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Chen C.,Jiangsu University of Science and Technology | Cheng T.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2013

Avrami equation was applied to model the formation process of fly ash based Linde F (K) zeolite. The results showed that: (1) Linde F (K) zeolite could be gained through the reaction between fly ash and potassium hydroxide solutions and temperature seriously affected the reaction rate. (2) Avrami equation could be successfully used to analysis the kinetics process of Linde F (K) zeolite growth. (3) The formation of model of this zeolite is heterogeneous and the crystalline is linear growth. (4) The activation energy of zeolite crystalline and nucleation is about 134.5 and 85.4 kJ/mol, respectively.

Chen C.,Jiangsu University of Science and Technology | Cheng T.,Jiangsu City Vocational College
Journal of the Chemical Society of Pakistan | Year: 2013

The work focuses on evaluating wet air oxidation and catalytic wet air oxidation technique to degrade refinery spent caustics (original COD is 250,781 mg/L) in a milder operation conditions (150-200°C, 0.2-2.5MPa). The results show that: in non-catalyst WAO, the highest COD degradation conversion could reach about 75% when 200°C, 2MPa oxygen and 300rpm were used. At every temperature, the reaction procedures follow pseudo-first order equations and the activation energy is 45.5 kJ/mol. The reactivity of three main contaminants in wastewater is on the order of sulphide > petroleum > volatile phenol. The COD degradation conversion could improve to about 95% when composite catalyst MnOx-CeOx/γ-Al2O3 (W Mn/Wγ-Al2O3=0.5 and WCe/W MnOx/γ-Al2O3=0.4) was used. The pseudo-first order equations also could be applied for catalyst system and its activation energy decreases to 27.2 kJ/mol. The catalyst could improve the degradation efficiency of petroleum and volatile phenol. Their conversions could increase to 85% and 74% respectively after catalyst used.

Cheng T.,Jiangsu City Vocational College | Dai Y.Z.,Xiangtan University | Chen C.,Jiangsu University of Science and Technology | Huang Z.Q.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2012

The experiment was conducted to examine the potential of zero-valent iron (Fe 0) as the sole electron donor for reductive dechlorination of 2,4-dichlorophenol by mixed culture. The optimal conditions and the sustainability of 2,4-dichlorophenol dechlorination in Fe 0+microbe system were also investigated. The results showed that, Fe 0 was an effective electron donor to stimulate reductive dechlorination of 2,4-dichlorophenol and 2,4-dichlorophenol (30 mg L -1) could be transformed completely within 68 h. The rate was similar to that with acetate or lactate as electron donor, while the rate was slow with glucose as electron donor. The quantity of Fe 0, inoculation added and pH had a significant effect on 2,4-dichlorophenol dechlorination. The optimal quantity of Fe 0, inoculation added and initial pH was 2.0 g L -1, 646.4 mg volatile suspended solid L -1 and 8, respectively. Fe 0 sustained 2,4-dichlorophenol dechlorination over a long period. 4-Chlorophenol was the intermediate roduct from 2,4-dichlorophenol, but it was difficult to be further degraded.

Cheng T.,Jiangsu City Vocational College | Chen C.,Jiangsu University of Science and Technology | Xie W.F.,Jiangsu City Vocational College
Asian Journal of Chemistry | Year: 2014

Reaction kinetics of fly ash in Al2O3-NaOH solution system were analyzed by a modified "Jander" equation. After kinetics analysis, only two reaction stages could be found during the reaction process. Stage 1, the reaction process was limited by diffusion through a porous layer. Stage 2, the reaction process was controlled by diffusion through a dense layer. The rate constants of stage 2 were in the order of 7.5 M NaOH (0.00609), Al2O3/Na2O = 0 > 7.5 M NaOH, Al 2O3/Na2O = 0.0066 > (0.00404) > 7.5 M NaOH, Al 2O3/Na2O = 0.013 (0.00301) > 7.5 M NaOH, Al2O3/Na2O = 0.033 (0.00128).

Gu J.,Jiangsu University | Gu J.,Jiangsu City Vocational College | Fan J.,Jiangsu University | Fan J.,Jiangsu City Vocational College | shen h.,Nanjing University of Aeronautics and Astronautics
Applied Mechanics and Materials | Year: 2012

Focus on the problem of steering trajectory tracking, a tracking control law based on dynamic surface is proposed. Other than existing methods, this paper considers combined lateral position and yaw synchronously control. The first order low pass filter is used to obtain the differential items of the lateral position and yaw, so as to eliminate the high order derivative from the final expression of the close loop law. This characteristic is very useful especially in real applications. The Lyapunov approach is employed to analysis the stability of the tracking system, and the convergence of the system is achieve. Simulation result validates the outstanding effectiveness of the proposed method for steering trajectory tracking. © (2012) Trans Tech Publications, Switzerland.

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