Effect of BiWO/g-CN composite on the combustion and catalytic decomposition of energetic materials: An efficient catalyst with g-CN carrier.

An effective strategy involving a suitable carrier is needed to improve the dispersion, combustion and catalytic performances of catalyst nanoparticles. Herein, a BiWO/g-CN composite employing g-CN as the catalyst carrier was prepared by a one-step in situ hydrothermal method, which was used as the combustion catalyst of solid propellants. The catalyst's structure, morphology and its catalytic decomposition on several energetic materials were characterized by a series of analyses. The optimal ratio of g-CN and BiWO was systematically determined. The results demonstrate that BiWO/g-CN (4:6) composite can diminish the decomposition temperatures of ammonium perchlorate (AP), cyclotrimethylenetrinitramine (RDX), dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) and cyclotrimethylenetrinitramine + nitrocellulose (RDX + NC) by 25.0, 5.2, 24.0 and 1.2 (4.9) ° C, and reduce their apparent activation energy by 59.5, 116.7, 11.6 kJ mol, respectively. Moreover, the laser ignition tests indicate that BiWO/g-CN can effectively promote the ignition performance of RDX and RDX + NC. A possible mechanism of BiWO/g-CN on AP was proposed. The g-CN catalyst carrier is superior to GO carrier due to its low cost, simple synthesis process, improved combustion and catalytic performances, as well as high N content. These make it have broad engineering application prospects in solid propulsion and other energetic materials.