The iron catalyst supported on activated carbon was prepared by the impregnation method.N2physisorption, X-ray diffraction and H2 temperature programmed reduction were carried out to characterize the supports and iron catalyst.The ammonia synthesis was tested in a home-built continuous-flow reactor with methane and nitrogen as the feed gases.It was proved that NH3 ,ethene,ethane and some other substances were produced at 600 ～800℃ ,and methane conversion rate and ammonia production rate increased as raising temperature.At 700℃,methane conversion rate was 6.9 × 10 -7mol·g-1 ·s -1; ammonia production rate was 1.264 × 10 -8mol·g-1 ·s -1.The results also indicated that methane conversion and ammonia production rate were varied by ratios of CH4 and N2, the optimal ratio of them for ammonia synthesis was CH4:N2 = 9: 1 under the as-experimental conditions.%采用浸渍法制备了活性炭担载的Fe基催化剂.利用N2物理吸附、x射线粉末衍射、氢气程序升温还原等方法对载体和催化剂进行了表征.以甲烷和氮气为原料,在自制的常压连续流动式反应器中进行了直接合成氨实验.结果表明,在600～800℃之间有氨气产生,同时有乙烯、乙烷等物质生成,并且甲烷的转化速率和氨的生成速率随温度的升高而增大;在700℃时,甲烷的转化速率为6.9×10-7mol·g-1·s-1,氨的生成速率为1.264×10-8mol·g-1·s-1.甲烷的转化率以及氨生成速率随甲烷与氮气的摩尔比不同而不同.本实验条件下甲烷--氮气合成氨的合适摩尔比为CH4∶N2=9∶1.
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