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Preparation method of metal oxide loaded monatomic catalyst

A metal compound and catalyst technology, applied in the field of materials science and engineering, can solve the problems of high cost, low preparation amount, large carrier loss, etc., and achieve the effects of reducing cost and difficulty, wide application, and preventing agglomeration

Active Publication Date: 2019-11-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on the characteristics and deficiencies of many current metal single-atom preparation methods, the purpose of the present invention is to provide a method for preparing metal oxide-supported single-atom catalysts to solve the problems of high cost, complicated preparation conditions, large carrier loss, and Problems such as low metal content and low preparation volume

Method used

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  • Preparation method of metal oxide loaded monatomic catalyst
  • Preparation method of metal oxide loaded monatomic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Mix 0.004 g of tetraammine platinum nitrate and 1 g of iron oxide into a commercial 50 ml agate ball mill jar with a cover, and add 10 3 mm agate beads and 80 6 mm agate beads to it. Put the ball mill jar into the planetary ball mill QM3SP4L, set the ball milling conditions to rotate clockwise and counterclockwise alternately every 1.5 h, the two-way stop waiting time is 0, the frequency is 30 HZ, and the ball milling is 24 hours. Stopped for two or three times in the middle, took out the ball mill tank and stirred it with a plastic spoon, loosened the compacted oxide carrier, and continued to run. The ball-milled solid was put into a porcelain boat, and calcined in a muffle furnace or tube furnace at 400 °C in air for 2 h to obtain the corresponding single-atom catalyst material. Spherically aberration corrected TEM such as figure 1 Pt / Fe 2 o 3 shown.

Embodiment 2

[0034] Mix 0.0017 g of platinum oxide and 1 g of manganese oxide into a commercial 50 ml agate ball mill jar with a lid, and add 10 3 mm agate beads and 80 6 mm agate beads to it. Put the ball mill jar into the planetary ball mill QM3SP4L, set the ball milling conditions to rotate clockwise and counterclockwise alternately every 1.5 h, the two-way stop waiting time is 0, the frequency is 30 HZ, and the ball milling is 24 hours. Stopped for two or three times in the middle, took out the ball mill tank and stirred it with a plastic spoon, loosened the compacted oxide carrier, and continued to run. The ball-milled solid was put into a porcelain boat, and calcined in a muffle furnace or tube furnace at 400 °C in air for 2 h to obtain the corresponding single-atom catalyst material.

Embodiment 3

[0036] Mix 0.125 g of tetraammine palladium nitrate and 25 g of iron oxide and add it to a commercial 250 ml agate ball mill jar with a cover, and add 10 3 mm agate beads and 80 6 mm agate beads to it. Put the ball mill jar into the planetary ball mill QM3SP4L, set the ball milling conditions to rotate clockwise and counterclockwise alternately every 1.5 h, the two-way stop waiting time is 0, the frequency is 30 HZ, and the ball milling is 48 hours. Stopped for two or three times in the middle, took out the ball mill tank and stirred it with a plastic spoon, loosened the compacted oxide carrier, and continued to run. The ball-milled solid was put into a porcelain boat, and calcined in a muffle furnace or tube furnace at 600 °C in air for 2 h to obtain the corresponding single-atom catalyst material. Spherically aberration corrected TEM such as figure 2 PD 1 / Fe 2 o 3 shown.

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Abstract

The invention discloses a preparation method of a metal oxide loaded monatomic catalyst. The method comprises the following steps: 1. mechanical ball milling: dispersing a noble metal compound in a metal oxide by using a mechanical ball milling method to obtain a monatomic catalyst precursor with the noble metal content of 0.01-5wt%; and 2, high-temperature roasting: simply roasting the monatomiccatalyst precursor obtained in the step 1 in air, and cooling to room temperature to obtain the corresponding monatomic catalyst. By utilizing the ball mill, the noble metal compound can be uniformlydistributed in the oxide carrier in a fully dispersed state, and very good conditions are created for the formation and stabilization of metal single atoms. In the preparation process, almost no lossof raw materials is caused, and the concept of environmental protection is met. The method realizes simple preparation of the metal monatomic material, has good expansibility and reproducibility, andsolves the problems of low metal content, few types, complex preparation method, high cost, large carrier loss and the like in the prior art.

Description

technical field [0001] The invention relates to the technical field of material science and engineering, in particular to a method for preparing a metal oxide supported single-atom catalyst. Background technique [0002] Single-atom catalysts have both the active center of homogeneous catalysts and the characteristics of stable and easy separation of heterogeneous catalyst structures, which is a very important breakthrough to realize a unified "big" catalytic theory. Due to its superior catalytic performance, it has great application potential in industrial catalysis. [0003] To prepare single-atom catalysts, it is first necessary to consider loading isolated single atoms on the support to avoid agglomeration of metal atoms during preparation and use. In theory, two measures can be taken to increase the loading capacity of single-atom metals and avoid agglomeration: one is to increase the surface area of ​​the support, and the other is to enhance the interaction between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/46B01J23/52B01J23/60B01J23/656B01J23/755B01J23/89
CPCB01J23/8906B01J23/6562B01J23/52B01J23/42B01J23/464B01J23/60B01J23/755B01J23/8926B01J23/468B01J23/8913
Inventor 纪红兵张浩何晓辉何千孙青荻
Owner SUN YAT SEN UNIV
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