A Note on Zero-Order Reactions in Porous Catalysts

多乳觸媒中零次反應之簡釋

Larry K.Jang ； Roger L. York ； Lloyd R. Hile

《Journal of the Chinese Institute of Chemical Engineers》 34卷3期 (2003/05) Pp. 319-325

https://doi.org/10.6967/JCICE.200305.0319

並列摘要

Zero-order reactions occurring in porous catalysts have been either ignored or handled incorrectly in major textbooks. In this work, the long-held misconception of dc/dx =0 at x=0 (center of the catalyst) is corrected by placing c=0 add dc/dx =0 at a critical position xc for cases of Thiele modulus ＞ 1, where c is concentration and x is the distance measured from the center plane of a slab or the center of a cylinder or sphere. Exact solution for xc is presented for the slab geometry and numerical solutions for the cylindrical and spherical geometries. Effectiveness factors are also calculated. It will be shown that the condition of dc/dx = 0 at x = 0 yields erroneous results and the numerical scheme presented in this work accurately predicts xc and effectiveness factor for Thiele modulus＞ 1.

並列關鍵字

Zero-order ； Catalytic reaction ； Slab ； Cylinder ； Sphere ； Thiele modulus ； Effectiveness factor