WJET  Vol.2 No.2 , May 2014
Intrinsic Kinetics of Hydrorefining Catalyst in Ex-Situ Presulfurization
Abstract: The intrinsic kinetics of hydrorefining catalyst in ex-situ presulfurization was investigated using a fixed-bed penetrating method. A mathematical model was built to express the intrinsic kinetics of presulfurization using an unreacted shrinking core model for catalyst grains and one-dimension unhomogeneous model for beds, and then the significance of the new model was tested. Results show that the presulfurization with hydrorefining catalyst was a nonstationary process, as the reaction rate changed with time, and this first-order reaction displayed high activation energy. In this dynamic mathematical model, a correction coefficient f0 was introduced into the common power-function-formed rate equation, which indicated the effects of solid diffusion on reaction. The model with high significance was able to improve the presulfurization rate and the raw material utilization ratio, thus providing theoretical guidance for achieving high presulfurization effects.
Cite this paper: Zhang, J. , Wang, J. and Wu, K. (2014) Intrinsic Kinetics of Hydrorefining Catalyst in Ex-Situ Presulfurization. World Journal of Engineering and Technology, 2, 109-115. doi: 10.4236/wjet.2014.22012.

[1]   Ho, T.C. and Reyes, S.C. (1990) Design of Catalyst Sulfiding Procedures. Chemical Engineering Science, 45, 2633-2638.

[2]   Dou, T. (1981) The Importance of Pore Structure and Diffusion in the Kinetics of Gas-Solid Non-Catalytic Reactions: Reaction of Calcined Limestone with SO2. Chemical Engineering Journal, 21, 213-222.

[3]   Ortega, A. (2008) A Simulation of the Mass-Transfer Effects on the Kinetics of Solid-Gas Reactions. International Journal of Chemical Kinetics, 40, 217-222.

[4]   Levêque, G. and Abanades, S. (2013) Kinetic Analysis of High-Temperature Solid-Gas Reactions by an Inverse Method Applied to ZnO and SnO2 Solar Thermal Dissociation. Chemical Engineering Journal, 217, 139-149.

[5]   Xu, Z.J., Sun, X. and Mohammad, A.K. (2012) A Generalized Kinetic Model for Heterogeneous Gas-Solid Reactions. Journal of Chemical Physics, 137, 074702-074708.

[6]   Alenazey, F., Cooper, C.G., Dave, C.B., Elnashaie, S.S.E.H., Susu, A.A. and Adesina, A.A. (2009) Coke Removal from Deactivated Co-Ni Steam Reforming Catalyst Using Different Gasifying Agents: An Analysis of the Gas-Solid Reaction Kinetics. Catalysis Communications, 10, 406-411.

[7]   Gómez-Bareaa, A., Olleroa, P. and Lecknerb, B. (2007) Mass Transport Effects during Measurements of Gas-Solid Reaction Kinetics in a Fluidised Bed. Chemical Engineering Science, 62, 1477-1493.

[8]   Bab, M.A. and Mendoza-Zelis, L. (2004) A Model for the Kinetics of Mechanically Assisted Gas-Solid Reactions. Scripta Materialia, 50, 99-104.

[9]   Segal, E. (2004) Fractal Approach in the Kinetics of Solid-Gas Reactions. Journal of Thermal Analysis and Calorimetry, 76, 933-934.

[10]   Budrugeac, P. and Segal, E. (2005) On the Use of Diefallah’s Composite Integral Method for the Non-Isothermal Kinetic Analysis of Heterogeneous Solid-Gas Reactions. Journal of Thermal Analysis and Calorimetry, 82, 677-680.

[11]   Michele, P., Loic, F. and Michel, S. (2011) From the Draw-backs of the Arrhenius-f(alpha) Rate Equation towards a More General Formalism and New Models for the Kinetic Analysis of Solid-Gas Reactions. Thermochimica Acta, 525, 93-102.

[12]   Zhu, B.C. (2001) Chemical Reaction Engineering. 3th Edition, Chemical Industry Press, Beijing.

[13]   Liu, F., Fang, D.Y. and Shi, T.B. (2004) Research on the Intrinsic Kinetics of NT705 Type Sorbent for Sulfide Removal. Journal of Chemical Industry & Engineering, 25, 21-24.

[14]   Devore, J.L. (2011) Probability and Statistics: For Engineering and the Sciences. 8th Edition, Cengage Learning, Boston.