自牺牲模板法制备多孔MnCo2O4.5及其对高氯酸铵热分解的催化性能

Self-sacrificial Template-directed Synthesis of Porous MnCo2O4.5 and Their Catalytic Performance for Thermal Decomposition o

摘要:

采用自牺牲模板法制得了多孔MnCo2O4.5。即以硫酸钴和硫酸锰为原料，草酸为沉淀剂，通过水热技术预先合成出板块状草酸盐前驱体，继而将前驱体进行焙烧以脱除CO2和H2O，从而原位得到良好保持板块状形貌的多孔MnCo2O4.5。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和N2吸附-脱附等对样品的物相、形貌及孔结构进行了表征。借助差示扫描量热(DSC)技术评价了多孔MnCo2O4.5对AP的热分解催化性能。结果表明，多孔MnCo2O4.5对AP热分解过程具有良好的催化活性，添加2%(w)的MnCo2O4.5可使AP的高温分解峰值温度降低128℃，表观分解热提高557 J/g。

Abstract:

Porous MnCo2O4.5 was prepared by the self-sacrificial template method. That is, the precursor with a plate-like morphology was firstly synthesized via a hydrothermal method, using MnSO4 and CoSO4 as raw materials and H2C2O4 as precipitator, respectively. Then porous MnCo2O4.5 well preserved the plate-like morphology, was in situ obtained by calcining the precursor. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and N2 adsorption-desorption were used to characterize the phases, morphologies and pore structures of the samples. Differential scanning calorimetry (DSC) was employed to evaluate the catalytic performance of these porous MnCo2O4.5 microsplates for thermal decomposition of ammonium perchlorate (AP). The result shows that the as-obtained porous MnCo2O4.5 exhibites excellent catalytic performance. Adding 2% (wt) porous MnCo2O4.5 into AP decreases the high-temperature exothermic peak by 128 癈 and the apparent decomposition heat increases by 557 J/g, respectively.