Bimetallic catalysts based on Sn-zeolites for the reduction of NOx under lean conditions

Abstract:

Contrarily to what it occurs with other air pollutants such as SO2 or CO, the NOx emissions coming mainly from automotive exhaust engines are increasing in the last years and their control becomes an urgent necessity. In fact, at the moment does no exist a technology to solve adequately this problem in spite of the more restrictive NOx legislation. Among the emission control technologies envisaged, the most widely applied methods are the selective catalytic reduction by NH3 for stationary sources and the three way catalysts for mobile sources. The former one needs the use of a pollutant as ammonia that makes the operation of the utility complicated. The three way catalysts give excellent results when the air to fuel ratio is near to the stoichiometric ratio, however the efficiency diminish quickly when there is an excess of oxygen. Nowadays the trend is to use engines with better fuel efficiency, this is lean burn …

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