A CAPE tool for evaluation of adsorber-reactor systems for treatment of exhausts from mobile sources

摘要

More than 50percent of overall unburned hydrocarbon pollutants from mobile sources arise during the cold start of engines. HC-traps combined with reactors form the basis of more than twenty proposed solutions patented in the last three years. Most often are the corresponding flowsheets based on delaying emissions of hydrocarbons by adsorption until the catalyst reaches the light-off and then the trapped hydrocarbons are released and oxidized. The flowsheets often combine several adsorbent or catalyst beds, with possible arrangements including by-passing, secondary air injection, electrical heating, etc. Four examples schematically representing selected patented configurations (1-4) are shown in Fig.1.