Minimizing the Influence of Experimental Uncertainty for Delivered Methane/Steam Reforming Kinetic Equation by the Optimized Design of Experimentation

Thursday, 27 July 2017
Grand Ballroom East (The Diplomat Beach Resort)
A. Sciazko (AGH University of Science and Technology, Institute of Industrial Science, The University of Tokyo), Y. Komatsu (Institute of Industrial Science, The University of Tokyo), G. A. Brus (AGH University of Science and Technology), N. Shikazono (Institute of Industrial Science, The University of Tokyo), S. Kimijima (Shibaura Institute of Technology), and J. S. Szmyd (AGH University of Science and Technology)
One of the important issues in the future development of Solid Oxide Fuel Cells (SOFC) is increasing the fuel flexibility of the commercially available units. In order to provide the accurate models for SOFC coupled with internal indirect reformer or with direct internal reforming reactions, it is necessary to provide the reliable description of the reaction kinetic of fuel reforming process. This research focuses on the methane/steam reforming process and method to develop effective experimental-calculation procedure to deliver the reliable kinetic reaction rate expression.

The experimental studies were conducted on the NiO:YSZ (60:40vol%) catalyst, one of the most typical materials, for Solid Oxide Fuel Cell anodes. The experimental conditions included various temperatures, methane flow, steam-to-carbon ratios and nitrogen-to-carbon ratios, which defines each of the measurement points. The goal of this study was to decrease the number of necessary experimental measurements for the calculations of the empirical parameters defining the kinetic of methane/steam reforming reaction. By the analysis with the Orthogonal Least Squares Method and an analysis of a-posteriori covariance matrix, the experimentation process has been optimized. The proposed systematic approach was applied to evaluate the minimal number of measurements required to achieve the assumed accuracy of final solution and to reveal the influence of distribution of experimental condition for the quality of final reaction kinetic equation.

It was proved that the number of experimental measurements can be reduced without significant deterioration in the quality of solution, if the dismissed measurements are properly chosen. In the paper the correlation between design experimental condition and quality of delivered model for the methane/steam reforming reaction is discussed. The proposed deliberation can be extended and provide useful strategy for the design of experimental procedures for the estimation of empirical reaction kinetic for various catalytic materials.