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Modified mesoporous carbon supported Pt nano catalyst and preparation method thereof

A nano-catalyst and mesoporous carbon technology, applied in the field of materials, can solve the problems of easy agglomeration of Pt nanoparticles, weak Pt nanoparticles, and weakened resistance to CO poisoning, and achieve good resistance, good CO poisoning ability, and inhibition The effect of reunion

Inactive Publication Date: 2011-11-16
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Pt nano-catalyst using activated carbon Vulcan XC-72, although the specific surface area of ​​activated carbon is relatively high, for example, the specific surface area of ​​the most commercially used activated carbon is 254m2 / g, but the activated carbon is almost 95% The above surface areas are all in the micropores, which are an important factor determining the adsorption performance of activated carbon, and the Pt nanoparticles adsorbed by the micropores are not strong, so the Pt nanoparticles are prone to agglomeration during the catalytic process, which directly leads to The active surface area of ​​the Pt catalyst is reduced, which in turn reduces the catalytic performance of the catalyst for methanol and weakens the ability to resist CO poisoning.

Method used

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  • Modified mesoporous carbon supported Pt nano catalyst and preparation method thereof
  • Modified mesoporous carbon supported Pt nano catalyst and preparation method thereof
  • Modified mesoporous carbon supported Pt nano catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040]1g of SBA-15, 1.25g of sucrose, 0.14g of sulfuric acid, 0.06g of nitric acid, 5g of water, and strong ultrasonic for 20min, first baked at 100°C for 6h, and then at 160°C for 6h. Grind the dark brown substance obtained, then add 0.8g sucrose, 0.09g sulfuric acid, 0.04g nitric acid and 5g water in the same proportion, repeat baking at 100°C and 160°C for 6h, and grind again, in Calcined in a quartz tube furnace at 900°C for 6 h under nitrogen atmosphere. Finally, infiltrate with 30 mL of 10% hydrofluoric acid (HF) for 24 hours, then filter, dry, grind and sieve with 200 mesh to obtain modified mesoporous carbon, which is named CMK-3-0.1

[0041] Dissolve 30.0 mg of modified mesoporous carbon in 20 mL of aqueous solution, raise the temperature to 40 °C, and stir magnetically at a stirring rate of 500 r / min. After 30 min, a carbon slurry is formed, and slowly add 7.7 mL of 0.5 mM H 2 PtCl 6 , add 22.6mg trisodium citrate as a metal protective agent, trisodium citrate mola...

Embodiment 2

[0043] 1g of SBA-15, 1.25g of sucrose, 0.14g of sulfuric acid, 0.14g of nitric acid, 5g of water, and strong ultrasonic for 20min, first baked at 100°C for 6h, and then at 160°C for 6h. Grind the obtained dark brown substance, then add 0.8g sucrose, 0.09g sulfuric acid, 0.09g nitric acid and 5g water in the same proportion, repeat baking at 100°C and 160°C for 6 hours, and grind again, Calcined at 900°C for 6h in a quartz tube furnace under nitrogen atmosphere. Finally, infiltrate with 30 mL of 10% hydrofluoric acid (HF) for 24 hours, then filter, dry, grind and sieve with 200 mesh to obtain modified mesoporous carbon, which is named CMK-3-0.23;

[0044] Dissolve 30.0mg of modified mesoporous carbon in 20mL of aqueous solution, raise the temperature to 40°C, stir magnetically, and control the stirring rate at 500r / min. After 30min, a carbon slurry is formed, and slowly add 7.7mL of 0.5mM H 2 PtCl 6 , add 22.6mg trisodium citrate as a metal protective agent, trisodium citrate...

Embodiment 3

[0046] 1g of SBA-15, 1.25g of sucrose, 0.14g of sulfuric acid, 0.31g of nitric acid, 5g of water, and strong ultrasonic for 20min, first baked at 100°C for 6h, and then at 160°C for 6h. Grind the obtained dark brown substance, then add 0.8g sucrose, 0.09g sulfuric acid, 0.20g nitric acid and 5g water in the same proportion, repeat baking at 100°C and 160°C for 6h, and grind again, Calcined at 900°C for 6h in a quartz tube furnace under nitrogen atmosphere. Finally, it was infiltrated with 30 mL of 10% hydrofluoric acid (HF) for 24 hours, then suction filtered, dried, ground and sieved with 200 mesh to obtain modified mesoporous carbon, which was named CMK-3-0.51;

[0047] Dissolve 30.0 mg of modified mesoporous carbon in 20 mL of aqueous solution, raise the temperature to 40 °C, and stir magnetically at a stirring rate of 500 r / min. After 30 min, a carbon slurry is formed, and slowly add 7.7 mL of 0.5 mM H 2 PtCl 6 , add 22.6mg trisodium citrate as a metal protective agent, ...

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Abstract

The invention discloses a modified mesoporous carbon supported Pt nano catalyst and a preparation method thereof. In the invention, mesoporous silicon oxide SBA-15 is used as a template, cane sugar is used as a carbon source, a certain amount of nitric acid is added to fire modified mesoporous carbon, Pt nano particles are further loaded, and finally the modified mesoporous carbon supported Pt nano catalyst is obtained. The nitric acid modified mesoporous carbon supported Pt nano catalyst has the advantages that: the modified mesoporous carbon has high hydrophily and more surface oxygen functional groups, so the agglomeration of Pt nano particles can be better inhibited and the catalytic effect of the Pt catalyst is improved; meanwhile, more toxic materials such as CO from the oxidizationprocess of methanol can be absorbed, so the stability of the Pt catalyst is improved.

Description

technical field [0001] The invention relates to a modified mesoporous carbon-supported Pt nanometer catalyst and a preparation method thereof, belonging to the field of materials. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of cheap fuel, easy storage and portability, high theoretical specific energy, and almost zero pollution emissions. It is one of the ideal power sources for various small portable power sources. However, there is still a large gap between the actual performance of DMFC and the theoretical performance. The preparation and search of highly active electrocatalysts is an important way to improve the performance of DMFC, and it has become the goal that researchers are constantly pursuing. [0003] At present, Pt-based catalysts are still the most widely used anode electrocatalysts in DMFCs. Usually, Pt-based catalysts are loaded on conductive high-specific-surface carbon supports to improve the dispersion of Pt nanoparticl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J35/10
Inventor 徐群杰李金光李巧霞云虹
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER