1. Good high-temperature oxidation and corrosion resistance. Graphite has good oxidation and corrosion resistance at high temperatures, which can effectively prevent precious metals such as palladium and platinum from oxidizing and corroding under high temperature reaction conditions, and prolong their service life.
2. Good carrier effect at high temperature. Graphite can provide support for tiny precious metal particles under high temperature conditions to prevent them from agglomerating and growing, keeping them highly dispersed, thereby exhibiting higher catalytic activity. This effect is called the carrier effect.
3. Good chemical inertness and thermal stability. Graphite has high chemical inertness and thermal stability, and can be used stably for a long time under harsh chemical reaction conditions and high temperature environments without significant changes in structure and properties.
4. High electrical conductivity. Graphite has very high electrical conductivity, which facilitates the migration and transfer of electrons, can increase the catalytic activity of precious metals, and plays an important role especially in electrocatalytic reactions.
5. High specific surface area. Graphite has a developed porous structure and high specific surface area, which helps precious metals to contact the reactant, thereby increasing reaction activity and selectivity.
6. Low cost. Graphite is a natural mineral resource, and large-scale production of graphite products has a low cost, which helps the commercialization of precious metal catalysts and other applications.
Therefore, graphite is an ideal carrier material for precious metals. It can impart excellent catalytic performance and long-term stability to precious metals, and is expected to be widely used in automotive emission control, fuel cells and chemical industries.