摘要
为了研究双金属氧化物在固体推进剂中的催化性能,采用溶剂热法及热退火工艺成功制备出在镍泡沫(NF)上生长的蜂窝状ZnCo2O4(honeycombs ZnCo2O4,ZnCo2O4(HCs)),并通过X射线粉末衍射(XRD),X射线光电子能谱仪(XPS),傅里叶红外光谱仪(FT-IR),扫描电子显微镜(SEM)及N2吸附-脱附测试对其物相组成和形貌结构进行了表征分析。采用差示扫描量热法(DSC)研究了制备的ZnCo2O4(HCs)对高氯酸铵(AP)和六硝基六氮杂异伍兹烷(CL-20)的催化性能。结果表明,当ZnCo2O4(HCs)用量为20%时,ZnCo2O4(HCs)/AP和ZnCo2O4(HCs)/CL-20最低热分解峰温,分别为575.01,521.55 K。与纯AP和CL-20相比,ZnCo2O4(HCs)/AP和ZnCo2O4(HCs)/CL-20复合物的放热分解峰温分别提前了101.87,3.73 K,热分析动力学计算表明它们的表观活化能分别降低了17.88,6.23 kJ·mol^-1。与文献报道的纳米微晶状(NCs)、纳米线状(NWs)及纳米球状(NSs)ZnCo2O4相比,蜂窝状ZnCo2O4呈现出良好的催化活性,这可归因于ZnCo2O4(HCs)的多孔结构和大比表面积,能够为热分解反应提供丰富的活性位点。
In order to study the catalytic performance of bimetallic oxides in solid propellants,the honeycombs ZnCo2O4(ZnCo2O4(HCs))particles grown on nickel foam(NF)were successfully prepared by solvothermal method and the subsequent thermal annealing process.Its phase composition and morphology structure were systematically characterized by X‐ray powder diffraction(XRD),X‐ray photoelectron spectroscopy(XPS),fourier transform infrared spectroscopic(FT‐IR),scanning electron microscopy(SEM)and N2 adsorption‐desorption test.The thermal behavior of ammonium perchlorate(AP)and hexanitrohexaazaisowurtzane(CL‐20)catalyzed by ZnCo2O4(HCs)were investigated by differential scanning calorimetry(DSC).Results showed that when 20%ZnCo2O4(HCs)is added,the thermal decomposition peak temperatures of ZnCo2O4(HCs)/AP and ZnCo2O4(HCs)/CL‐20 decreased most which were 575.01 K and 521.55 K,respectively.Compared with pure AP and CL‐20,the exothermic decomposition peak temperatures of ZnCo2O4(HCs)/AP and ZnCo2O4(HCs)/CL‐20 were decreased by 101.87 and 3.73 K and the apparent activation energies calculated by thermal analysis kinetics were reduced by 17.88 and 6.23 kJ·mol^-1.Furthermore,the as‐prepared ZnCo2O4(HCs)exhibited good catalytic activity comparing with ZnCo2O4 nanocrystallites(NCs),nanowires(NWs)and nanospheres(NSs).This can be attributed to the porous structure and large specific surface area of ZnCo2O4(HCs),which can provide rich active sites as a catalyst for the thermal decomposition reaction.
作者
李瑶瑶
张婷
李翠翠
王伟
庞爱民
郭兆琦
马海霞
LI Yao⁃yao;ZHANG Ting;LI Cui⁃cui;WANG Wei;PANG Ai⁃min;GUO Zhao⁃qi;MA Hai⁃xia(School of Chemical Engineering,Northwest University,Xi'an 710069,China;Hubei Institute of Aerospace Chemical Technology,Key Laboratory of Aerospace Chemical Power Technology,Xiangyang 441003,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2020年第6期544-551,共8页
Chinese Journal of Energetic Materials
基金
国家自然科学基金(21673179,21373161)
航天化学动力技术重点实验室基金项目(STACPL320181B03‐2)。
作者简介
李瑶瑶(1994-),硕士研究生,主要从事纳米含能材料。e-mail:287086750@qq.com;通信联系人:马海霞(1974-),教授,博士生导师,从事含能材料的合成、热力学性能及其量子化学研究。e-mail:mahx@nwu.edu.cn。
