| 摘要 |
A spherical cerium-activated catalyst for the NH3 synthesis is prepared by: mixing magnetite with (by weight): 2-3.5% of aluminum oxide, 0.8-2% potasium hydroxide, 2-3.5% calcium oxide, 0.1-0.4% magnesium oxide and 0.2-0.5% silica; melting this mixture in a furnace at a temperature of at least 1600 DEG C.; air-cooling the molten mass, removing melted slag; crushing the deslagged mass in a crusher and pulverizing it in a rod-mill; adding in a mixer to the so obtained powder a cerium nitrate solution in quantities to obtain in the final catalyst a metallic cerium concentration of 0.5 to 2.5%; pelletizing the so added powder in a tray pelletizer to obtain a sphere shaped catalyst; drying said catalytic spheres in a furnace 100 DEG -200 DEG C.,and sintering them in an argon atmosphere at a temperature of 1250 DEG -1350 DEG C. |
