Investigating the Catalytic Effects of MOF-۱۹۹ on the ThermalDecomposition of Ammonium Dinitramide (ADN)

Understanding the decomposition behavior and combustion products of composite solidpropellants is of significant interest. Nowadays, ammonium perchlorate (AP) is extensively usedin composite solid propellants as an oxidizer [۱, ۲]. AP has the highest effective oxygen contentamong the oxidizers, i.e., its oxygen balance is up to +۳۴%. However, since AP contains Cl, thecombustion of AP-based propellants generates significant quantities of HCl as a reaction product[۳], which is a toxic gas and its emission is an environmental concern. Moreover, the HCl producesa large amount of smoke in the tail of the rocket [۴]. In order to overcome this problem, a newgreen oxidizer as a possible replacement for ammonium perchlorate (AP) has been investigated inrecent years. ADN is a metal-free energetic compound with the chemical formula of NH۴N(NO۲)۲and is composed of ammonium cation (NH۴+) and the dinitramide anion (N(NO۲)۲-), It has a highoxygen balance (+۲۵.۸%), which is used in military explosives and smokeless solid propellants orgreen propellants [۵]. In this work, the effect of MOF-۱۹۹ on the thermal decomposition behaviorof ADN was studied. Different compositions of ADN/MOF-۱۹۹, i.e. ۹۸:۲, ۹۵:۵, ۹۲.۵:۷.۵, and۹۰:۱۰%, were prepared by the solvent method and their thermal behavior has been studied by DSC.Accordingly, MOF-۱۹۹, in spite of its low weight, improves the thermal decomposition behaviorof ADN significantly. In addition, the rapid catalytic combustion of ADN/MOF-۱۹۹ (۹۰:۱۰) wasshown in a sharp exothermic peak. The results showed that MOF-۱۹۹ can be introduced as anexcellent catalyst for modifying the combustion of ADN, due to its porous structure,Lewis/Bronsted acid sites, and dispersed metallic sites

کلیدواژه ها:

Ammonium dinitramide ، Thermal Decomposition Behavior ، DecompositionTemperature ، Metal-Organic Frameworks ، MOF-۱۹۹