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Iron-doped magnesium aluminate spinel loaded noble metal catalyst as well as preparation and application thereof

A precious metal catalyst, magnesium aluminum spinel technology, applied in the field of catalysis, can solve the problems of no controllable synthesis path, complicated process, expensive preparation cost, etc., achieve good catalyst structure control ability, improve reaction activity, and reliable operation. Effect

Active Publication Date: 2022-02-01
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

Among them, noble metal diatomic catalysts prepared by mass spectrometry have very low yields and expensive preparation costs, and are not suitable for small-scale experimental research and large-scale production applications.
However, the process of preparing catalysts by wet chemical methods is complicated, the parameters are not easy to control, and it is limited to the preparation of non-noble metal catalysts with two atoms. There is no controllable synthetic route for the preparation of catalysts containing more than two atomic clusters.

Method used

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  • Iron-doped magnesium aluminate spinel loaded noble metal catalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, 4 mg of chloroplatinic acid was added to 90 ml of ultrapure water, and then 1.5 g of MgAl 1.2 Fe 0.8 o 4 Added to the solution, stirred at room temperature for 12h. The mixture was filtered, dried in an oven at 80 °C overnight, and then calcined in a muffle furnace at 800 °C for 5 h to obtain single-atom supported Pt 1 / MgAl 1.2 Fe 0.8 o 4 . Test the content of Pt in the sample by an inductively coupled plasma optical emission spectrometer (ICP-OES), and the loading of Pt is 0.1%; test the CO adsorption of the sample by a Fourier transform infrared diffuse reflectance spectrometer, it can be seen that the sample is at room temperature There is no bridge adsorption peak of CO; in the spherical aberration electron microscope, Pt is dispersed on the support in the form of single atoms. 100~250 mesh Pt 1 / MgAl 1.2 Fe 0.8 o 4 Scatter and sprinkle on the sample stage equipped with sand cores, and then put the sample stage into the deposition chamber of the A...

Embodiment 2

[0017] First, 8 mg of ruthenium acetylacetonate was added to 90 ml of ultrapure water, and then 1.5 g of MgAl 1.2 Fe 0.8 o 4 Added to the solution, stirred at room temperature for 12h. The mixture was filtered, dried overnight in an oven at 80 °C, and then calcined in a muffle furnace at 800 °C for 5 h to obtain single-atom-loaded Ru 1 / MgAl 1.2 Fe 0.8 o 4 . The content of Ru in the sample was tested by ICP-OES, and the loading of Ru was 0.12%. In the spherical aberration electron microscope, Ru was dispersed on the support in the form of single atoms. 100-250 mesh Ru 1 / MgAl 1.2 Fe 0.8 o 4 Scatter and sprinkle on the sample stage equipped with sand cores, and then put the sample stage into the deposition chamber of the ALD instrument. After the whole system is sealed, turn on the dry pump to pump the pressure of the cavity to 5hPa, and heat the cavity, and set the temperature to 200°C. The temperature of the source vial containing the ruthenocene source was set to...

Embodiment 3

[0019] First, 4 mg of chloroplatinic acid was added to 90 ml of ultrapure water, and then 1.5 g of MgAl 1.2 Fe 0.8 o 4 Added to the solution, stirred at room temperature for 12h. The mixture was filtered, dried in an oven at 80 °C overnight, and then calcined in a muffle furnace at 800 °C for 5 h to obtain single-atom supported Pt 1 / MgAl 1.2 Fe 0.8 o 4 . The content of Pt in the sample was tested by ICP-OES, and the loading of Pt was 0.1%. In the spherical aberration electron microscope, Pt was dispersed on the support in the form of single atoms. 100~250 mesh Pt 1 / MgAl 1.2 Fe 0.8 o 4Scatter and sprinkle on the sample stage equipped with sand cores, and then put the sample stage into the deposition chamber of the ALD instrument. After the whole system is sealed, turn on the dry pump to pump the pressure of the cavity to 5hPa, and heat the cavity, and set the temperature to 200°C. The temperature of the source bottle containing the bis(tetramethylheptanedione) pal...

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Abstract

The invention discloses a preparation method of an iron-doped magnesium aluminate spinel loaded noble metal catalyst. By using an iron-doped magnesium aluminate spinel supported noble metal monatomic catalyst as a substrate, a noble metal source can be selectively deposited on the iron-doped magnesium aluminate spinel supported noble metal monatomic by atomic layer deposition (ALD) technique. By changing the number of deposition cycles, the iron-doped magnesium aluminate spinel loaded noble metal diatom and polyatom catalyst with a specific atom number can be obtained, so as to meet the requirements of different catalytic systems. Compared with the prior art, the preparation method has the advantages that controllable growth of iron-doped magnesium aluminate spinel supported noble metal diatoms and polyatoms can be realized, and the prepared catalyst is relatively good in performance, reliable to operate, simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a preparation method of an iron-doped magnesia-aluminum spinel-loaded noble metal diatomic and polyatomic catalyst, which has high catalytic oxidation and selective hydrogenation activity. [0002] technical background [0003] (1) Single-atom catalysts have received extensive attention in the field of catalysis since they were reported in 2011. Compared with nanoparticle catalysts, single-atom catalysts maximize the degree of atomic dispersion and exhibit ultrahigh activity and chemoselectivity in many reactions. At the same time, if a single atom is used as an isolated active site, the synergy between atoms is greatly weakened, and the activity in some combustion and organic synthesis reactions is low. The synthesis of atomically dispersed diatomic and polyatomic catalysts not only achieves the highest atom utilization, but also possesses catalytic activity and selectivity supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C01B32/50C07C15/46C07C5/09
CPCB01J23/8946C01B32/50C07C5/09C07C15/46
Inventor 乔波涛杨静怡张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI