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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  • Claims
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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

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

Examples

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Example Embodiment

[0064] The present invention provides a method for preparing a composite material compounded with an atomic mixing grade alloy, which includes 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 compounded with two or more monoatomic metals obtained in the above steps is heat-treated and reduced to obtain a composite material compounded with an atomic mixed grade alloy.

[0067] In the present invention, the composition, structure and requirements of the composite material compounded with the atomic mixing grade alloy in the above preparation method, as well as the corresponding optimization principle, are the corresponding composition, structure and requirements of the composite material compounded with the ...

Example Embodiment

[0107] Example 1

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

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

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

[0111] See figure 1 , figure 1 This is a spherical aberration transmiss...

Example Embodiment

[0121] Example 2

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

[0123] Add 200mg CeO 2 Dissolve in 40mL of water, stir for half an hour, then add NH 4 HCO 3 Adjust the pH value, and then add 20mL platinum palladium aqueous solution, in which HPtCl 4 ·6H 2 O and PdCl 2 The content of the solution is 2mg and 4mg respectively. After centrifugation, the obtained solution is directly dried 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%) calcined at 800°C for 2h to obtain PtPd NAs. The loading of Pt obtained at this time is close to 0.2%, and the loading of Pd is close to 0.3%, and the mass ratio is 1:1.5.

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

[0125] The catalyst obt...

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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
CPCB01J23/63B01J35/0013B01J35/006B01J37/035B01J37/08B01J37/18C07C209/36C07C211/46
Inventor 宋术岩张洪杰周玄
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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