Supported noble metal compound as well as preparation and application thereof

A technology of noble metals and compounds, applied in electrolytic components, electrodes, electrolytic processes, etc., can solve the problems of complex preparation process of noble metal compound catalysts, high-temperature reactions, etc., and achieve the effects of improving selectivity and activity, mild reaction conditions, and simple operation

Active Publication Date: 2022-03-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the problem that the preparation process of the existing noble metal compound catalyst is complex and requires high-temperature reaction, and proposes a solid-phase reaction method to synthesize the supported noble metal compound catalyst

Method used

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  • Supported noble metal compound as well as preparation and application thereof
  • Supported noble metal compound as well as preparation and application thereof
  • Supported noble metal compound as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The first step: uniformly disperse chloroplatinic acid and Vulcan carbon in water, stir for 30 minutes, and the loading of Pt is 10%;

[0030] The second step: the solution obtained in the first step is heated and stirred, and the solution is evaporated to dryness to obtain a solid powder precursor (Pt accounts for 10% of the mass fraction of the solid powder precursor), and the obtained solid powder precursor is mixed in argon / hydrogen atmosphere, heated at 150°C for 1h to obtain a carbon-supported platinum precursor, and the heating rate was 10°C / min;

[0031] Step 3: Put the carbon-supported platinum single substance precursor and sulfur powder obtained in the second step in two magnetic boats at a ratio of 1:10, and heat in argon / hydrogen mixed gas at 250°C for 1 hour, and the sulfur powder Sublimation and reaction with the carbon-supported platinum single substance precursor to obtain a carbon-supported platinum sulfide catalyst, wherein the heating rate is 10°C / mi...

Embodiment 2

[0033] The first step: uniformly disperse chloroplatinic acid and Vulcan carbon in water, stir for 30 minutes, and the loading of Pt is 5%;

[0034] The second step: the solution obtained in the first step is heated and stirred, and the solution is evaporated to dryness to obtain a solid powder precursor (Pt accounts for 5% of the mass fraction of the solid powder precursor), and the obtained solid powder precursor is mixed in argon / hydrogen atmosphere, heated at 150°C for 1h to obtain a carbon-supported platinum precursor, and the heating rate was 10°C / min;

[0035] Step 3: Put the carbon-supported platinum simple substance precursor and selenium powder obtained in the second step in two magnetic boats at a ratio of 1:15, heat in argon at 350°C for 1 hour, and sublimate the selenium powder with The carbon-supported platinum simple substance precursor is reacted to obtain a carbon-supported platinum diselenide catalyst, wherein the heating rate is 10°C / min, and selenium powder...

Embodiment 3

[0037] The first step: uniformly disperse potassium chloroplatinate and carbon nanotubes in water, stir for 30 minutes, and the loading of Pt is 20%;

[0038] The second step: the solution obtained in the first step is heated and stirred, and the solution is evaporated to dryness to obtain a solid powder precursor (Pt accounts for 20% of the mass fraction of the solid powder precursor), and the obtained solid powder precursor is mixed in argon / hydrogen atmosphere, heated at 150°C for 1h to obtain a carbon-supported platinum precursor, and the heating rate was 10°C / min;

[0039] The third step: put the carbon-supported platinum simple substance precursor obtained in the second step and the tellurium powder in two magnetic boats at a ratio of 1:2, and heat at 450°C for 1 hour in argon gas, and the tellurium powder sublimates, and The carbon-supported platinum simple substance precursor is reacted to obtain a carbon-supported platinum ditelluride catalyst, wherein the heating rat...

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Abstract

The invention relates to a supported noble metal compound as well as preparation and application thereof, and belongs to the technical field of electrosynthesis. The preparation method comprises the following steps: dispersing a noble metal salt and a carbon carrier into water, and then heating to evaporate a solvent to dryness, so that the noble metal salt is adsorbed on the carbon carrier to obtain a solid powder precursor; the solid powder precursor is heated in a reducing atmosphere, so that the precious metal salt is reduced to obtain a precious metal simple substance, and an intermediate product is obtained; and reacting the intermediate product with a gas obtained after sublimation of a chalcogen nonmetal simple substance in a reducing atmosphere, or directly reacting in an oxygen-containing atmosphere at 250-450 DEG C to obtain the carbon-supported noble metal compound. The obtained catalyst shows excellent hydrogen peroxide electrosynthesis selectivity and stability, the preparation process is simple, and the catalyst is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrosynthesis, and more specifically relates to a loaded noble metal compound and its preparation and application. Background technique [0002] As a high-value chemical, hydrogen peroxide is widely used in chemical synthesis, pulp bleaching, environmental treatment and hydrogen peroxide fuel cells. Electrosynthesis (oxygen reduction reaction) of hydrogen peroxide requires only water and oxygen as raw materials, providing an economical and environmentally friendly synthesis process. However, the oxygen reduction reaction involves a four-electron process to produce water and a two-electron pathway to hydrogen peroxide. At present, Pt-based alloy materials are widely studied catalysts for the electrosynthesis of hydrogen peroxide. Alloy catalysts such as PtHg show high activity and selectivity for hydrogen peroxide, but Hg is easy to dissolve and is highly toxic, which is not suitable for large-scale ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/065C25B11/075C25B11/054C25B1/30
CPCC25B11/065C25B11/075C25B11/054C25B1/30Y02E60/50
Inventor 王得丽宋敏张建
Owner HUAZHONG UNIV OF SCI & TECH
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