Papers by Author: Jun Zhou

Abstract: Microwave pyrolysis of low rank coal is a new technology of cleaner production. The effect of microwave power and flow rate of N₂ on the yield of pyrolysis products under N₂ atmosphere was explored. The results showed that the higher microwave power was, the higher all the terminal temperature, the yield of liquid products and the weight loss rate were. The flow rate of N₂ had little influence on the yield of pyrolysis solid products, while it exerted a greater influence on the yield of pyrolysis liquid products. When the low rank coal was pyrolysised under the conditions of microwave power of 800W and flow rate of N₂ of 4.0×10^-4 m³/min, the yield of Bluecoke and liquid products respectively reached 65.8% and 18%.

Abstract: According to the components of bluecoke furnace gas by rich oxygen carbonization, the methane conversion and methanol synthesis processes with simulation mix gas were separately researched using the self-made catalysts. The results show that the conversion rate of methane could achieve about 95% under the conditions of temperature of 800°C, space velocity of 9000h^-1 and the ratio of water to hydrocarbon of about 3.0 with self-made Ni/γ-Al₂O₃ catalyst. For synthesis of methanol with self-made CuO-ZnO-Al₂O₃ catalyst in fixed reactor from the reformed gas, the space time yield and selectivity of coarse methanol respectively reached 1.5451g•g^-1•h_-1 and 99.6143% under the conditions of temperature of 240°C, pressure of 5.5MPa and space velocity of 12000h^-1.

Abstract: An effective technology of hydrothermal synthesizing flower-sphere MoS₂ by reaction of Na₂MoO₄ and CS(NH₂)₂ with NH₂OH•HCl as reductant was researched. The effect of the molar ratio of Mo to S, reaction temperature, reaction time, aging time on the yield, purity and morphology of the product was explored by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the optimal synthesis conditions are as follows: the molar ratio of Mo to S of 1:7, the temperature of 220°C, the reaction time of 24h and the aging time of 16h. Under these conditions, the inerratic and pure flower-sphere MoS₂ was obtained. Its average particle size is about 2μm and the petal is self-assembly growth. The yield of the product can reach 88%.

Abstract: The pyrolysis characteristics of Jianfanggou(JFG) coal was studied using a thermo-gravimetric analyzer and the pyrolysis kinetic parameters were calculated at the different heating rate. The results showed the DTG curves under different heating rate had three peaks and the corresponding temperature were 100°C, 470°C and 750°C, the pyrolysis process can be divided into three stages conclusively. The maximum weight loss rate at 470°C indicated the major weight loss occurred in the second stage. The T_b, T_f and T_∞ obtained under experiment situation. The results of the JFG coal pyrolysis kinetic showed the T_b, T_f and T_∞ increased gradually with the accretion of the heating rate. In the meantime, the variation of frequency factor was consistent with the trend of activation energy.

Abstract: The flower-sphere molybdenum disulfide has been synthesized by reaction of Na₂MoO₄ and CS(NH₂)₂ with NH₂OH·HCl or H₂C₂O₄ as reductant. The microstructure and chemical composition of the product were characterized by means of X-ray diffraction and scanning electron microscope. XRD patterns showed that the molar ratio of Mo to S had a great effect on the purity of the product. When the molar ratio of Mo to S was 1:5, the product was nearly pure MoS₂. SEM images showed that the particle size increased as the molar ratio of Mo to S reduced. The MoS₂ microspheres had rough surfaces and were constructed with sheet-like structures in the two systems. But the product from the system of NH₂OH·HCl as reductant has the bigger particle size, clearer petal-sheets, coarser surface and weaker agglomeration than that from the system H₂C₂O₄ as reductant. The possible chemical reactions in hydrothermal systems were preliminarily discussed.