The preparation methods of CNTS loaded metal nanoparticles are mainly physical preparation and chemical preparation methods. The most commonly used is chemical preparation method. The chemical preparation method is generally uniformly loaded with metal nanoparticles on the carrier CNTS. The general process of chemical preparation is that the metal front drive is restored to atoms, and the metal atom grows into nanoparticles, and a catalyst of a certain particle size is obtained by the action of the carrier or stabilizer. Different preparation methods can obtain catalysts with different sizes and different appearances. The specific method is as follows:
1. Immersion reduction method
Immersion reduction method is a traditional method for preparing load catalysts. The specific preparation process of preparing the CNTS load metal nanoparticle catalyst is as follows: under a certain temperature and a certain pH, the salt solution of the metal front drive is fully immersed in the carrier to fully mix it with the carrier, and then adjust the pH value of the solution to make the metal metal The ion is uniformly adsorbed on the carrier, and then adds excessive reducing agents (such as N2H4, NABH4, CH3OH, etc.) to the solution, so as to obtain a metal nanoparticles catalyst with CNTS load. The process of immersion and reducing the legal system is relatively simple, the cost is relatively low, and it is easier to operate. However, the size distribution of metal nanopartal particles in the load catalyst prepared by this method is wide and the particle size is not easy to control.
2. Ethylene glycol reduction method

Etanol restoration method has been widely used in the preparation of CNTS load metal nanoparticles catalysts. Ethylene glycol restoration method
The preparation process is specifically: using ethylene glycol as a reducing agent, and ethylene glycol is also used as a solvent when used. Firstly, the precursor of the metal particles is dissolved in the ethylene glycol solution. The pH value of the solution is alkaline environment, and then after a period of heating the constant temperature of the solution at a certain temperature, metal ions are restored as metal nanoparticles. After the solution cools down On the carrier CNTS, the metal nanoparticle catalyst that is prepared by the CNTS load is prepared. The method of preparing load catalysts for this ethan glycol restoration method is simple, and the average granularity of the prepared catalysts is good, which can be used for actual production.
3. Electrochemical deposition method
The method of electrochemical deposition method is essentially the use of constant potential deposition, circulating ambush, and square wave scanning electrochemical methods to directly restore metal cations and deposit to the surface of the carrier WMCNTS. Under the influence of the potential or current, mix with the electrolyte solution, and directly restore the metal cation and deposit to the surface of the carrier MWCNTS. This method of preparing load catalysts through electrochemical deposition method cannot control the content of each component well, and the size of the catalyst cannot be effectively controlled.
4. Microcytosis

Microcal method is to limit the metal front -wheel drive to the micro emissions containing metal front -containing front -containing front -containing front -containing front -containing front -containing front -containing preparations. Add metal front -drives and reducing agents to the micro -emulsion system. Under the appropriate pH value and appropriate temperature conditions, metal ions can be restored to obtain metal particles in a micro -emulsion. This method can avoid controlling the composition of metal particles on the surface of the catalyst by changing the proportion of different metal front -drives. At the same time, it can control the size of the metal particles by controlling the size of the micro -emulsion drip, but this method is more complicated to prepare the process.

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