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Sponsoredby the Department of Chemical and Biomolecular Engineering Rajamani P. Gounder Perdue University “DynamicInteractions Between Copper Active Sites in Zeolites During NOx PollutionAbatement Catalysis” Tuesday, February 17, 2026, 11:30 a.m.201 LGRT, UMass Amherst(Refreshmentsat 11:15 a.m.) Abstract:Theselective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia usingCu-exchanged zeolites is a pollution abatement technology used commercially indiesel emissions control. At low temperatures (<523 K), Cu ion active sitesbecome solvated by ammonia reactants to form homogeneous-like coppercoordination complexes that are bonded ionically to anionic aluminum centers inzeolite lattices. The ionic tethering of metal active sites to the zeolite hostsupport confers localized mobility, providing a mechanism for the dynamic andreversible interconversion of mononuclear and binuclear sites, mergingattractive features of both heterogeneous and homogeneous catalysts. We combineexperimental and computational approaches to interrogate catalysts in operando under widely varyingoperating conditions, including beyond those typical of commercial operation.We show that the effects of Cu ion mobility are preeminent for low-temperatureNOx SCR reactivity and selectivity, leading to dramatic differences inperformance among Cu-zeolites of different bulk and atomic structure. Bio:RajGounder is the R. Norris and Eleanor Shreve Professor of Chemical Engineeringat Purdue University. He received his BS in Chemical Engineering with a doublemajor in Chemistry from Wisconsin in 2006, his PhD in Chemical Engineering fromUC-Berkeley in 2011, and a postdoctoral appointment at Caltech in 2013. Hisresearch group studies catalysis for applications in energy production andenvironmental protection, including automotive pollution abatement andconverting carbon feedstocks such as shale gas to fuels and chemicals. Hisresearch focuses on elucidating the kinetic and mechanistic details ofcatalytic reactions, synthesizing zeolites with tailored site and surfaceproperties, and developing methods to characterize and titrate active sites incatalytic materials. Hisresearch has been recognized by the PECASE award, the NSF and DOE Early CareerAwards, the ACS Early Career in Catalysis Award, and the Sloan ResearchFellowship in Chemistry. His teaching has been recognized by the Shreve(undergraduate) and Wankat (graduate) Awards for Outstanding Teaching inChemical Engineering at Purdue, and his mentoring by the Outstanding MentoringAward of Engineering Graduate Students at Purdue. He is an Associate Editor of Science Advances and Reaction Chemistry & Engineering.
📍 LGRT 201