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Preparing method of limited-range catalyst modified through atomic layer deposition and application thereof

An atomic layer deposition and catalyst technology, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of aminohydroxy compounds, etc., can solve the problems of limited interface sites between metals and oxide carriers, and achieves limited interface sites. Solve the effect of poor stability and good stability

Active Publication Date: 2016-07-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention uses atomic layer deposition to synthesize a Pt-based catalyst confined in alumina nanotubes, and at the same time uses an ALD alumina thin layer to perform ultra-thin modification on it, and then maximizes the interface of the heterogeneous catalyst by regulating the thickness of the ultra-thin modification layer. To address the drawback of limited interface sites between metal and oxide supports in the prior art

Method used

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  • Preparing method of limited-range catalyst modified through atomic layer deposition and application thereof
  • Preparing method of limited-range catalyst modified through atomic layer deposition and application thereof
  • Preparing method of limited-range catalyst modified through atomic layer deposition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of ultrathin modified confined Pt-based catalyst

[0025] (1) Preparation of carbon nanofibers as templates. The prepared dry carbon nanofibers were dissolved in ethanol, and the concentration was controlled at 0.05g / ml, and then the liquid was evenly coated on the surface of the glass sheet, evaporated to dryness and placed in the atomic layer deposition vacuum reaction chamber. When depositing alumina, the temperature of the chamber is controlled at 150°C, and the chamber pressure is 50Pa; when depositing Pt, the temperature of the chamber is controlled at 280°C, and the chamber pressure is 50Pa. During the deposition process, the volume of the wall is reacted with carrier gas and vacuum. The ratio is 1 / 8min -1 Fill the chamber with carrier gas. Deposition of Al using water and trimethylaluminum as precursors 2 o 3 . Pt nanoparticles were deposited using (trimethyl)methylcyclopentadiene platinum and ozone as precursors.

[0026] (2) Using ...

Embodiment 2

[0028] Example 2: Preparation of Ultrathin Modified Confined Catalysts

[0029] (1) Preparation of carbon nanofibers as templates. The prepared dry carbon nanofibers were dissolved in ethanol, and the concentration was controlled at 0.03g / ml, and then the liquid was evenly coated on the surface of the glass sheet, evaporated to dryness and placed in the atomic layer deposition vacuum reaction chamber. When depositing alumina, the temperature of the chamber is controlled at 180°C, and the chamber pressure is 60Pa; when depositing Pt, the temperature of the chamber is controlled at 300°C, and the chamber pressure is 60Pa. During the deposition process, the volume of the wall is reacted with carrier gas and vacuum. The ratio is 1 / 8min -1 Fill the chamber with carrier gas. Deposition of Al using water and trimethylaluminum as precursors 2 o 3 . Pt nanoparticles were deposited using (trimethyl)methylcyclopentadiene platinum and ozone as precursors.

[0030] (2) Using the carb...

Embodiment 3

[0032] Example 3: Preparation of Ultrathin Modified Confined Pt-Based Catalysts

[0033] (1) Preparation of carbon nanofibers as templates. The prepared dry carbon nanofibers were dissolved in ethanol, and the concentration was controlled at 0.01g / ml, and then the liquid was evenly coated on the surface of the glass sheet, evaporated to dryness, and then placed in the atomic layer deposition vacuum reaction chamber. When depositing alumina, the temperature of the chamber is controlled at 100°C, and the chamber pressure is 10Pa; when depositing Pt, the temperature of the chamber is controlled at 250°C, and the chamber pressure is 10Pa. During the deposition process, the volume of the wall is reacted with carrier gas and vacuum. The ratio is 1 / 10min -1 Fill the chamber with carrier gas. Deposition of Al using water and trimethylaluminum as precursors 2 o 3 . Pt nanoparticles were deposited using (trimethyl)methylcyclopentadiene platinum and ozone as precursors.

[0034] (2...

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Abstract

The invention provides a preparing method of a limited-range catalyst modified through atomic layer deposition and application.The atomic layer deposition technology is utilized, an ultra-thin oxide layer, Pt nanometer particles and a thick oxide layer are deposited on a carbon nanometer fiber template successively, then calcination is carried out in air to remove the carbon nanometer fiber template, and a Pt-based catalyst with oxide ultra-thin modification and the limited range within an oxide nanometer tube is obtained.The prepared catalyst greatly overcomes the defect that the site of a traditional catalyst metal-oxide interface is limited; compared with a limited-range Pt catalyst without ultra-thin modification and a Pt catalyst with the unlimited range, the limited-range Pt catalyst with ultra-thin modification has the best reduction hydrogenation activity to tetranitro-phenol, and the method can be popularized in preparation of other multi-phase catalysts.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst, a method for ultra-thin modification of a confinement catalyst to improve catalytic activity, and the application of the catalyst in reduction hydrogenation of tetranitrophenol. Background technique [0002] Heterogeneous catalysts generally include a metal active component and an oxide support. The support not only simply improves the dispersion and thermal stability of the metal components, but also exerts an important influence on the performance of the catalyst through the interaction between the metal and the support. The metal-support interaction is often associated with the metal-support contact interface. Recent studies also show that the interface has superior catalytic reactivity and plays an important role in the catalytic process. (Zhang, B.; Chen, Y.; Li, J.W.; Pippel, E.; Yang, H.M.; Gao, Z.; Qin, Y. High efficiency Cu-ZnOhydrogenation catalyst: the tailoring o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42C07C215/76C07C213/02
CPCB01J23/42C07C213/02C07C215/76
Inventor 覃勇王眉花高哲杨慧敏张斌
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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