Cu–Cr–Pb nanocomposites

Abstract

In this study, we present the synthesis of CuCr-Pb nanocomposites by a simple co-precipitation method and evaluate the catalytic performance of the asfabricated Cu-Cr-Pb nanocomposites on the thermal decomposition of ammonium perchlorate (AP). The X-ray diffraction, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis/differential scanning calorimetric techniques were employed to characterize the crystal phases, sizes and catalytic properties of as-obtained Cu-Cr-Pb nanocomposites, respectively. The results revealed that dropping Pb in CuCr 2 O 4 could form Cu-Cr-Pb nanocomposites. The structure, size and catalytic property of the as-synthesized Cu-Cr-Pb nanocomposites are closely relevant to the Cu/Pb molar ratio in the starting reactants. Noticeably, when Cu-Cr-Pb nanocomposites were synthesized under the condition of the molar ratio of Cu/Pb = 4:1, the dispersion is better, the size distribution is narrower, and the catalytic performance for AP is more effective than those of the particles obtained by other Cu/Pb molar ratios, which may lead to potential applications of Cu-Cr-Pb nanocomposites in AP-based solid propellants in future.

Preparation of a Chitosan-Lead Composite Carbon Aerogel and Its Catalytic Thermal Decomposition Performance on Ammonium Perchlorate

“…The lead salt, as the active catalyst in the solid propulsion system, has a positive impact on the combustion rate and performance of the propellant. 13,14 Huo et al introduced a poly(lead acrylate) (PAA-Pb) porous metal material into the AP catalytic system, and the high-temperature decomposition peak of AP was reduced by 73.7 K. 15 The pyrolysis peak of AP was advanced by 95 K when the amount of the complex added was 10 wt %. 12 Cheng et al reported Pb-ANP y O/CNTs nanocomposites, which can reduce the pyrolysis peak of AP by nearly 100 K. 9 However, metallic elements have great limitations because of their high surface energy and tend to lead to agglomeration so that their catalytic activity is low, which has a great impact on the catalytic effect of AP thermal decomposition.…”

“…In recent decades, catalysts applied in the field of catalytic AP have been extensively studied, such as metal oxides, metal particles, metal-based composites, and carbon nanomaterials. ,− In this article, Pb­(II) is chosen as the catalyst on the basis of the following considerations: lead metal has a good coordination ability and can easily chelate with multifunctional groups to form salts. The lead salt, as the active catalyst in the solid propulsion system, has a positive impact on the combustion rate and performance of the propellant. , Huo et al introduced a poly­(lead acrylate) (PAA-Pb) porous metal material into the AP catalytic system, and the high-temperature decomposition peak of AP was reduced by 73.7 K . The pyrolysis peak of AP was advanced by 95 K when the amount of the complex added was 10 wt % .…”