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基于化学浸渍与原位化学还原相结合的方法制备了一系列CoB/棒状丝光沸石负载型非晶态合金催化剂,并系统考察了该催化剂在硼氢化钠水解制氢中的催化活性。通过X射线衍射和扫描电镜对其晶相结构和表面形貌进行了表征。硼氢化钠水解制氢实验表明,CoB活性组分负载量为5%的CoB/丝光沸石催化剂催化效果相对最好,过高的负载量不利于催化剂活性的提高。通过丝光沸石负载可显著提高CoB合金催化剂的催化活性,反应动力学计算显示基于该催化剂的硼氢化钠水解制氢反应为零级反应,其表观反应活化能Ea为53.18kJ/mol,远低于纯CoB的活化能(73.37kJ/mol)。
A series of CoB / rod mordenite-supported amorphous alloy catalysts were prepared based on the combination of chemical impregnation and in-situ chemical reduction. The catalytic activity of the catalyst in the hydrogenation of sodium borohydride was systematically investigated. Its crystal structure and surface morphology were characterized by X-ray diffraction and scanning electron microscopy. Hydrogenation experiments of sodium borohydride show that CoB / mordenite catalyst with 5% CoB active component has the best catalytic activity, and the higher loading is not conducive to the increase of catalyst activity. The catalytic activity of the CoB alloy catalyst can be significantly increased by the load of mordenite. The kinetic calculations show that the hydrogenation reaction of sodium borohydride based on the catalyst is zero-order reaction, and the apparent activation energy Ea is 53.18 kJ / mol, much lower The activation energy of pure CoB (73.37 kJ / mol).