Selective catalytic reduction (SCR) of NOx with ammonia using metal-exchanged zeolites is now being commercialized on diesel vehicles.  In particular, small-pore zeolites with a chabazite (CHA) structure are being used due to their high activities and selectivities, their hydrothermal stability, and their minimal deactivation in the presence of unburned hydrocarbons. We recently published the first open-literature paper describing the comparative performance of a Cu-CHA (SSZ-13) catalyst relative to Cu-Beta and Cu-ZSM-5 for the SCR of NOx with NH3, particularly focusing on the activity and N2 selectivity. In this presentation, we will describe results of more recent studies of this and another CHA zeolite, SAPO-34, that address a number of additional aspects of the reactivity of these catalysts, as well as structural studies that account for the relative performance of these materials.  The implications of these results for understanding the NH3 SCR reaction mechanisms will also be discussed.

Microporous Cu-CHA materials for the selective catalytic reduction of NOx with NH<sub>3</sub>:  Catalyst structure/function and mechanistic studies

246th National Meeting (2013)

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Microporous Cu-CHA materials for the selective catalytic reduction of NOx with NH3: Catalyst structure/function and mechanistic studies

Microporous Cu-CHA materials for the selective catalytic reduction of NOx with NH₃: Catalyst structure/function and mechanistic studies