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Yizhou, China

Zhang L.,Guangxi University | Huang H.,Hechi College | Tong Z.,Guangxi University
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology

The fiber felty V2O5/TiO2/carbon catalyst was prepared by supporting V2O5 on TiO2 film coated with activated carbon fiber felt (ACF) under ultrasonic irradiation and was characterized by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of V2O5 and TiO2 loading on selective catalytic reduction (SCR) of NO were investigated. The results showed that compared with powdered V2O5/TiO2, fiber felty V2O5/TiO2/carbon-based catalyst exhibited better low temperature activity due to ACF skeleton, and TiO2 loading had no significant effect on SCR activity while SCR activity increased with the increase of V2O5 loading. Conversion of NO reached 84.26% under the conditions of TiO2 loaded 2%, V2O5 loaded 9%, reaction temperature 280 °C and gas hourly space velocity 5 000 h-1. Source

Feng C.,Guangxi Normal University | Lin Y.,Hechi College
Applied Mechanics and Materials

In this paper, we discuss a system of four coupled oscillators with delays. Some sufficient conditions to guarantee the existence of oscillations for the model are obtained. Computer simulations are provided to demonstrate the present results. © (2011) Trans Tech Publications, Switzerland. Source

Li X.-H.,Guangxi University | Zhang Y.-J.,Guangxi University | Qin Q.-L.,Guangxi University | Yang J.,Guangxi University | Wei Y.-S.,Hechi College
Transactions of Nonferrous Metals Society of China (English Edition)

Indium was recovered from zinc oxide flue dust (ZOFD) with sulfuric acid by oxidative pressure leaching in an autoclave, and the effects of different technological conditions on indium leaching were studied. Potassium permanganate and hydrogen peroxide were used as oxidants. The atmospheric pressure leaching experiments were also carried out. The experimental results show that the leaching rate of indium can be effectively improved by oxidative pressure leaching. The optimum conditions of pressure leaching are determined as sulfuric 5.10 mol/L acid, leaching time 150 min, temperature 90 °C, and the H 2O2 dosage of 0.5 mL/g or 2.5% KMnO4. The leaching rate of indium is more than 90%, which is increased by 13% compared with that of atmospheric pressure leaching process without oxidant under the optimum conditions. Source

Lin Y.,Hechi College | Feng C.,Guangxi Normal University
Communications in Computer and Information Science

In this paper, a system of three coupled oscillators with delays is investigated. Some sufficient conditions to guarantee the existence of stability and oscillations for the model are obtained. Simulations are provided to demonstrate the proposed results. © 2011 Springer-Verlag. Source

Zhang Y.-J.,Guangxi University | Li X.-H.,Guangxi University | Pan L.-P.,Guangxi University | Wei Y.-S.,Hechi College
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

The synthetic indium-bearing zinc ferrite (IBZF) was mechanically activated by a stirring ball mill. The leaching behavior and dissolution kinetics of nonactivated as well as activated IBZF samples in sulphuric acid solution were investigated by using the zinc extraction as evaluating index. The influences of mechanical activation on the crystal structure, morphology, particle size and specific surface area were also characterized by means of X-ray diffractometer (XRD), scanning electron microscope (SEM), laser diffraction particle size analyzer and specific surface area analyzer. The results show that the physicochemical properties of IBZF are changed obviously by mechanical activation and thus enhance the reactivity of IBZF. When IBZF is mechanically activated for 30 and 60 min, the apparent activation energy decreases from 76.4 kJ/mol to 58.6 and 51.8 kJ/mol, respectively, the reaction order also decreases from 0.79 to 0.62 and 0.59. The acid leaching process of nonactivated IBZF is controlled by chemical reaction, but becomes the hybrid controlled process after mechanical activation. Source

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