Combustion Synthesis of La0.8Sr0.2MnO3 and Its Effect on HMX Thermal Decomposition

Abstract

Abstract: Perovskite-type La_0.8Sr_0.2MnO₃ was prepared by stearic acid gel combustion method.The obtained powders were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scaning electron micrograph(SEM)and X-ray photoelectron spectroscopy(XPS)techniques.The catalytic activity of La_0.8Sr_0.2MnO₃ was investigated on thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)by thermal gravity-differential scanning calorimetry(TG-DSC)techniques.The experimental results show that La_0.8Sr_0.2MnO₃ is an effective catalyst for HMX thermal decomposition.The surface-adsorbed species such as H₂O,OH^- and adsorbed oxygen(Oad)could result in an advance in the onset temperature of HMX thermal decomposition.The mixture system of Mn³⁺ and Mn⁴⁺ ions and lattice oxygen could play key roles for the increase of the decomposition heat of HMX because these exothermic reactions could be catalyzed by La_0.8Sr_0.2MnO₃ between CO and NO_x(from the thermal decomposition of HMX)and the oxidation reaction of CO.According to the previous researches and our results,perovskite-type La_0.8Sr_0.2MnO₃ may be used as a novel catalyst or modifier for nitrate ester plasticized polyether(NEPE)propellant.

Key words: stearic acid gel combustion synthesis, perovskite-type La_0.8Sr_0.2MnO₃, octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, thermal decomposition

摘要： Perovskite-type La_0.8Sr_0.2MnO₃ was prepared by stearic acid gel combustion method.The obtained powders were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scaning electron micrograph(SEM)and X-ray photoelectron spectroscopy(XPS)techniques.The catalytic activity of La_0.8Sr_0.2MnO₃ was investigated on thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)by thermal gravity-differential scanning calorimetry(TG-DSC)techniques.The experimental results show that La_0.8Sr_0.2MnO₃ is an effective catalyst for HMX thermal decomposition.The surface-adsorbed species such as H₂O,OH^- and adsorbed oxygen(Oad)could result in an advance in the onset temperature of HMX thermal decomposition.The mixture system of Mn³⁺ and Mn⁴⁺ ions and lattice oxygen could play key roles for the increase of the decomposition heat of HMX because these exothermic reactions could be catalyzed by La_0.8Sr_0.2MnO₃ between CO and NO_x(from the thermal decomposition of HMX)and the oxidation reaction of CO.According to the previous researches and our results,perovskite-type La_0.8Sr_0.2MnO₃ may be used as a novel catalyst or modifier for nitrate ester plasticized polyether(NEPE)propellant.

关键词: stearic acid gel combustion synthesis, perovskite-type La_0.8Sr_0.2MnO₃, octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, thermal decomposition

WANG Yan, GONG Lei, LI Yanbin, WEI Zhixian. Combustion Synthesis of La_0.8Sr_0.2MnO₃ and Its Effect on HMX Thermal Decomposition[J]. , 2010, 18(3): 397-401.

王艳, 龚磊, 李延斌, 卫芝贤. Combustion Synthesis of La_0.8Sr_0.2MnO₃ and Its Effect on HMX Thermal Decomposition[J]. CIESC Journal, 2010, 18(3): 397-401.

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Combustion Synthesis of La_0.8Sr_0.2MnO₃ and Its Effect on HMX Thermal Decomposition

Combustion Synthesis of La_0.8Sr_0.2MnO₃ and Its Effect on HMX Thermal Decomposition

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