S-doped carbon material supported Pt composite catalyst and preparation method and application thereof

A composite catalyst, carbon material technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor stability, low utilization rate of Pt, low catalyst activity, etc. The effect of high utilization rate, excellent catalytic activity and stability

Inactive Publication Date: 2019-05-28
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome the problems of low catalyst activity, low Pt utilization rate and poor stability of the above-mentioned existing fuel cells, and to provide a preparation method of S-doped carbon material loaded Pt composite catalyst. The catalyst can improve the dispersion of supported Pt, increase the utilization rate of Pt, and also improve the stability of Pt catalyst

Method used

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  • S-doped carbon material supported Pt composite catalyst and preparation method and application thereof
  • S-doped carbon material supported Pt composite catalyst and preparation method and application thereof
  • S-doped carbon material supported Pt composite catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1 Preparation of a S-doped carbon material supported Pt composite catalyst

[0043] Prepare S-doped carbon-supported Pt composite catalyst by the following method, comprising the following steps:

[0044] (1) Add carbon nanotubes and thiourea (mass ratio 1:1) to ethanol for ultrasonic mixing, and stir and heat the ultrasonically uniform mixture at 100°C until the solvent evaporates to dryness;

[0045] (2) The product of step (1) was dried and ground, calcined at 800°C for 3 h in an inert nitrogen gas, and taken out after cooling down in the tube furnace to obtain an S-doped carbon support;

[0046] (3) Loading precious metal Pt by impregnation method: Stir the S-doped carbon carrier in distilled water for ultrasonic dispersion, then add metal platinum salt precursor chloroplatinic acid, adjust the pH of the solution to 8.5 with KOH after ultrasonic stirring, and place it at a constant temperature of 60 °C Stirring for 1.5 h, cooling to room temperature, suctio...

Embodiment 2

[0048] Example 2 Preparation of a S-doped carbon material supported Pt composite catalyst

[0049] The preparation of S-doped carbon material loaded Pt composite catalyst comprises the following steps:

[0050] (1) Add carbon nanotubes and thiourea (mass ratio 0.25:1) to ethanol for ultrasonic mixing, stir and heat the ultrasonically uniform mixture at 70°C until the solvent evaporates to dryness;

[0051] (2) The product of step (1) was dried and ground, calcined at 700°C for 4 h in an inert nitrogen gas, and taken out after cooling down in the tube furnace to obtain an S-doped carbon support;

[0052] (3) Loading precious metal Pt by impregnation method: Stir the S-doped carbon carrier in distilled water and disperse it ultrasonically, then add the metal platinum salt precursor chloroplatinic acid, adjust the pH of the solution to 8.1 with KOH after ultrasonic stirring, and place it at a constant temperature of 55°C Stirring for 1 h, cooling to room temperature, suction fil...

Embodiment 3

[0054] Example 3 Preparation of a S-doped carbon material supported Pt composite catalyst

[0055] The preparation of S-doped carbon material loaded Pt composite catalyst comprises the following steps:

[0056] (1) Add carbon nanotubes and thiourea (mass ratio 4:1) to ethanol for ultrasonic mixing, and stir and heat the ultrasonically uniform mixture at 110°C until the solvent evaporates to dryness;

[0057] (2) The product of step (1) was dried and ground, calcined at 900°C for 2 h in an inert nitrogen gas, and taken out after cooling down in the tube furnace to obtain an S-doped carbon support;

[0058] (3) Loading noble metal Pt by impregnation method: Stir the S-doped carbon carrier in distilled water for ultrasonic dispersion, then add metal platinum salt precursor chloroplatinic acid, adjust the pH of the solution to 8.9 with KOH after ultrasonic stirring, and place it at a constant temperature of 65°C Stir for 2 h, cool to room temperature, suction filter, wash, and dr...

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Abstract

The invention discloses an S-doped carbon material supported Pt composite catalyst and a preparation method and application thereof. The method comprises the following steps: adding a carbon materialand a sulfur source into ethanol, and carrying out ultrasonic mixing to obtain a uniformly mixed suspension; stirring and heating the suspension until the solvent is evaporated to dryness; after drying, grinding, and calcining in inert gas at high temperature to obtain an S-doped carbon carrier; stirring and ultrasonically dispersing in distilled water, adding a metal platinum salt precursor, ultrasonically stirring uniformly, adjusting the pH value, stirring at constant temperature, cooling to room temperature, performing suction filtration, washing, drying, grinding, and reducing in a hydrogen atmosphere. The S-doped carbon material is prepared by adopting a high-temperature annealing method, and the high-dispersion Pt catalyst is loaded by adopting an impregnation method, so that the preparation method is simple and effective, and the loaded Pt catalyst is uniform in morphology, high in dispersity and high in Pt utilization rate, has excellent electrocatalytic performance and stability, and has a good application prospect in the field of electrocatalysis.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and electrooxidative conversion of glycerin. More specifically, it relates to an S-doped carbon material supported Pt composite catalyst and its preparation method and application. Background technique [0002] With the development of social productivity, fossil energy is decreasing day by day, environmental pollution is increasing, and there is an urgent need to develop renewable energy. Among them, direct alcohol fuel cells have received extensive attention. Compared with hydrogen fuel cells, alcohols, as liquids, can be conveniently transported and stored, and have higher energy density. Among them, glycerin, as the main by-product in the biodiesel production process, has the advantages of low price, non-toxicity, and wide source, etc. It can be converted into electricity by electro-oxidation, and the products in the oxidation process are all high-value-added fine chemicals prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92C25B11/08B01J27/045B01J37/34B01J37/08
CPCY02E60/50
Inventor 宁小媚占亮周小松罗金马琳徐旭耀
Owner LINGNAN NORMAL UNIV
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