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Preparation method of PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia

An alloy catalyst and electrocatalysis technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of enhanced activity of synthetic ammonia and poor conductivity, and achieve the effect of promoting activation and dissociation, high specific surface area, and enhanced adsorption

Active Publication Date: 2021-12-21
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

Among many semiconductor materials, tungsten trioxide (WO 3 ) is favored by researchers for its stable performance, non-toxic and harmless, cheap raw materials and long research history. However, as an electrocatalyst in practical applications, there are still problems such as relatively poor electrical conductivity and the activity of ammonia synthesis needs to be further enhanced.

Method used

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  • Preparation method of PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia
  • Preparation method of PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia
  • Preparation method of PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia

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preparation example Construction

[0033] The preparation method of the PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia according to the present invention comprises the following steps:

[0034] 1) Preparation of WS by intercalation exfoliation method2 Nanosheets;

[0035] 2) WS prepared by step 1) 2 Preparation of WO from nanosheets 3 Nanosheets;

[0036] 3) by NaBH 4 Cooperative reduction of metal precursors to anchor PtCu alloy nanoparticles on WO 3 On nanosheets, PtCu alloy catalysts for efficient electrocatalytic synthesis of ammonia.

[0037] The concrete operation of step 1) is:

[0038] The block WS 2 Mix it with potassium sodium tartrate hydrate and grind it evenly, then put it into the reaction kettle and react at 150-250°C for 8-15h. During the reaction, the metal ion K + and Na + Insert block WS 2 The interlayer, while making the WS through the tartaric acid chain 2 The block expands, the reaction product is naturally cooled to room temperature, and then the reactio...

Embodiment 1

[0046] The preparation method of the PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia according to the present invention comprises the following steps:

[0047] 1) Preparation of WS by intercalation exfoliation method 2 Nanosheets;

[0048] The block WS 2 Mix it with potassium sodium tartrate hydrate and grind it evenly, then put it into the reaction kettle and react at 250°C for 10 hours. During the reaction, the metal ion K + and Na + Insert block WS 2 The interlayer, while making the WS through the tartaric acid chain 2 The block expands, the reaction product is naturally cooled to room temperature, and then the reaction product is placed in H 2 Ultrasonic crushing in O for 4 hours, wherein the power of the ultrasonic crushing instrument was 800kW to obtain the mixture, the mixture was centrifuged at 4000rpm, washed with ethanol and water, and then freeze-dried to obtain WS 2 nanosheets, where the bulk WS 2 The mass ratio to potassium sodium ta...

Embodiment 2

[0058] The preparation method of the PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia according to the present invention comprises the following steps:

[0059] 1) Preparation of WS by intercalation exfoliation method 2 Nanosheets;

[0060] The block WS 2 Mix it with potassium sodium tartrate hydrate and grind it evenly, then put it into the reaction kettle and react at 200°C for 10 hours. During the reaction, the metal ion K + and Na + Insert block WS 2 The interlayer, while making the WS through the tartaric acid chain 2 The block expands, the reaction product is naturally cooled to room temperature, and then the reaction product is placed in H 2 Ultrasonic crushing in O for 6 hours, wherein the power of the ultrasonic crushing instrument was 800kW to obtain the mixture, the mixture was centrifuged at 4000rpm, washed with ethanol and water, and then freeze-dried to obtain WS 2 nanosheets, where the bulk WS 2 The mass ratio to potassium sodium ta...

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Abstract

The invention discloses a preparation method of a PtCu alloy catalyst for efficient electrocatalytic synthesis of ammonia. The preparation method comprises the following steps: 1) preparing a WS2 nanosheet by adopting an intercalation stripping method; (2) preparing a WO3 nanosheet from the WS2 nanosheet prepared in the step (1); and 3) anchoring the PtCu alloy nanoparticles on the WO3 nanosheets through a NaBH4 synergistic reduction metal precursor method to obtain the PtCu alloy catalyst for efficiently electrocatalytically synthesizing ammonia. The catalyst prepared by the method has the characteristics of strong conductivity and excellent ammonia synthesis activity.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a PtCu alloy catalyst for high-efficiency electrocatalytic synthesis of ammonia. Background technique [0002] In nature, the nitrogen cycle plays a key role in sustaining life. Ammonia is one of the largest industrial synthetic chemicals in the world. At present, synthetic ammonia is widely used in agriculture, chemical industry, medicine, energy storage and other fields because of its high energy density, easy liquefaction and convenient transportation. At present, almost all ammonia in the industry is synthesized by the Haber-Bosch process, which requires high temperature and high pressure reaction conditions, and has problems such as high energy consumption and large greenhouse gas emissions. Therefore, it is a very promising, clean, efficient and sustainable ammonia synthesis route to use green and low-energy new technologies to drive nitrogen r...

Claims

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Application Information

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IPC IPC(8): C25B11/097C25B11/067C25B1/27
CPCC25B11/097C25B11/067C25B1/27Y02P20/52
Inventor 杨贵东赵瑛严孝清陈家和
Owner XI AN JIAOTONG UNIV
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