Preparation of metal–organic framework-199 (Cu) and their effects on catalytic decomposition of hexahydro-1,3,5-trinitro-s-triazine

Abstract

In this study, a series of metal–organic framework-199 (MOF-199) products were prepared with copper (Cu) as the metal center and trimesic acid as the organic ligand. The morphological changes of MOF-199 under different preparation conditions and its application in the catalytic thermal decomposition of hexahydro-1,3,5-trinitro-s-triazine (RDX) were studied. The morphological changes of MOF-199 were compared by scanning electron microscopy (SEM), the crystal structures of MOF-199 were analyzed by X-ray diffraction and the effects of MOF-199 with different morphological characteristics on the thermal decomposition behavior of RDX were studied by differential scanning calorimetry. The results showed that MOF-199 with different morphologies could effectively adjust the thermal decomposition process of RDX and reduce the decomposition peak temperature of RDX, and the catalytic effect of MOF-199 was different due to different crystal surfaces exposed. Among them, (110) was a highly active crystal plane with a high catalytic activity. In addition to the crystal plane structure, the defects on the surface of MOF-199 would also affect its catalytic performance. This study provides some theoretical support for the catalytic mechanism of MOFs in the thermal decomposition of nitro compounds.