Patent ID: 9421520
Filing Date: 2016-08-23
CPC Classification: B01J,B82Y,C07B,C07C

Claim Text:
1. A process for preparing a platinum/carbon nanotube catalyst wherein platinum nanoparticles are exclusively loaded inside the tube cavities of carbon nanotubes, comprising steps of: 1) preparing carbon nanotube carriers by treating purified carbon nanotubes in nitric acid with a concentration of 65-68 wt % at 110-160° C. for 4-16 hours, filtering and washing the carbon nanotubes with water until pH value of the filtrate becomes neutral, drying the carbon nanotubes at 50-120° C. so as to obtain functionalized carbon nanotube carriers; 2) immersing the carbon nanotube carriers obtained in step 1) in an aqueous chloroplatinic acid solution and carrying out ultrasonic treatment at room temperature for 1-4 hours; 3) stirring the mixture of the carbon nanotubes and the aqueous chloroplatinic acid solution obtained in step 2) for 12-60 hours; 4) drying the material obtained in step 3) slowly at a heating rate of 0.5° C./min from room temperature to 110° C. and keeping at 110° C. for 12-48 hours; and 5) grinding the product obtained in step 4) to fine powders, reducing the fine powders with an aqueous sodium formate solution under a heating condition, filtering and washing the product with deionized water, and drying the product at 50-120° C. for 12-36 hours, so as to obtain a platinum/carbon nanotube catalyst wherein platinum nanoparticles are loaded inside the tube cavities of carbon nanotubes.