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Composite material compounded with atomic mixed grade alloy for catalyzing nitrobenzene hydrogenation as well as preparation method and application of composite material

A composite material and atomic-level technology, which is applied in the preparation of amino compounds, organic compounds, catalyst activation/preparation, etc., can solve problems such as uneven mixing and affecting the activity of nano-alloys, so as to improve catalytic performance, enhance synergy, The effect of simple and easy carrier

Inactive Publication Date: 2020-09-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of nano-alloys is often related to the degree of mixing of nanoparticles. However, the existing nano-alloys are unevenly mixed to varying degrees. It is difficult to ensure the uniform distribution of metal elements in the alloy, which affects the activity of nano-alloys.

Method used

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  • Composite material compounded with atomic mixed grade alloy for catalyzing nitrobenzene hydrogenation as well as preparation method and application of composite material
  • Composite material compounded with atomic mixed grade alloy for catalyzing nitrobenzene hydrogenation as well as preparation method and application of composite material

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preparation example Construction

[0064] The invention provides a method for preparing a composite material compounded with an atomically mixed grade alloy, comprising the following steps:

[0065] A) After mixing cerium oxide with oxygen vacancies, a dispersant, two or more monoatomic metal source aqueous solutions and water, a composite material compounded with two or more monoatomic metals is obtained;

[0066] B) Under the condition of hydrogen or hydrogen gas mixture, the composite material composited with two or more single-atom metals obtained in the above steps is subjected to heat treatment and reduced to obtain a composite material composited with an atomic-mixed alloy.

[0067] In the present invention, the composition, structure and requirements of the composite material compounded with atomically mixed grade alloys in the above preparation method, as well as the corresponding optimization principles, and the composition, structure and requirements corresponding to the aforementioned composite mater...

Embodiment 1

[0108] Pt 1 PD 1 Synthesis and catalytic characterization of NAs

[0109] 200mg CeO 2 Dissolve in 40mL of water, stir for half an hour, then add NH 4 HCO 3 Adjust the pH value, then add 20mL platinum palladium aqueous solution, wherein HPtCl 4 ·6H 2 O and PdCl 2 The content of each is 2 mg, and then the obtained solution is centrifuged and directly dried in the air at 70°C, washed with water and centrifuged several times after drying, and then dried in an oven at 70°C for 12 hours to obtain Pt 1 / Pd 1 SAs, followed by a mixture of hydrogen and argon (H 2 10%, Ar 90%) at 800°C for 2 hours to obtain Pt 1 PD 1 NAs. At this time, the loadings of Pt and Pd obtained are close to 0.2%, and the mass ratio is 1:1.

[0110] The composite material compounded with platinum-palladium nano-alloy of atomic mixing level prepared in Example 1 of the present invention was characterized.

[0111] see figure 1 , figure 1 Spherical aberration transmission electron micrograph of ...

Embodiment 2

[0122] Pt 1 PD 1.5 Synthesis and catalytic characterization of NAs

[0123] 200mg CeO 2 Dissolve in 40mL of water, stir for half an hour, then add NH 4 HCO 3 Adjust the pH value, then add 20mL platinum palladium aqueous solution, wherein HPtCl 4 ·6H 2 O and PdCl 2 The contents are 2mg and 4mg, respectively, and then the obtained solution is centrifuged and dried directly in the air at 70°C. After drying, it is washed and centrifuged several times, and then dried in an oven at 70°C for 12 hours to obtain Pt / Pd SAs, followed by a mixture of hydrogen and argon (H 2 10%, Ar 90%) were calcined at 800℃ for 2h to obtain PtPd NAs. At this time, the loading of Pt is close to 0.2%, and the loading of Pd is close to 0.3%, and the mass ratio is 1:1.5.

[0124] Performance testing was performed on the composite material compounded with the platinum-palladium alloy of atomic mixing grade prepared in Example 2 of the present invention.

[0125] The catalyst obtained in Example 2 ...

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Abstract

The invention provides a composite material compounded with an atomic mixed-grade alloy. The composite material is obtained by carrying out heat treatment on a composite material compounded with morethan two monoatomic metals, the composite material compounded with more than two monatomic metals comprises a cerium oxide carrier with oxygen vacancy and more than two monatomic metals compounded onthe surface of the cerium oxide carrier. According to the atomic mixing grade alloy composite material provided by the invention, a monatomic material is used as an intermediate product, the synthesized nano-alloy has the maximum mixing degree, the synergistic effect between metals in the alloy is greatly improved, the catalytic performance is improved, and the synthesis method is green, environmentally friendly, simple and safe in step and short in preparation period; the carrier is simple and easy to obtain and has a very high application prospect. Moreover, all components of the atom mixed-level alloy / cerium dioxide carrier prepared by the method have the maximum synergistic effect, and the atom mixed-level alloy / cerium dioxide carrier shows very high catalytic performance in a nitrobenzene hydrogenation process and hardly generates by-products.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation catalysts, and relates to a composite material compounded with an atomically mixed grade alloy and its preparation method and application, in particular to a composite material composited with an atomically mixed grade alloy for catalyzing the hydrogenation of nitrobenzene Its preparation method and application. Background technique [0002] The hydrogenation of nitrobenzene to aniline is an industrially important reaction. Aniline is an important organic chemical raw material, widely used in organic dyes, coatings, synthetic rubber and pesticides and other fields. Especially as a raw material for the production of isocyanate, various types of chemical products can be produced, and the application prospect is very broad. At present, nitrobenzene iron powder reduction method, phenol ammonia solution method, and nitrobenzene catalytic hydrogenation reduction method are usually used to produc...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/03B01J37/18B01J37/08C07C209/36C07C211/46
CPCB01J23/63B01J37/035B01J37/18B01J37/08C07C209/36B01J35/393B01J35/23C07C211/46
Inventor 宋术岩张洪杰周玄
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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