Graphene@noble metal nanocluster@titanium dioxide three-layer structure catalyst, preparation method and application thereof

A technology of titanium dioxide and three-layer structure, which is applied in the field of direct synthesis of hydrogen peroxide from hydrogen and oxygen, and achieves the effects of low energy consumption, easy operation and simple process flow

Inactive Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in the preparation of hydrogen peroxide by anthraquinone method: 1. This production method can only be applied to large-scale production, and safety measures need to be taken during transportation and storage
2. The production process releases organic gases, discharges wastewater and solid waste, so an efficient and clean production method is needed to replace

Method used

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  • Graphene@noble metal nanocluster@titanium dioxide three-layer structure catalyst, preparation method and application thereof
  • Graphene@noble metal nanocluster@titanium dioxide three-layer structure catalyst, preparation method and application thereof
  • Graphene@noble metal nanocluster@titanium dioxide three-layer structure catalyst, preparation method and application thereof

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Embodiment 1

[0052] This embodiment is the preparation of flaky titanium dioxide, and the specific process is as follows:

[0053] First, 10 mmol of isoamyl titanate (TTIP) and 20 mmol of hydrochloric acid (HCl) were mixed together to form A solution. 1g of PEO20-PPO70-PEO20 (P123) and 9mL of ethanol were mixed to form B solution. Slowly add solution B to solution A and stir for 30 minutes, then pour it into ethylene glycol to form a mixed solution, transfer it to a reaction kettle, react at 140°C for 12 hours, then wash the product with ethanol, and dry it under vacuum at 80°C for 24 Hours, nano-flaky titanium dioxide was obtained.

[0054] The nanosheets obtained in this embodiment are 500nm-5μm size flake materials, figure 1 From the TEM image of the material, it can be seen that the size of the prepared nano flakes is at least 1 μm.

Embodiment 2

[0056] Present embodiment is the preparation of (oxidized) graphene, and concrete process is as follows:

[0057] 1g of graphite and 2g of sodium nitrate (NaNO 3 ) were mixed in a 500mL beaker and stirred in an ice-water bath, and then 100mL of concentrated sulfuric acid was slowly added into it with vigorous stirring to avoid a sudden increase in temperature. After stirring for 1 hour, weigh 14.0g potassium permanganate (KMnO 4 ) into several portions, gradually add within half an hour to prevent the temperature from exceeding 20°C, control the temperature in time, stir for another hour, let the temperature rise to 40°C and react for 2 hours. Then add 100mL of water and raise the temperature to 90°C for half an hour. Finally, add a mixture of hydrogen peroxide and water to reduce unreacted high-valent manganese to divalent manganese ions, then wash repeatedly with a large amount of water, and dry in a vacuum to obtain two-dimensional (oxide) graphene.

[0058] figure 2 I...

Embodiment 3

[0060] This embodiment is the preparation of (oxidized) graphene@noble metal nanoparticles@flaky titanium dioxide sandwich structure catalyst, the specific process is as follows:

[0061] The two-dimensional (oxidized) graphene prepared by embodiment 2 is dispersed in deionized water, stirred with magnetic force for 2 hours and ultrasonic until forming a uniform brown-black solution, and the weighed 50mg palladium chloride and 50mg chloroauric acid are dissolved in Stir in the graphene solution for 30 minutes, then add the newly prepared sodium borohydride solution, load the gold-palladium alloy particles on the surface of the graphene, and then add the pre-dispersed flaky titanium dioxide to it, and finally obtain the two-dimensional sandwich Structural Catalyst.

[0062] Figure 4 Shown is the XRD pattern of (oxidized) graphene@AuPd nanoparticles@flaky titania. Figure 5 The TEM image of the two-dimensional layered catalyst is shown. It can be seen that the gold-palladium ...

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Abstract

The invention discloses a (oxidized) graphene@noble metal nanoparticle@flaky titanium dioxide sandwich structure catalyst and a preparation method thereof, and application in direct synthesis of hydrogen peroxide from hydrogen and oxygen, and belongs to the technical field of inorganic catalyst preparation and hydrogen peroxide synthesis. According to the invention, the (oxidized) graphene@-noblemetal nanoparticle@flaky titanium dioxide sandwich structure catalyst is successfully designed and prepared under mild reaction conditions by using a dissolution thermal synthesis technology and a noble metal deposition and precipitation principle, and the green chemical hydrogen peroxide is directly prepared from hydrogen and oxygen by using the unique catalytic characteristics of the two-dimensional catalyst, wherein the two-dimensional catalyst has the characteristics of uniform and high-dispersion characteristics of noble metal nanoparticles, good protection effect on active sites and simple and convenient preparation, and particularly the two-dimensional catalyst material has significant improvement on the technology of directly synthesizing hydrogen peroxide from hydrogen and oxygen.

Description

technical field [0001] The invention belongs to the technical field of inorganic catalyst preparation and hydrogen peroxide synthesis, and specifically relates to a (oxidized) graphene@noble metal nanoparticle@flaky titanium dioxide sandwich structure catalyst and its preparation method and the application of direct synthesis of hydrogen peroxide with hydrogen and oxygen. Background technique [0002] In recent years, with the development and application of nano-catalysts, in order to further improve the performance of catalysts, it has developed from a single composition to a multi-component unit composite structure, making up for the defects of a single material to complete the synergistic catalytic effect, and the support carrier is also developing composite materials . With the development of two-dimensional materials, two-dimensional structure-supported nanocatalysts have also been developed and utilized. This is because the two-dimensional structure has attracted peop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/52B01J37/03B01J37/10C01B15/029
CPCB01J23/42B01J23/44B01J23/52B01J35/008B01J37/031B01J37/10C01B15/029
Inventor 李杲郭嵩张佳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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