Operando FTIR-MS of monolithic shaped catalysts demonstrates that reaction-generated water hydrolyzes the surface V=O species along the channels of a vanadia titania monolith. This effect creates new Br�nsted acid sites and consumes the remaining Lewis ones during the SCR reaction. This was demonstrated during a reaction sequence in an integral monolithic reactor pre-adsorbed with ammonia, by titrating the surface with NO and O2. These observations bring further insight to more fundamental work performed on kinetically restricted pelletized or powdered catalysts.This configuration allows us to obtain valuable information on secondary effects from the water produced upstream. Furthermore, the use of multi component analysis techniques allowed us to differentiate between bands from adsorbed ammonia and adsorbed water. This makes it possible to easily evaluate the interplay between Lewis and Br�nsted acid sites on vanadia based catalysts during reaction, even in the shape of a genuine monolithic shaped catalyst.

<i>Operando </i>FTIR-MS study of monolithic shaped catalysts during SCR reaction

244th National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Operando FTIR-MS study of monolithic shaped catalysts during SCR reaction