通过浸渍与化学还原相结合的方法制备了活性三氧化二铝负载Co B非晶态合金的负载型催化剂,并把该催化剂应用于硼氢化钠水解制氢反应。用SEM、XRD及BET等对三氧化二铝负载Co B非晶态合金催化剂的微观结构进行了系统表征,结果表明,非晶态...通过浸渍与化学还原相结合的方法制备了活性三氧化二铝负载Co B非晶态合金的负载型催化剂,并把该催化剂应用于硼氢化钠水解制氢反应。用SEM、XRD及BET等对三氧化二铝负载Co B非晶态合金催化剂的微观结构进行了系统表征,结果表明,非晶态合金Co B纳米颗粒能够均匀地分布于三氧化二铝表面,抑制了磁性纳米粒子Co B的团聚现象,显著提高活性组分Co B的分散度。产氢实验表明,具有高比表面积的负载型催化剂显著提高了硼氢化钠水解产氢速率,经计算硼氢化钠催化水解反应活化能约为55.21 k J/mol,明显低于基于非负载型Co B催化剂硼氢化钠催化水解反应的活化能(73.37 k J/mol)。同时随着温度、负载量及催化剂用量的增加,产氢速率也随之增加,25℃时水解反应的产氢速率约为1.03 m L/(min·mol)。展开更多
Amorphous Ni B/γ Al 2O 3 catalyst 1 is prepared with chemical reduction by KBH 4 solution after wetness impregnation and desiccation at 70 ℃ first and then at 110 ℃ for thorough water removal. Its higher catalytic ...Amorphous Ni B/γ Al 2O 3 catalyst 1 is prepared with chemical reduction by KBH 4 solution after wetness impregnation and desiccation at 70 ℃ first and then at 110 ℃ for thorough water removal. Its higher catalytic activity than amorphous Ni B/γ Al 2O 3 catalyst 2, prepared by conventional one step desiccation procedure at 110 ℃, is identified in liquid phase benzene hydrogenation to cyclohexane. Both catalysts are characterized by XRD and SEM, Ni B/γ Al 2O 3 catalyst 1 has a higher active specific surface area and dispersion degree, which can be assigned to more effective distribution of nickel salt over the support during desiccation, thus resulting in its superior activity in benzene hydrogenation.展开更多
文摘通过浸渍与化学还原相结合的方法制备了活性三氧化二铝负载Co B非晶态合金的负载型催化剂,并把该催化剂应用于硼氢化钠水解制氢反应。用SEM、XRD及BET等对三氧化二铝负载Co B非晶态合金催化剂的微观结构进行了系统表征,结果表明,非晶态合金Co B纳米颗粒能够均匀地分布于三氧化二铝表面,抑制了磁性纳米粒子Co B的团聚现象,显著提高活性组分Co B的分散度。产氢实验表明,具有高比表面积的负载型催化剂显著提高了硼氢化钠水解产氢速率,经计算硼氢化钠催化水解反应活化能约为55.21 k J/mol,明显低于基于非负载型Co B催化剂硼氢化钠催化水解反应的活化能(73.37 k J/mol)。同时随着温度、负载量及催化剂用量的增加,产氢速率也随之增加,25℃时水解反应的产氢速率约为1.03 m L/(min·mol)。
文摘Amorphous Ni B/γ Al 2O 3 catalyst 1 is prepared with chemical reduction by KBH 4 solution after wetness impregnation and desiccation at 70 ℃ first and then at 110 ℃ for thorough water removal. Its higher catalytic activity than amorphous Ni B/γ Al 2O 3 catalyst 2, prepared by conventional one step desiccation procedure at 110 ℃, is identified in liquid phase benzene hydrogenation to cyclohexane. Both catalysts are characterized by XRD and SEM, Ni B/γ Al 2O 3 catalyst 1 has a higher active specific surface area and dispersion degree, which can be assigned to more effective distribution of nickel salt over the support during desiccation, thus resulting in its superior activity in benzene hydrogenation.
