采用水热法制备了四氧化三钴@碳化蝶翅(Co_3O_4@CW)纳米复合材料。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、比表面及孔径分析仪表征了其结构和成分。采用同步热分析仪(DSC-TG)研究了该复合材料对高...采用水热法制备了四氧化三钴@碳化蝶翅(Co_3O_4@CW)纳米复合材料。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、比表面及孔径分析仪表征了其结构和成分。采用同步热分析仪(DSC-TG)研究了该复合材料对高氯酸铵(AP)热分解的催化性能。结果表明,Co_3O_4@CW具有微孔-介孔-大孔的多级孔结构,Co_3O_4纳米粒子均匀紧密地负载于碳化蝶翅的骨架上,其中Co_3O_4的负载量约为72.0%。Co_3O_4@CW可显著降低AP的高温分解峰温度,当Co_3O_4@CW的添加量为3%时,AP的高温分解峰提前147℃,AP的热分解放热量从173.4 k J·mol^(-1)增加到369.3 k J·mol^(-1),表现出了良好的催化性能。展开更多
A series of NixCo1-xCo2O4(0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by the...A series of NixCo1-xCo2O4(0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by thermal analysis. The catalysts were calcined at 500 °C for 3 h and characterized by powder X-ray diffraction, Fourier transform infrared, and N2 adsorption-desorption. Nickel cobaltite spinel was formed in the solid state reaction between NiO and Co3O4. The N2O decomposition measurement revealed significant increase in the activity of Co3O4 spinel oxide catalyst with the partial replacement of Co2+ by Ni2+. The activity of this series of catalysts was controlled by the degree of Co2+ substitution by Ni2+, spinel crystallite size, catalyst surface area, presence of residual K+, and calcination temperature.展开更多
文摘采用水热法制备了四氧化三钴@碳化蝶翅(Co_3O_4@CW)纳米复合材料。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、比表面及孔径分析仪表征了其结构和成分。采用同步热分析仪(DSC-TG)研究了该复合材料对高氯酸铵(AP)热分解的催化性能。结果表明,Co_3O_4@CW具有微孔-介孔-大孔的多级孔结构,Co_3O_4纳米粒子均匀紧密地负载于碳化蝶翅的骨架上,其中Co_3O_4的负载量约为72.0%。Co_3O_4@CW可显著降低AP的高温分解峰温度,当Co_3O_4@CW的添加量为3%时,AP的高温分解峰提前147℃,AP的热分解放热量从173.4 k J·mol^(-1)增加到369.3 k J·mol^(-1),表现出了良好的催化性能。
文摘A series of NixCo1-xCo2O4(0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by thermal analysis. The catalysts were calcined at 500 °C for 3 h and characterized by powder X-ray diffraction, Fourier transform infrared, and N2 adsorption-desorption. Nickel cobaltite spinel was formed in the solid state reaction between NiO and Co3O4. The N2O decomposition measurement revealed significant increase in the activity of Co3O4 spinel oxide catalyst with the partial replacement of Co2+ by Ni2+. The activity of this series of catalysts was controlled by the degree of Co2+ substitution by Ni2+, spinel crystallite size, catalyst surface area, presence of residual K+, and calcination temperature.
