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Preparation method of metal monatomic site catalyst

A catalyst and atomic technology, applied in the field of catalyst material synthesis, to achieve uniform particle size distribution, low toxicity, and small product particles

Active Publication Date: 2018-01-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous development of material synthesis technology, humans have made great progress in the preparation of micro- and meso-scale materials, but the synthesis and regulation of metal single-atom site catalysts still face major challenges

Method used

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  • Preparation method of metal monatomic site catalyst
  • Preparation method of metal monatomic site catalyst
  • Preparation method of metal monatomic site catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Dissolve 88 milligrams (mg) of platinum(II) acetylacetonate and 1.069 grams (g) of zinc nitrate hexahydrate in 15 milliliters (ml) of methanol, and add 1.161 grams (g) of 2-methylimidazole to 10 milliliters (ml) of methanol In the method, pour 2-methylimidazole methanol solution into the methanol solution of platinum (II) acetylacetonate and zinc nitrate hexahydrate, stir vigorously for 5 minutes, let stand for 20 hours, wash the precipitate obtained by the reaction with methanol 4 times, Dry in a vacuum oven, put the obtained powder into a magnetic boat after a little grinding, and place it in a tube furnace for heating. The heating atmosphere is nitrogen or argon. Before heating, the air in the tube furnace is replaced with an inert gas three times. The heating temperature was 900°C, the heating rate was 5°C per minute, and the heating time was 3 hours. After calcination, it was cooled to room temperature to obtain a black platinum single-atom site catalyst. Such as ...

Embodiment 2

[0037] Dissolve 176mg iridium(III) acetylacetonate and 1.069g zinc nitrate hexahydrate in 15ml methanol, add 1.161g 2-methylimidazole in 10ml methanol, pour 2-methylimidazole methanol solution into iridium(III) acetylacetonate and methanol solution of zinc nitrate hexahydrate, vigorously stirred for 5 minutes, and stood still for 20 hours. The precipitate obtained from the reaction was washed 4 times with methanol, dried in a vacuum oven, and the obtained powder was slightly ground and placed in a magnetic boat. , placed in a tube furnace for heating, the heating atmosphere is nitrogen or argon, the air in the tube furnace is replaced with an inert gas three times before heating, the heating temperature is 900°C, the heating rate is 5°C per minute, and the heating time is 3 After calcination and cooling to room temperature, a black iridium single-atom site catalyst was obtained. Such as figure 2 As shown, the iridium atoms are in a monatomic dispersed state.

Embodiment 3

[0039]Dissolve 69mg of palladium(II) acetylacetonate and 1.069g of zinc nitrate hexahydrate in 30ml of methanol, add 1.161g of 2-methylimidazole in 10ml of methanol, pour the 2-methylimidazole methanol solution into palladium(II) acetylacetonate and methanol solution of zinc nitrate hexahydrate, vigorously stirred for 5 minutes, and stood still for 20 hours. The precipitate obtained from the reaction was washed 4 times with methanol, dried in a vacuum oven, and the obtained powder was slightly ground and placed in a magnetic boat. , placed in a tube furnace for heating, the heating atmosphere is nitrogen or argon, the air in the tube furnace is replaced with an inert gas three times before heating, the heating temperature is 800°C, the heating rate is 5°C per minute, and the heating time is 3 After calcination and cooling to room temperature, a black palladium single-atom site catalyst was obtained. Such as image 3 As shown, the palladium atoms are in single-atom dispersed s...

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Abstract

The invention provides a preparation method of a metal monatomic site catalyst. According to the synthetic strategy, a porous complex composite material coated with an acetylacetone metal salt is formed from a zinc compound and an imidazole organic ligand through coordination in a methanol solution of the acetylacetone metal salt, and then a porous carbon support doped with nonmetal heteroatomic nitrogen is formed from the imidazole organic ligand through a high-temperature pyrolytic reaction in an inert gas atmosphere, wherein metal atoms interact with surrounding nonmetal heteroatomic nitrogen and exist in the form of single atoms. The method is simple, safe, low in cost and applicable to synthesis of various noble metal and non-noble metal monatomic site catalysts, and the obtained metal monatomic site catalyst is high in metal concentration and good in heat stability, can be applied to the fields of energy, catalysis, medicine, biology and the like and has quite broad market prospect.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a metal single-atom site catalyst, and belongs to the technical field of catalyst material synthesis. Background technique [0002] The energy problem is a key problem encountered in the progress and sustainable development of human society. Solid catalysts with metals, especially noble metals, as the main active components play an irreplaceable role in the process of energy production and conversion. Therefore, the development of high-efficiency, low-cost, and stable metal catalysts is the key to solving energy problems. Metal single-atom site catalysts may not only show better performance than traditional solid catalysts in some reactions, but in-depth research on metal single-atom site catalysis may also change people's understanding of the nature of solid catalyst activity. Therefore, the field of synthesis and catalysis of metal single-atom sites ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/08B01J23/28B01J23/34B01J23/42B01J23/44B01J23/46B01J23/72B01J23/745B01J23/755B01J37/03B01J37/08
Inventor 李亚栋李治王定胜彭卿陈晨陈文星陈远均李启恒
Owner TSINGHUA UNIV
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