Spent palladium carbon catalyst refers to the carbon material used in the catalytic reaction, but as the catalytic reaction progresses, its surface structure and properties gradually change, and it no longer has good catalytic activity, resulting in pollution. Therefore, an effective spent palladium carbon catalyst is very important. In this paper, the effective methods of spent palladium carbon catalysts are reviewed, including chemical activation, physical activation, chemical oxidation, and supercritical fluid technology.
1. Chemical activation.
Chemical activation is a mild method of spent palladium-carbon catalyst**, which uses a certain mass concentration of active agent to treat the spent palladium-carbon catalyst to restore the catalytic activity of the catalyst. The active agent can effectively dissolve the pollutants in the spent palladium carbon catalyst, thereby improving the activity of the catalyst and restoring the activity of the catalyst to a certain extent.
2. Physics**.
Physics refers to the use of an appropriate physical method to remove pollutants from spent palladium-carbon catalysts, so as to restore the activity of the catalyst. The main methods of physics include vibrating sieving method, high-pressure gas purging method, hot air spray method, ultrasonic method, etc.
3. Chemical oxidation.
The chemical oxidation method uses oxygen or other oxidants to react with the waste palladium carbon catalyst to oxidize the pollutants, thereby removing the pollutants and restoring the activity of the catalyst.
4. Supercritical fluid technology.
Supercritical fluid technology uses supercritical fluids (such as hydrogen, liquid nitrogen, etc.) as solvents to dissolve the pollutants in the spent palladium-carbon catalyst, thereby restoring the activity of the catalyst.
Conclusion: The effective methods of spent palladium-carbon catalysts mainly include chemical activation, physical progression, chemical oxidation and supercritical fluid technology. Although these methods have certain effects, in general, in order to be more effective in the waste palladium carbon catalyst, it is also necessary to combine existing technologies to develop more effective methods.
In this paper, we review the effective methods of spent palladium-carbon catalysts, including chemical activation, physics, chemical oxidation, and supercritical fluid technology. These methods have certain effects, but in order to be more effective, it is still necessary to combine existing technologies to develop more effective methods.