Introduction

Research group Monolith at the University of Chemistry and Technology in Prague focuses mainly on the study of automotive exhaust gas catalysts. Mathematical models of catalytic monoliths and predictive simulation software are being developed on the basis of dynamic measurements. The experimental equipment consists of computer-controlled lab reactor and fast on-line gas analysers. The inlet gas mixture is dynamically prepared from synthetic gases representing the main components of automobile exhaust gas - CO, O2, C3H6, C3H8, heavier hydrocarbons (decane, toluene etc.), H2, NO, NO2, NH3, N2, CO2 and H2O.

Catalyst configurations and operation modes leading to minimum emissions of harmful components are examined both experimentally and by the simulations. Many projects are done in co-operation with research partners from the automotive industry, e.g., Daimler AG (Mercedes-Benz car manufacturer), Johnson Matthey, Umicore and Ecocat (catalyst manufacturers). The research includes three-way catalysts (TWC) for gasoline engines, Diesel oxidation catalysts (DOC) with adsorption of hydrocarbons, and NOx storage-reduction catalysts (NSRC, called also Lean NOx traps, LNT), selective catalytic reduction of NOx by NH3 (SCR), Diesel particulate filters (DPF), passive hydrocarbon and NOx adsorbers, and combined exhaust gas aftertreatment systems.

The research group Monolith is also active in development of novel methods for detailed modelling of porous catalysts in micro-/nano-scale, involving 3D digital reconstruction from electron microscopy and tomography, and multi-scale models of reaction and transport. These models allow to predict effective diffusivity and performance of the catalyst in dependence on the its morphology and pore structure.
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