کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6589226 | 456834 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modeling reaction-diffusion processes within catalyst washcoats: II. Macroscale processes informed by microscale simulations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Modeling reaction-diffusion processes within catalyst washcoats: II. Macroscale processes informed by microscale simulations Modeling reaction-diffusion processes within catalyst washcoats: II. Macroscale processes informed by microscale simulations](/preview/png/6589226.png)
چکیده انگلیسی
This paper first develops a two-dimensional Thiele-type cylindrical-pore model that predicts catalytic washcoat performance, albeit for idealized cylindrical pores. The primary purpose for the cylindrical-pore model is to serve as a basis of comparison with three-dimensional models of catalytic performance in actual geometrically complex washcoat pores that are tomographically reconstructed from focused-ion-beam-scanning-electron-microscopy (FIB-SEM) measurements. In both models, the reaction-diffusion processes are characterized by a Damköhler number that is based on a pore diffusion coefficient and a single first-order reaction rate. Performance metrics include effective product flux from the pores, pore effectiveness, and reaction depth within the pore. In all cases, the models are generalized by casting the conservation equations and performance metrics as dimensionless variables. The paper then derives expressions to upscale individual pore performance to full-scale washcoats. The new understanding that emerges from these studies provides qualitative and quantitative insight that can assist the design and fabrication of improved washcoat microstructures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 145, 12 May 2016, Pages 308-316
Journal: Chemical Engineering Science - Volume 145, 12 May 2016, Pages 308-316
نویسندگان
Justin M. Blasi, Peter J. Weddle, Canan Karakaya, David R. Diercks, Robert J. Kee,