Modeling of photocatalytic oxidation of VOCs in a packed bed reactor under continuous and discontinuous illuminations

Baoqing Deng; Shanshan Kong; Chang Nyung Kim

Korean Journal of Chemical Engineering, Vol.24, No.4, 577-582, July, 2007

DOI10.1007/s11814-007-0005-y Export Citation

Modeling of photocatalytic oxidation of VOCs in a packed bed reactor under continuous and discontinuous illuminations

Baoqing Deng^{1, 2}, Shanshan Kong¹, and Chang Nyung Kim^{2, 3, †}

¹College of Urban Construction & Environmental Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China
²Industrial Liaison Research Institute, China
³College of Advanced Technology, Kyung Hee University, Yongin 449-701, China

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In this paper, a mathematical model is presented to describe the photocatalytic degradation of VOCs in a packed bed reactor. Here, the adsorption of VOCs on the wall of the reactor is taken into account and the diffusion of VOCs in the axial direction is neglected. First-order kinetics is used to describe the photocatalytic oxidation of VOCs. The analytical solution of the present model is obtained by traveling wave method. The solution shows that the reactor performance is totally dependent on the inlet concentration of VOCs when the time is large enough. The present model is validated through the experimental result of the photocatalytic oxidation of trichloroethylene in a packed bed and the predicted results accord well with the experimental data. The influence of flow rate and inlet concentration on the performance of the reactor is discussed in detail. High flow rate offers high reaction rate and low conversion efficiency. The different inlet conditions and different reaction patterns are also investigated. The model would be useful to estimate the rate constant and help to the design of the reactor.

Keywords:Traveling Wave Method;Photocatalytic Oxidation;VOCs

[References]

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[1] Zhao J, Yang X, Building and Environment, 38, 645 (2003)

[2] Wang KH, Tsai HH, Hsieh YH, Appl. Catal. B: Environ., 17(4), 313 (1998)

[3] Wang KH, Tsai HH, Hsieh YH, Chemosphere, 36, 2763 (1998)

[4] Yamazaki S, Tsukamoto H, Araki K, Tanimura T, Tejedor-Tejedor I, Anderson MA, Appl. Catal. B: Environ., 33(2), 109 (2001)

[5] Arabatzis IM, Spyrellis N, Loizos Z, Falaras P, J. Mater. Process. Technol., 161, 224 (2005)

[6] Coronado JM, Zorn ME, Tejedor-Tejedor I, Anderson MA, Appl. Catal. B: Environ., 43(4), 329 (2003)

[7] Kim SB, Hong SC, Appl. Catal. B: Environ., 35(4), 305 (2002)

[8] Lee HJ, Kang DW, Chi J, Lee DH, Korean J. Chem. Eng., 20(3), 503 (2003)

[9] Liu H, Lian Z, Ye X, Shangguan W, Chemosphere, 60, 630 (2005)

[10] Mehrvar M, Anderson WA, Moo-Young M, Adv. Environ. Res., 6, 411 (2002)

[11] Changrani RG, Raupp GB, AIChE J., 46(4), 829 (2000)

[12] Nicolella C, Rovatti M, Chem. Eng. J., 69(2), 119 (1998)

[13] Mohseni M, Taghipour F, Chem. Eng. Sci., 59(7), 1601 (2004)

[14] Pareek VK, Cox SJ, Brungs MP, Young B, Adesina AA, Chem. Eng. Sci., 58(3-6), 859 (2003)

[15] Sobolev SL, Partial differential equations of mathematical physics, Dover Publications (1989)