1, high catalytic activity and selectivity and long service life. Rhodium and its alloys, rhodium-containing compounds and complex catalysts can be used in the production of aldehydes and acetic acid, purification of automobile exhaust, ammonia oxidation in nitric acid production, organic chemical synthesis of plastics, artificial fibers, drugs and pesticides, and electrodes of fuel cells.
2. The reflectivity of visible light is high and stable. It is usually used to coat reflective surfaces, such as special industrial mirrors, searchlights and radars.
3. It is one of the most stable metals with high melting point, oxidation resistance and corrosion resistance. It can be used as a corrosion-resistant container in the atmosphere at the high temperature of 1850℃, and the pure rhodium crucible can be used to produce calcium tungstate and lithium niobate single crystals.
4. Rhodium coating has high hardness (7500 ~ 9000 MPa), wear resistance, corrosion resistance and stable contact resistance. Rhodium-plated composite material is an excellent electrical contact material, and rhodium can also be used for plating ornaments, other industrial instruments and gas sensors.
5. modify. Rhodium can form solid solution with platinum, palladium and other metals, which can strengthen the matrix, improve the melting point, recrystallization temperature and corrosion resistance of the matrix, and reduce the loss of oxidation and volatilization. Platinum-rhodium alloy is an excellent temperature measuring material for precious metals. Adding rhodium to iridium can improve the processability of iridium.
Extended data:
Rhodium has a higher melting point and a lower density than platinum. Rhodium is insoluble in most acids. It is completely insoluble in nitric acid and slightly soluble in aqua regia. It comes from rhodon, which means "rose", because the solution of rhodium salt is rose red, which was discovered and isolated by Wollaston in 1803.
Rhodium is a platinum group metal with high melting point, high strength, stable electrothermal performance, high spark corrosion resistance, excellent corrosion resistance, strong high-temperature oxidation resistance and good catalytic activity. Rhodium is widely used in automobile exhaust purification, chemical industry, aerospace, glass fiber, electronic and electrical industries and so on. Although the dosage is small, it plays a key role and is known as "industrial vitamin".
Baidu encyclopedia-rhodium