Papers by Author: Hou He Chen

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Authors: Yao Xuan Zhang, Lu Yao Zhang, Qiu Jie Zhang, Hou He Chen
Abstract: The main factors affecting the drying process of RDX and the optimum drying conditions were investigated through single factor test and response surface methodology, the optimal drying conditions were gained. The results show that moisture content, vacuum, temperature are important factors in the drying process of RDX, the significance of main influencing factors is: temperature> vacuum> moisture content, the suggested drying condition is: 80°C for temperature, 0.05MPa for vacuum, 10% for moisture content.
Authors: Ai Jun Han, Li Ya Zhang, Ming Quan Ye, Dong Sheng Hu, Hou He Chen
Abstract: Nanocrystalline CoxZn1-xCr2O4 (x=0.7, 0.8, 0.9, 0.95, and 1) was synthesized by the low-temperature combustion synthesis method using citric acid as reductant and metal nitrates as oxidants. XRD, TEM, FT-IR and DSC were employed to characterize the structure, morphology, infrared curve and the catalytic performance for the ammonium perchlorate (AP) decomposition of the sample, respectively. Results show that cubic spinel-type solid solution of 30 nm CoxZn1-xCr2O4 particles can be obtained at 800 °C. The absorption bands in IR curve at 528 cm-1 and 627 cm-1 corresponding to the vibration of octahedron group [CrO6], the peaks slightly shift to high wave number with the increase of the x value. Compared with the thermal decomposition of pure AP, adding CoxZn1-xCr2O4 nanoparticles in AP decreases its decomposition temperature by 58~68 °C and increases its apparent decomposition heat to 1049.62~740.13 J/g, exhibiting significant catalytic effect. Catalytic mechanism is due to the lattice of transition metal ions Co2 + and Cr3 + in the outer d orbital electron transfer, which provides a good space and produces complex with NH3 ligands of ammonium perchlorate’s dissociation products.
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