In Situ Cutting of Ammonium Perchlorate Particles by Co‐Bipy “scalpel” for High Efficiency Thermal Decomposition

Abstract

Burning rate of solid propellants can be effectively improved by adding catalysts and using smaller size ammonium perchlorate (AP). Although few reports, the exploration of changing the size of AP primary particles by catalysts is of great significance for improving combustion performance. Here, taking Co-bipy as an example, the potential advantages of such materials as AP decomposition catalysts are reported. Due to the existence of NO 3 − combined with oxygen rich environment provided by AP, the structural self-transformation from micronrods to nanoparticles can be quickly realized during the heating process. More importantly, when Co-bipy decomposes, it can play the role of "scalpel" and in situ cut AP particles. Results show that high-temperature decomposition of Co-bipy/AP occurs at 305.8 °C, which is 137.5 °C lower than that of pure AP. Catalytic mechanism is discussed by in situ IR and TG-IR, CoO can effectively increase the content of reactive oxygen species and weaken the N-H bond, realizing the rapid oxidation of NH 3 . Eventually, the behavior of Co-bipy cutting AP particles is tested. This interesting catalyst structure self-transformation behavior can not only realize the influence on AP, but also perform a positive function in the combustion process of solid propellants, such as opening the adhesive AP interface.

Interaction Between Prussian Blue Ultrathin Nanosheet and Ammonium Perchlorate for Highly Efficient Thermal Decomposition

“…In contrast, the mass loss trend of PB-NSa-N 2 proves that its decomposition behavior has not stopped at 500 °C and further testify that in the presence of AP actual catalytic component is the final product Fe 2 O 3 , which is consistent with our previous research. [48,49] In addition, the TG test after mixing PB-NSa and AP with 1:1 mass ratio further confirms the above conclusion (Figure 4b). The rapid loss and gradual flattening of total mass near 300 °C indicated the rapid decomposition of AP and PB-NSa in this process.…”

Oriented Assembled Prussian Blue Analogue Framework for Confined Catalytic Decomposition of Ammonium Perchlorate

“…This kind of behavior seems to be proved in Figure 4b, and has also been reported in our previous work. [ 43 ]…”

The positive correlation between the dispersion and catalytic performance of Fe2O3 nanoparticles in nano-Fe2O3–ultrafine AP energetic composites supported by solid UV-vis spectroscopy

“…These results illustrate the need to explore new techniques to characterize the dispersion of nanocatalysts in composites. 41,42…”

“…These conclusions are consistent with the results of the difference equation, which confirms the accuracy and feasibility of the difference equation. 1,22–24,41–44…”

“…These results illustrate the need to explore new techniques to characterize the dispersion of nanocatalysts in composites. 41,42 The nano-Fe 2 O 3 -ultrafine AP composites were characterized by SEM. Only a little amount of nano-Fe 2 O 3 was observed on the surface of ultrafine AP obtained using stirring.…”