Several transition
metal complexes of triaminoguanidine (TAG) nitrate, TAG-Ni, TAG-Co,
graphene oxide (GO)/TAG-Ni (GT-Ni), GO/TAG-Co (GT-Co), and GO/ TAG-Cu
(GT-Cu) were prepared using GO as a stabilizer.
It has been shown that these complexes are promising energetic catalysts
for decomposition of ammonium perchlorate (AP), which was uniformly
coated with the mentioned catalysts. The decomposition kinetic parameters
and mechanisms of the complexes have been studied by means of differential
scanning calorimetry/thermogravimetric techniques. Results show that
the presence of GO in such hybrid catalysts is able to stabilize AP
before its decomposition, but the strong catalytic effects occur on
HClO4 as the intermediate of the initial decomposition
of AP. In the cases of TAG-Co, GT-Co, and GT-Cu, they would make the
two-step decomposition of AP into a single step. The heat releases
have been greatly increased as well because of a more complete decomposition.
More importantly, the thermolysis mechanism of AP could be changed
by simply modifying the type of metal ions. Under the effect of these
catalysts, the decomposition more or less shifts to two-dimensional
growth of the nuclei model, which indicates that the metal ions played
key roles as active centers. The decomposition usually starts from
the surface of AP, where the contact of the catalysts further enhanced
the surface reactions. The inclusion of GO on the surface of the AP
crystal may hinder the evaporation of NH3, and therefore
the mechanism has been changed to the phase boundary-controlled reaction.
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