably sodium chloropalladate; the rhodium source is preferably sodium hexachlororhodate. The present invention does not limit the source, and it can be commercially available.

[0025] Wherein, the concentration of the sodium chloropalladate solution is preferably 19.5mM~...

Embodiment 1

[0047] A Pd-Rh nanometer catalyst comprises Pd-Rh nanocrystals in which rhodium is doped in palladium crystals.

[0048] The preparation method of above-mentioned Pd-Rh nanometer catalyst comprises:

[0049] 1.7ml of 20mM sodium chloropalladate aqueous solution, 0.3ml of 20mM sodium hexachlororhodium aqueous solution, 1ml of 1M potassium iodide aqueous solution and 150mg of polyvinylpyrrolidone were mixed in 10ml of dimethylformamide, and the homogeneous mixture was placed in 140 Heating in an oven at ℃ for 4 hours, cooling, centrifuging at a speed of 10000 rpm, washing with water three times, and then washing with ethanol three times, then placing it in a UV-ozone cleaning machine at a distance of 5 mm from the lamp for 30 minutes, taking it out to obtain the Pd-Rh nanocatalyst.

[0050] Adopt the Pd-Rh nanometer catalyst that embodiment 1 makes to carry out the catalytic performance test of nitrostyrene selective hydrogenation reaction:

[0051] In the catalytic test, we a...

Embodiment 2

[0054] A Pd-Rh nanometer catalyst comprises Pd-Rh nanocrystals in which rhodium is doped in palladium crystals.

[0055] The preparation method of above-mentioned Pd-Rh nanometer catalyst comprises:

[0056] 1.7ml of 20mM sodium chloropalladate aqueous solution, 0.3ml of 20mM sodium hexachlororhodium aqueous solution, 1ml of 1M potassium iodide aqueous solution and 130mg of polyvinylpyrrolidone were mixed in 10ml of dimethylformamide, and the homogeneous mixture was placed in 140 Heating in an oven at ℃ for 4 hours, cooling, centrifuging at a speed of 10000 rpm, washing with water three times, and then washing with ethanol three times, then placing it in a UV-ozone cleaning machine at a distance of 5 mm from the lamp for 30 minutes, taking it out to obtain the Pd-Rh nanocatalyst.

[0057] Adopt the Pd-Rh nanometer catalyst that embodiment 2 makes to carry out the catalytic performance test of nitrostyrene selective hydrogenation reaction:

[0058] In the catalytic test, we a...

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Abstract

The invention provides a preparation method of a Pd-Rh nanocatalyst. The preparation method comprises the following steps: a palladium source solution, a rhodium source solution, an aqueous solution of potassium iodide and polyvinylpyrrolidone are mixed and dissolved in a solvent to obtain a mixture, and the mixture is heated, cooled, centrifuged and washed to obtain the Pd-Rh nanocatalyst, wherein the palladium source is disodium tetrachloropalladate, and the rhodium source is sodium hexachlororhodate (III). An element doping process is adopted to dope a palladium nanocrystal with a rhodium atom in order to construct the nanocatalyst, and a unique 3-nitrostyrene adsorption structure different from the Pd nanocrystal is obtained through the doping of the nanocatalyst with the rhodium atom,so hydrogenation of a nitro group is difficult, thereby the selectivity to carbon-carbon double bonds is improved. The Pd-Rh nanocatalyst of the invention has the advantages of good catalytic activity, high selectivity of double bond hydrogenation of 3-nitrostyrene, and stable catalytic performance.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a Pd-Rh nanometer catalyst, its preparation method and application. Background technique [0002] For catalytic reactions, it is often necessary to sacrifice catalyst activity in exchange for high selectivity to specific products. Therefore, it is of great value to develop heterogeneous catalysts with both high activity and high selectivity. In particular, for selective hydrogenation reactions, the selective hydrogenation of carbon-carbon double bonds is very important for the synthesis of pharmaceuticals, perfumes, polymers, pesticides and other products. However, when there are more than one hydrogenation-reducible groups in the substrate, traditional noble metal catalysts will reduce these reducible groups simultaneously, resulting in lower product selectivity. [0003] Traditional solutions include the introduction of ligands, zeolites, metal-organic frameworks, poisoning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C07C201/12C07C205/06
CPCB01J23/464C07C201/12C07C205/06
Inventor 吴文龙盛云祥朱怡峰曾杰
Owner UNIV OF SCI & TECH OF CHINA
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