Method for spreading noble metal on iron particle surface

Abstract

A method for spreading noble metal on an iron particle surface includes: providing a plurality of iron particles, cleaning the iron particles up and separating the iron particles from cleaning water, drying the iron particles, placing the iron particles into a heater oven with a reaction gas, heating the iron particles for oxidation reduction, placing the iron articles into a noble-metal-ion solution for immersion plating, processing the iron particles with a solid-and-liquid separation, and then drying the iron particles. Wherein the heating temperature of the heating oven ranges from 300 to 500 degrees centigrade and the duration thereof ranges from 3 to 5 hours. Whereby, the iron particles are activated first in order to react with the noble metal so that the activity and the uniformity of the noble metal attached to the iron surface is improved.

1 . A method for spreading noble metal on an iron particle surface, comprising: 
 providing a plurality of iron particles;    cleaning the iron particles and separating the iron particles from cleaning water;    drying the iron particles;    placing the iron particles into a heater oven with a reaction gas;    heating the iron particles for oxidation reduction with a heating temperature ranging from 300 to 500 degrees centigrade and a duration ranging from 3 to 5 hours;    placing the iron articles in a noble-metal-ion solution for immersion plating; and    processing the iron particles with a solid-and-liquid separation after the immersion plating step, and then drying the iron particles.    
   
   
       2 . The method as claimed in  claim 1 , wherein the step of immersion plating includes: 
 applying a high-speed centrifugal dewaterer for at least 5 minutes.    
   
   
       3 . The method as claimed in  claim 1 , wherein the step of drying includes: 
 applying a freeze dryer for at least 12 hours in which conditions thereof are about −55 degrees centigrade and 0.2 Torr.    
   
   
       4 . The method as claimed in  claim 1 , wherein the reaction gas includes hydrogen mixing with nitrogen.  
   
   
       5 . The method as claimed in  claim 4 , wherein the hydrogen mixes with the nitrogen at a ratio of about 1:4.  
   
   
       6 . The method as claimed in  claim 4 , wherein the hydrogen and the nitrogen are mixed and inputted into the heater oven at about 400 degrees centigrade (400° C.), the heater oven provides a heating profile that increases the temperature from room temperature to about 150 degrees centigrade (150° C.) at the rate of about 10 degrees centigrade per minute (10° C./min), maintains that temperature for about 30 minutes, then increases to about 400 degrees centigrade (400° C.), maintaining at about 400 degrees centigrade (400° C.) for about 3 hours, and returning back to room temperature.  
   
   
       7 . The method as claimed in  claim 6 , wherein the iron particles are cleaned up by pure nitrogen gas the temperature in the heating oven returns back to room temperature.  
   
   
       8 . The method as claimed in  claim 7 , wherein the pure nitrogen gas is provided for about 15 minutes with a flow rate of about 250 milliliters per minute (250 mL/min).  
   
   
       9 . The method as claimed in  claim 1 , wherein the solution includes a noble-metal-ion at a concentration of 100 milligrams per liter (100 mg/L).