Guo Yu, Zhao Ningning, Zhang Ting, Gong Hujun, Ma Haixia, An Ting, Zhao Fengqi, Hu Rongzu
School of Chemical Engineering, Northwest University Shaanxi Xi'an 710069 P. R. China
State Key Laboratory of Continental Dynamics, Northwest University Shaanxi Xi'an 710069 P. R. China.
RSC Adv. 2019 Jan 29;9(7):3927-3937. doi: 10.1039/c8ra09632e. eCollection 2019 Jan 25.
Nano metal oxides are common combustion catalysts for enhancing the burning rate of solid propellants. CrO nanoparticles (NPs) are efficient combustion catalysts for the pyrolysis of energetic components. In this study, CrO NPs were synthesized a modified sol-gel method and further used for studying the thermal decomposition of nitrocellulose (NC). Differential scanning calorimetry (DSC) and thermogravimetry-Fourier-transform infrared spectroscopy (TG-FTIR) analyses indicate that the CrO NPs can be safely used with NC and the mechanism of the reaction between CrO/NC and pure NC follows the Avrami-Erofeev equation: () = 3(1 - )[-ln(1 - )]/2. The peak temperature and activation energy ( ) for the thermal decomposition of CrO/NC are lower than those of pure NC. NO was detected at a lower temperature after NC was mixed with CrO NPs; this indicated the catalytically accelerated bond cleavage of NC by CrO NPs.
纳米金属氧化物是用于提高固体推进剂燃烧速率的常见燃烧催化剂。CrO纳米颗粒（NPs）是用于含能组分热解的高效燃烧催化剂。在本研究中，采用改进的溶胶-凝胶法合成了CrO NPs，并进一步用于研究硝化纤维素（NC）的热分解。差示扫描量热法（DSC）和热重-傅里叶变换红外光谱法（TG-FTIR）分析表明，CrO NPs可与NC安全使用，且CrO/NC与纯NC之间的反应机理遵循Avrami-Erofeev方程：() = 3(1 - )[-ln(1 - )]/2。CrO/NC热分解的峰值温度和活化能（）低于纯NC。NC与CrO NPs混合后，在较低温度下检测到NO；这表明CrO NPs催化加速了NC的键断裂。
