Destruction of NO during Catalytic Combustion on Platinum and Palladium

Abstract

Mole fraction profiles of NO are obtained by laser-induced fluorescence in a catalytic combustion environment consisting of a stagnation flow of hydrogen, oxygen, and 150 ppm of NO over platinum and palladium substrates. For both catalysts under a wide range of equivalence ratios, including lean conditions, diffusion limited destruction of the added NO is observed when catalytic combustion occurs at the surface. With ignition in the gas-phase and a flow over the platinum surface, negligible NO destruction is observed under fuel-lean conditions. The profiles are compared with the predictions of a flame model that includes complex gas-phase and surface chemistry. The results highlight the need for inclusion of heterogeneous NO removal steps in surface modeling of catalytic combustion systems.

Keywords:

• catalytic combustion
• NO
• Pt
• Pd
• hydrogen-oxygen

Additional information

Notes on contributors

NICK G. GLUMAC

Corresponding Author/ Nick G. Glumac, Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801. Tel: [phone], FAX: [phone], Email: [email protected]