Zhang Wenchao, Jiang Bin, Ma Xiaohang, Wang Jiaxin, Liu Jiaqi, Wu Runhui, Zheng Zilong, Liu Jingping, Ma Kefeng
School of Chemical Engineering, Nanjing University of Science and Technology Nanjing 210094 China.
The First Academy of China Aerospace Science and Technology Corporation Beijing 100048 China.
RSC Adv. 2019 Aug 5;9(41):23888-23893. doi: 10.1039/c9ra03865e. eCollection 2019 Jul 29.
The compatible catalytic structure of NiCoO was modified into multi-shelled hollow spheres by one-pot synthesis, followed by heat treatment. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer-Emmet-Teller (BET) and N adsorption-desorption approaches were used for the characterizations of nanoparticles and multi-shelled hollow porous structures and the morphologies and crystal structures of these hollow spheres, respectively. Differential scanning calorimetry (DSC) was adopted for comparing the thermal decomposition performances of ammonium perchlorate (AP) catalyzed by adding different contents of multi-shelled NiCoO hollow spheres. Impressively, the experimental results showed that the NiCoO hollow spheres exhibited more excellent catalytic activity than NiCoO nanoparticles as a result of their large specific surface areas, good adsorption capacity and many active reduction sites. The decomposition temperature of AP with multi-shelled NiCoO hollow spheres could be reduced up to 322.3 °C from 416.3 °C. Furthermore, a catalytic mechanism was proposed for the thermal decomposition of AP over multi-shelled NiCoO hollow spheres based on electron transfer processes.
通过一锅法合成并随后进行热处理，将具有相容性的NiCoO催化结构转变为多壳空心球。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）以及布鲁诺尔-埃米特-泰勒（BET）和N2吸附-脱附方法，分别对纳米颗粒和多壳空心多孔结构以及这些空心球的形态和晶体结构进行表征。采用差示扫描量热法（DSC）比较添加不同含量的多壳NiCoO空心球催化高氯酸铵（AP）的热分解性能。令人印象深刻的是，实验结果表明，由于其较大的比表面积、良好的吸附能力和众多活性还原位点，NiCoO空心球比NiCoO纳米颗粒表现出更优异的催化活性。添加多壳NiCoO空心球时，AP的分解温度可从416.3℃降低至322.3℃。此外，基于电子转移过程，提出了多壳NiCoO空心球上AP热分解的催化机理。
