Structural design and evolution of one-dimensional Cu hydrogen-bonded organic framework for catalyzing the rapid decomposition of ammonium perchlorate.

Enhancing the decomposition rate of ammonium perchlorate (AP), the most common oxidizer in solid propellants, is important for improving propellant performance. Metal organic frameworks (MOFs) have been developed as key materials for catalyzing AP decomposition, as they can achieve good dispersion of active sites through in-situ decomposition. Despite having considerable potential, the structural transformation process and catalytic performance of MOFs in AP decomposition are still unclear, which seriously hinders their application in the field of AP decomposition. Based on this, we propose a strategy to use a one-dimensional hydrogen-bonded organic framework (HOF) as a base to construct Cu complexes on the surface through coordination interactions to form heterostructure, which in turn yields a Cu-coordinated hydrogen-bonded organic framework(Cu-HOF) as a catalytic material. The good catalytic decarboxylation ability of Cu endows the material with a thermal instability that enables it to decompose rapidly and in situ during the catalytic process, leading to the exposed dispersive behavior of the active sites and the efficient catalysis. The experimental results showed that the decomposition rate of AP was dramatically increased by the addition of Cu-HOF, and the peak value of DTG was enhanced by 17.46 times, demonstrating the effectiveness of the design strategy.