| Automotive-based exhaust is a major contributor to air pollution, and legislation controls the emission of several components. Catalytic converters are used to reduce these emissions to acceptable levels. As legislation becomes more stringent, better catalysts are required, and better kinetic models can accelerate the design of these models.;This work considers the kinetics of the oxidation of CO and hydrogen on a Pt monolith diesel oxidation catalyst under lean conditions. The study of CO oxidation alone, while well documented in the literature, is a necessary step in the development of a complete model. CO oxidation is studied using both temperature ramp and concentration step experiments. These experiments are modelled and discussed.;The selectivity of the catalyst toward CO is observed during light-off experiments of CO and hydrogen mixtures. Literature models are modified to correctly model this selectivity, improving the validity of the modified model.;The hydrogen-promotion effect, whereby the presence of hydrogen promotes CO oxidation during light-off, is discussed and modelled. Experimental and numerical results are shown and compared, and modifications to the standard literature models are proposed. These modifications model the behaviour of the catalyst for mixtures of CO (up to 2000 ppm), hydrogen (up to 2000 ppm) and oxygen (6%), including the catalyst selectivity and the hydrogen promotion effect. |
