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Method for preparing carbon-supported Pd nano catalyst by utilization of NH4F modified processed carbon nano-material

A technology of carbon nanomaterials and nanocatalysts, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of destroying the original structure, uneven active sites, etc. problems, to achieve broad application prospects, easy control of process parameters, and improved utilization

Active Publication Date: 2015-09-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can improve the loading effect of carbon nanomaterials to a certain extent and improve the electrocatalytic activity of supported noble metals, these modification methods destroy the original structure of MWCNTs to a certain extent, and the modified active sites are not uniform enough. , sometimes agglomeration occurs, which inhibits the electrocatalytic activity of the catalyst

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  • Method for preparing carbon-supported Pd nano catalyst by utilization of NH4F modified processed carbon nano-material
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  • Method for preparing carbon-supported Pd nano catalyst by utilization of NH4F modified processed carbon nano-material

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Embodiment 1

[0028] The use of NH 4 The method for preparing carbon-supported Pd nanocatalysts by F modification treatment carbon nanomaterials, its concrete steps are as follows:

[0029] (1) NH 4 F Modification treatment of carbon nanomaterials: First, add 1mol / L NaOH solution to 200mg carbon nanotubes with a diameter of 20-40nm according to the liquid-solid ratio of 200:40mg / ml, and stir for 6h after ultrasonication for 10min. Wash with distilled water, then add 1mol / LNH to the filtrate according to the liquid-solid ratio of 200:40mg / ml 4 The F solution was continuously stirred for 6 hours. After the stirring was completed, it was filtered with suction and washed with distilled water until there were no fluoride ions. It was vacuum-dried at a constant temperature at 60°C for 12 hours, and cooled naturally to room temperature to obtain NH 4F modified carbon nanomaterials;

[0030] (2) Synthesis of Pd nanocolloids: acetone, polyethylene glycol-400, 0.325mg / mlH 2 PdCl 4 Mix the soluti...

Embodiment 2

[0034] The use of NH 4 The method for preparing carbon-supported Pd nanocatalysts by F modification treatment carbon nanomaterials, its concrete steps are as follows:

[0035] (1) NH 4 F Modification treatment of carbon nanomaterials: First, add 1mol / L NaOH solution to 200mg carbon nanotubes with a diameter of 40-60nm according to the liquid-solid ratio of 200:40mg / ml, and stir for 6h after ultrasonication for 10min. Wash with distilled water, then add 0.8mol / LNH to the filtrate according to the liquid-solid ratio of 200:40mg / ml 4 The F solution was continuously stirred for 6 hours. After the stirring was completed, it was filtered with suction and washed with distilled water until there were no fluoride ions. It was vacuum-dried at a constant temperature at 60°C for 12 hours, and cooled naturally to room temperature to obtain NH 4 F modified carbon nanomaterials;

[0036] (2) Synthesis of Pd nanocolloids: acetone, polyethylene glycol-400, 0.325mg / mlH 2 PdCl 4 Mix the sol...

Embodiment 3

[0040] The use of NH 4 The method for preparing carbon-supported Pd nanocatalysts by F modification treatment carbon nanomaterials, its concrete steps are as follows:

[0041] (1) NH 4 F Modification treatment of carbon nanomaterials: First, add 1mol / L NaOH solution to 200mg carbon nanotubes with a diameter of 60-100nm according to the liquid-solid ratio of 200:40mg / ml, and stir for 6h after ultrasonication for 10min. Wash with distilled water, then add 0.6mol / LNH to the filtrate according to the liquid-solid ratio of 200:40mg / ml 4 The F solution was continuously stirred for 6 hours. After the stirring was completed, it was filtered with suction and washed with distilled water until there were no fluoride ions. It was vacuum-dried at a constant temperature at 60°C for 12 hours, and cooled naturally to room temperature to obtain NH 4 F modified carbon nanomaterials;

[0042] (2) Synthesis of Pd nanocolloids: acetone, polyethylene glycol-400, 0.325mg / mlH 2 PdCl 4 Mix the so...

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Abstract

The invention relates to a method for preparing a carbon-supported Pd nano catalyst by utilization of NH4F modified processed carbon nano-material, and belongs to the catalyst preparation technology field. First, a NaOH solution is added in a carbon nano-material, hyperacoustic processing is carried out, then stirring is carried out, a NH4F solution is added after pumping filtration, continuous stirring is carried out, then pumping filtration and distilled water cleaning are carried out until no fluorinion exists, drying is carried out, cooling to the room temperature is carried out, and a NH4F modified processed carbon nano-material is obtained. Acetone, polyethylene glycol-400 and H2PdC14 solutions are mixed uniformly, irradiation in ultraviolet light is carried out, and Pd nano colloid can be obtained. The NH4F modified processed carbon nano-material and the prepared Pd nano colloid are mixed, continuous stirring, vacuum pumping filtration, distilled water cleaning and vacuum drying are carried out, and a carbon-supported Pd nano catalyst is obtained. Tube walls of MWCNTs are connected with fluoro groups (-F)(-N) by utilization of NH4F, and thus the dispersibility is good.

Description

technical field [0001] The present invention relates to a kind of utilizing NH 4 The invention discloses a method for preparing carbon-supported Pd nano-catalysts by modifying and treating carbon nano-materials, and belongs to the technical field of catalyst preparation. Background technique [0002] A fuel cell is a conversion device that directly converts energy stored in fuel and oxidant from one form (chemical energy) to another (electrical energy) through an electrochemical reaction. In fuel cell technology, especially direct methanol fuel cell (DMFC) has the characteristics of abundant fuel source, simple structure, high energy density, convenient storage and portability, low working temperature, high safety, and environmental protection, etc. It is a research hotspot and has been widely used in the fields of automobile power supply, portable mobile power supply, artificial satellite and spacecraft power supply, etc. It is considered to be the most promising portable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
Inventor 徐明丽张英杰张晓凤董鹏杨喜昆夏书标段奔
Owner KUNMING UNIV OF SCI & TECH