Get access

Performance of mechanisms and reactor models for methane oxidation on Rh

Authors

  • Kenneth A. Williams,

    1. Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
    Current affiliation:
    1. Cargill, Inc., Process Solutions Technology Development Center, Crescent Ridge II, 10900 Wayzata Blvd., Suite 2-164, Minnetonka, MN 55305
    Search for more papers by this author
  • Raimund Horn,

    1. Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
    Search for more papers by this author
  • Lanny D. Schmidt

    Corresponding author
    1. Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
    • Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
    Search for more papers by this author

Abstract

Numerical simulations of methane catalytic partial oxidation on Rh-coated foam monoliths were performed and tested against high-resolution species and temperature profiles measured along the catalyst axis. A systematic comparison considering 2D models with heat and mass transport and a 1D reactor model with two multistep surface chemistry mechanisms is presented for feed conditions of 5 standard liters per minute, atmospheric pressure, and C/O ratios of 0.7, 1.0, and 1.3. Agreement between experimental data and the plug flow model and is for all conditions inferior to agreement with 2D models. 2D simulation profiles and the measured profiles agree qualitatively for all experimental conditions. Quantitative agreement is best for syngas stoichiometry (C/O = 1.0), while some differences are observed for C/O = 0.7 and 1.3. H2 and CO production in the presence of O2 is found to be strongly dependent on catalyst temperature. Accordingly, the importance of high-resolution spatial profiles for mechanism and reactor model validation is highlighted. © 2007 American Institute of Chemical Engineers AIChE J, 2007

Ancillary