中文摘要：

利用等体积浸渍法制备了Fe-Co、Fe-Ni、Mo-Co、Mo-Ni双金属催化剂（总金属含量均为10%（w，质量分数），双金属摩尔比均为1：1），考察了其在等离子体条件下氨分解活性，结果表明Fe-Ni双金属催化剂表现出较好的协同作用。在此基础上，进一步考察了Fe/Ni摩尔比对其活性的影响。结果表明：当Fe/Ni摩尔比为6/4时，氨分解活性最好，而且该双金属催化剂稳定性良好。采用N2物理吸附、X射线衍射（XRD）、H2-程序升温还原（H2-TPR）和高分辨透射电子显微镜（HRTEM）对催化剂的物化性质、还原性能、微观形貌等进行了研究。结果表明：活性较好的Fe-Ni双金属催化剂中，Fe与Ni形成尖晶石结构NiFe2O4，该结构有利于Fe和Ni的还原，即活性组分易恢复金属态，这可能是其活性较高的原因。

英文摘要：

Bimetallic Fe-Co, Fe-Ni, Mo-Co, and Mo-Ni catalysts, with total metal contents of 10 wt% and bimetallic molar ratios of 1：1, were prepared by the incipient wetness impregnation method and their activities for ammonia decomposition in the presence of plasma were studied. The Fe-Ni bimetallic catalyst exhibited a better synergistic effect than the other three bimetallic catalysts. The effect of the Fe/Ni molar ratio on its catalytic activity was also investigated. A 6：4 Fe/Ni molar ratio resulted in the highest ammonia decomposition activity and stability. The catalysts were characterized by N2 adsorption- desorption, XRD, H2-TPR, and HRTEM. The characterization results indicated that NiFe204 with a spinel structure was formed in the optimal Fe-Ni bimetallic catalysts and this structure favors the reduction of Fe and Ni. In other words, it is easy to achieve the metallic state of active components for the Fe-Ni bimetallic catalysts, which could be the reason for the high catalytic activity of bimetallic catalysts for NH3 decomposition.