The effect of catalytic washcoat geometry on light-off in monolith reactors

摘要

This paper presents the results of a series of simulations of the light-off of carbon monoxide in excess oxygen in a single channel monolith reactor.The catalytic washcoat geometry is tested for its effect on the light-off position and shape.The simulations used a combination of two and three-dimensional modelling with non-linear oxidation kinetics.Different temperature ramp rates were employed.It is seen that the shape of the washcoat has an influence on the shape of the light-off curve,especially for high values of gas hourly space velocity and larger temperature ramp rates.The washcoat geometry that gives the fastest rise to complete conversion is the one that is the most non-uniform in shape;that is,the one that has thin sections.