以Ni （NO₃）₂·6H₂O、Al （NO₃）₃·9H₂O和Na₂CO₃为原料，采用共沉淀法制备了不同摩尔比的Ni/Al₂O₃催化剂。并用单点BET、XRD、TPR、TPSR以及化学吸附方法对催化剂的结构及氨分解反应的催化活性进行表征。结果表明，与Al₂O₃载体复合的NiO材料的催化活性明显高于纯NiO的催化活性。镍的摩尔分数为20%相对应的NiAl催化剂的Ni的分散度最大并且催化活性最高。当9.7% NH₃/He混合气流速控制在10 mL/min且反应温度为600℃时，该材料的氨转化率为96.1%。

A series of Ni/Al₂O₃ catalysts with different molar ratios are prepared by co-precipitation method using Ni(NO₃)₂·6H₂O,Al(NO₃)₃·9H₂O and Na₂CO₃ as raw materials.Single-point BET,XRD,TPR,TPSR and H₂-chemisorption are used to characterize the structure of the prepared catalyst and its catalytic activity in ammonia decomposition.The results indicate that the catalytic activity of the NiO material composited with Al₂O₃ supporter is significantly higher than that of pure NiO catalysts.The catalyst containing 20% of nickel in molar has the largest dispersion of Ni and the highest catalytic activity and the ammonia conversion rate over this catalyst can reach 96.1% when the flow rate of 9.7% NH₃/He mixture gas is controlled at 10 mL·min^-1 and the reaction temperature is set at 600℃.