In situ synthesis NiO@TiO2/MXene as a promoter for ammonium perchlorate based solid propellants
APPLIED SURFACE SCIENCE(2024)
摘要
The carrier can widely affect or even dominate the catalytic activity and selectivity of nanoparticles for ammonium perchlorate (AP). In this work, a novel catalyst NiO@TiO2/MXene (TN) nanocomposite was prepared by a simple hydrothermal method using two-dimensional MXene as the catalyst carrier. System characterization reveals that the utilization of MXene supports facilitates effective dispersion of NiO nanoparticles. TiO2/MXene itself exhibits commendable catalytic activity and possesses a substantial specific surface area, thereby enabling regulation of the catalytic performance of NiO. TN surpasses both NiO and TiO2/MXene in promoting the high temperature decomposition (HTD) of AP. By increasing the concentration of Ni2+ in the precursor, the loading capacity of NiO on the carrier is enhanced, consequently improving its catalytic capability towards AP. As the load of NiO increases, there is a decrease in high decomposition temperature (THTD) from 437.3 degrees C to 313.3 degrees C, a reduction in activation energy (Ea) from 216.1kJ/mol to 114.6 kJ/mol, and an increase in heat release by 118 %. NH3-TPD and O2-TPD studies have shown that catalysts with strong surface adsorption capacity for NH3 and O2 exhibit excellent catalytic performance, leading to differences in their catalytic behavior. TG/FT-IR analysis further confirms that TN nanocomposites accelerate N2O conversion to NO, which contributes to rapid AP decomposition.
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关键词
Ammonium perchlorate,NiO@TiO2/MXene,Catalytic performance
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