Light-Off Temperature Determination of Oxidation Catalyst Using Fourier Transform Infrared Technique

摘要

Light off temperatures of oxidation catalysts are considered as one of the important parameters for catalyst performance evaluation. In this study, the in situ Fourier Transform IR technique was developed and used to determine the light-off temperatures and reaction products of three three-way automotive catalysts with 20 torr monomethylamine in air at 0.5 L/min flow rate. Light-off temperatures were 140, 143, and 170 C for Davison, Allied-Signal, and Degussa oxidation catalysts, respectively. CO, CO2, H2O, and nitric acid were the major oxidation products. The activation energies of formation of CO and CO2 on the catalysts were also determined. Keywords: Light off temperature, Fourier transform; Infrared spectroscopy; Oxidation products; Oxidation; Catalyst. (mjm)