Advanced Materials Research Vols. 1008-1009

Abstract: The catalytic effects of Zn on the yield of the gaseous products during steam gasification of lignite char were investigated by using a fixed-bed reactor. The gas composition was measured using a gas chromatography (GC). The experimental results show that Zn has catalytic effects on steam gasification and increased the yield of H_2. There was an optimum content of Zn implanted into the coal above which zinc does not show further catalytic activity.

Abstract: There is a wide variety of coalbed gas fracturing fluids. It’s important that choose suitable fracturing fluids for different kinds of formations. We summed up the advantages and disadvantages of each type of fracturing fluid by analyzing and comparing different types of fracturing fluid, and produced a performance comparison table between each type. Pointed out that the existing problems and solutions of fracturing fluid in coalbed and envisaged the future trends.

Abstract: Fuel cells are together used with solar cells and lithium cells in the propulsion system of hybrid UAVs. According to the result of fuel cell’s performance experiment and based on the radial basis function interpolation, a fuel cell system performance prediction model is established. Moreover, the analysis on the model’s result shows a good accuracy of the method and also a good applicability for the preliminary design of hybrid UAVs.

Abstract: The pyrolysis of low rank coal (LRC) , enteromorpha (EN) and their mixture were carried out in a special prolysis equipment. The experiments showed that the maximum tar yield of blends was 11.39% with a EN ration of 30%, which increased by 28.61% compared to LRC pyrolysis alone and 8.87% compared to calculated value. The thermogravimetric analysis (TGA) of LRC, EN and their mixture indicated that there was significant synergistic effect in the co-pyrolysis process of LRC and EN during 240~750°C. The relative maximum value of synergistic effect was 18.5%. Kinetics analysis showed there was compensation effect between activation energy and pre-exponential factor of co-pyrolysis. The mix of LRC and EN enhanced the reaction activity and lowers the reaction rate. Synergistic effect mainly was reflected in enhancing the reaction activity of co-pyrolysis.

Abstract: Two kinds of import laptop battery and one kind of domestic laptop battery were investigated in the temperature cycling test. The results showed that all the samples didn’t fire, explosion and leakage in the temperature cycling tests. But the shell glue of domestic laptop battery was disabled more serious then that of import laptop battery and it still exist some security risk.Therefore, There is a long way to go to investigate and improve the quality and safety performance of some laptop battery.

Abstract: The combustion characteristics of corn stalk and low volatile coal were carried out through the thermogravimetric experiments.The heating rates is 40°C/min.We used the Q50.It is found that the combustion processes of corn stalk and the low volatile coal combustion include moisture evaporation,volatile evolution and combustion,char combustion three stages.The main stage of corn stalk is volatile evolution and combustion and the main stage of low volatile coal is char combustion.Compare the TG and DTG curves of the corn stalk and the low volatile coal combustion we find the corn stalk is easy to be ignited and fires quickly at the atmosphere of pure oxygen.The corn stalk weightlessness mainly happens between 120~300°C,the biggest weight loss rate is 252%/min while the low volatile’s is 56%/min.The firing effect of corn stalk is better than the low volatile’s.

Abstract: Niuxintuo reservoir is a low permeability fractured reservoir with high pour point oil reservoir.control agent formula obtained via laboratory test can effectively improve iulection profile, which can be evaluated by performance of salt tolerance, Core plugging experiments shows that this profile control agent has achieved a success rate of 97%,the purpose of blocking high permeability formation is achieved.

Abstract: Double-chambered microbial fuel cells (MFCs) were used to investigate the effect of sulfate and sulfate-reducing bacteria (SRB) on electricity generation by molybdate inhibition coupled with PCR-DGGE technique. Results showed that low influent sulfate (< 1470 mg/L) improved power density and voltage, while higher sulfate blocked the MFC efficiency. Molybdate inhibited the activity of SRB and consequently decreased MFC voltage and power density which confirmed some SRB were involved in the electricity generation. Microbial community analysis indicated that Desulfovibrio desulfuricans contributed to the electricity production and stability of MFC.

Abstract: Mesoporous ZrO₂ with narrow mesopore size distributions has been prepared by the surfactant-assisted method of nanoparticle assembly. A series of VCrO/ZrO₂ catalysts with different V/Cr molar ratio (0.3, 0.6, 1.0, 1.3 and 1.6) were prepared by the wetness impregnation method and characterized by XRD, N₂ adsorption and TEM techniques. N₂ adsorption and TEM analysis revealed that the surfactant-assisted method prepared VCrO/ZrO₂ catalysts have wormhole-like mesoporous structure with uniform pore size distribution. VCrO/ZrO₂ catalysts have been applied for direct dehydrogenation of propane to propene. The optimistic catalyst was V/Cr-0.6 with highest yield of 41.7% the corresponding conversion of propane was 44.1% and selectivity to propene was 94.5% at 550 °C.

Abstract: Fixed bed reactor was used to explore the catalytic performance of ZSM-5 catalysts with the forms of flake and strip in methanol to gasoline (MTG) reaction. The catalyst samples were characterized by XRD, BET and SEM. The strip ZSM-5 catalyst was modified by 0.4 Molar NaOH solution, which was denoted by TZSM-5/AT. The results show that ZSM-5 molecular sieves could be effectively dispersed to prevent carbon accumulation when extruded with binder. So the coke deposition resistance capacity of strip ZSM-5 has significantly enhancement comparing with flake ZSM-5. Mesoporous structure in strip zeolites formed after NaOH treatment, which could prevent coke formation and further improve catalyst life. The conversion of methanol remains above 80% over 140 hours on alkali-modified strip ZSM-5 operating at atmospheric pressure, 380°C and weight hourly space velocities (WHSV) of 1.5 h^-1.