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Controllable preparation method of non-noble metal monatomic catalyst

A non-precious metal and catalyst technology, applied in the field of controllable preparation of non-precious metal single-atom catalysts, can solve problems such as lack of solutions, and achieve the effects of improving atom utilization, high catalytic activity, and strong stability

Inactive Publication Date: 2017-08-29
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there is still a lack of effective solutions for the preparation of non-noble metal single-atom catalysts in the prior art

Method used

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  • Controllable preparation method of non-noble metal monatomic catalyst
  • Controllable preparation method of non-noble metal monatomic catalyst
  • Controllable preparation method of non-noble metal monatomic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, potassium permanganate is used to oxidize graphene to prepare graphene oxide: commercial graphite powder is treated in a mixture of sulfuric acid and potassium permanganate by Hummers method to obtain graphene oxide. The obtained brown product is a graphite flake with derivatized carboxylic acid groups on the edge and mainly phenolic hydroxyl groups and epoxy groups on the plane, which is exfoliated into graphene oxide by ultrasonic or high-shear vigorous stirring. Oxygen-containing functional groups such as hydroxyl, carboxyl and epoxy groups were prepared on graphene.

[0036] Weigh 0.0255g of graphene oxide and pour it into a beaker, add 10ml of ethanol, and sonicate for 2 hours. Weigh 0.0257g of graphene oxide and pour it into a beaker, add 10ml of methanol, and sonicate for 2 hours. Weigh 2.7304g Fe(C 5 h 7 o 2 ) 3 ·7H 2 O was put into a round-bottomed flask, and 25ml of deionized water was added to adjust the pH to 6.0. Start the ...

Embodiment 2

[0038] Weigh 0.8772g CuSO 4 ·5H 2O and 1.8599 g FeCl 3 ·7H 2 O was put into a round-bottomed flask, added 25ml of deionized water, adjusted to pH 4.0, started the electric mixer, and stirred at 20°C for 30 minutes. Then the graphene oxide dispersion was mixed with the metal salt solution and sonicated at 60 °C for 2 h. Weigh 0.2099gNaBH 4 Dissolve in 10ml deionized water, NaBH 4 The solution was dropped dropwise into the mixed solution of the graphene oxide dispersion and the metal salt, reacted for 0.5 hour, and the obtained product was centrifuged and washed three times with deionized water. Finally put it into a freeze dryer to freeze dry. The metal atom loading capacity of the obtained single-atom catalyst is 1%, and the utilization efficiency of copper and iron metal atoms can reach 99.5%.

Embodiment 3

[0040] Weigh 0.0257g of graphene oxide and pour it into a beaker, add 10ml of methanol, and sonicate for 2 hours. Weigh 2.5304gFeCl 3 ·7H 2 O was put into a round-bottomed flask, and 25ml of deionized water was added to adjust the pH to 6.0. Start the electric mixer and stir for 30 minutes at 20°C. Then the graphene oxide dispersion was mixed with the metal salt solution and sonicated at 60 °C for 2 h. Weigh 0.2099g KBH 4 Dissolve KBH in 10ml deionized water 4 The solution was dropped dropwise into the mixed solution of the graphene oxide dispersion and the metal salt, reacted for 0.5 hour, and the obtained product was centrifuged and washed three times with deionized water. Finally put it into a freeze dryer to freeze dry. The metal atom loading capacity of the obtained single-atom catalyst is 5%, and the iron metal atom utilization efficiency can reach 100%.

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Abstract

The invention discloses a controllable preparation method of a non-noble metal monatomic catalyst and aims at solving the problem of absence of a preparation method of the non-noble metal monatomic catalyst in the prior art. The cost of the catalyst is reduced, the atom utilization rate is improved, and the prepared monatomic catalyst has the advantages of high catalytic activity and high stability. According to the technical scheme, the controllable preparation method comprises the following steps of (1) an oxygen-containing functional group is prepared on a porous carrier material by using a mixed acid oxidation method; (2) an oxidized porous carrier dispersion is mixed with a water solution of a non-noble metal salt, non-noble metal cations and the oxygen-containing functional group on a porous carrier are subjected to fixed-point reaction and loaded to the porous material; and (3) the non-noble metal cations loaded on the porous material are subjected to in-situ reduction by adopting a reducing agent to prepare the non-noble metal monatomic catalyst.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency industrial catalyst preparation, and specifically relates to a controllable preparation method of a non-noble metal single-atom catalyst, which uses a functionalized carrier to react with non-noble metal salts such as copper and iron at a fixed point, and then uses a strong reducing agent for in-situ reduction. The metal cations loaded on the carrier are converted into metal single atoms, realizing the controllable preparation of non-noble metal single atom catalysts. Background technique [0002] Single-atom catalysts are an emerging research hotspot in the field of heterogeneous catalysis, which means that the active components in the catalyst exist completely in the form of isolated single atoms, and are stabilized by interacting with supports or forming alloys with second metals. Compared with nano / subnanometer catalysts, single-atom catalysts have many advantages: (1) the active compo...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/00B01J37/16B01J35/10
CPCB01J23/745B01J37/00B01J37/16B01J35/60
Inventor 张其坤王帅花马晓晔张慧超
Owner SHANDONG NORMAL UNIV
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