采用浸渍-还原法制备了铁、钴、镍、铜和锌催化剂,考察了其催化氨硼烷水解产氢性能,并优化了钴催化剂的制备条件和反应条件。结果发现,铁催化剂中铁以Fe₂B合金相存在,钴催化剂中钴以金属钴存在,镍催化剂中镍以金属镍和Ni（OH）₂·2H₂O存在,铜催化剂中铜以金属铜和氧化亚铜存在,锌催化剂中锌以Zn₄SO₄（OH）₆·4H₂O存在。铁、钴、镍、铜和锌催化剂催化氨硼烷水解产氢活性由大到小顺序为钴催化剂、镍催化剂、铜催化剂、铁催化剂、锌催化剂。显然,具有金属钴相的钴催化剂、金属镍相的镍催化剂和金属铜相的铜催化剂催化氨硼烷产氢活性高于具有Fe₂B合金相的铁催化剂。锌催化剂在制备条件下不能被还原为金属相,它几乎没有催化氨硼烷产氢活性。氯化钴与还原剂硼氢化钠的物质的量比为1∶1.3、还原温度为303 K时制备的钴催化剂催化BH₃NH₃水解产氢性能最佳。反应动力学计算表明钴催化剂催化BH₃NH₃水解产氢反应对氨硼烷浓度的反应级数为零级,对钴催化剂浓度的反应级数为一级,活化能为58 kJ/mol。

Fe,Co,Ni,Cu and Zn catalysts were synthesized with impregnation-reduction method,which were evaluated for the hydrogen generation via catalytic hydrolysis of BH₃NH₃.It was found that,Fe existed as Fe₂B in Fe catalysts;Co existed as metallic Co;Ni existed metallic Ni and Ni（OH）₂·2H₂O;Cu existed as metallic Cu and Cu₂O;Zn existed as Zn₄SO₄（OH）₆·4H₂O in their corresponding catalysts.In addition,the highest catalytic activity was obtained over Co catalyst,while the lowest cat-alytic activity was observed over Zn catalyst.The catalytic activity over Fe catalysts,Co catalysts,Ni catalysts,Cu catalysts and Zn catalysts was ranked in the order from big to small as Co catalysts,Ni catalysts,Cu catalysts,Fe catalysts and Zn cata-lysts.It was obvious that the catalytic activity over Co,Ni and Cu catalysts with their corresponding metallic state was superior to that obtained over Fe catalyst containing Fe₂B alloy phase.Furthermore,nearly no catalytic activity can be observed over Zn catalyst,since it cannot be reduced to metallic state under the preparation condition in this work.When CoCl₂ was reduced at 303 K using NaBH₄,the reducing agent with molar ratio as 1∶1.3,the highest catalytic activity towards hydrogen production can be achieved.According to the kinetic calculation,it was suggested that the hydrolysis of BH₃NH₃ towards hydrogen gener-ation over Co catalyst was a zero order and the first order reaction in corresponding to the concentration of BH₃NH₃ and amount of used Co catalyst,respectively.The activation energy was 58 kJ/mol.