| Physical and Chemical Properties | The BET surface area of the carrier is 565 m2/g, granular; It belongs to low-temperature and low-pressure ammonia synthesis catalyst, and its activity at normal pressure is 10-20 times higher than that of iron-based catalyst, saving energy and 25%. Under the conditions of 300 ℃ initial reaction temperature, 8.5MPa pressure and H2/N2 = 2.5, the ammonia synthesis rate can reach 20%. It has high toxicity resistance and is not sensitive to CO, CO2, H2O, etc, but it is very sensitive to oxygen; the estimated service life is 15 years. |
| Use | Used in the low temperature and low pressure ammonia synthesis process (KAAP) of the ammonia plant to catalyze the reaction of H2 and N2 to NH3. (industrialization in 1992). |
| production method | activated carbon is heated to 900 ℃ in N2 gas flow to remove aromatic hydrocarbons, then heated to 1500 ℃ in Ar gas flow, then cooled to 425 ℃ and oxidized by air. After the weight loss reaches 23%, the Ar gas is switched, and then the temperature is raised to 1700 ℃ to form a graphite-containing carbon carrier. The carrier is impregnated with rubidium nitrate (RbNO3) aqueous solution, dried and impregnated with RuCl3 aqueous solution, and the finished product is obtained after drying. Ruthenium compounds can also be used Ru3(CO)12, sublimated to the above-prepared rubidium nitrate treated carrier, and then decomposed and dried in a vacuum to obtain the finished product. |