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Operando Spectroscopic Studies of Cu–SSZ-13 for NH3–SCR deNOx Investigates the Role of NH3 in Observed Cu(II) Reduction at High NO Conversions

DOI: 10.1007/s11244-018-0888-3 DOI Help

Authors: Alex Greenaway (UCL London; Research Complex at Harwell) , Ines Lezcano-gonzalez (UCL London; Research Complex at Harwell) , Miren Agote-aran (UCL London; Research Complex at Harwell) , Emma Gibson (UCL London; Research Complex at Harwell) , Yaroslav I. Odarchenko (UCL London; Research Complex at Harwell) , Andrew Beale (UCL London; Research Complex at Harwell)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Topics In Catalysis , VOL 50

State: Published (Approved)
Published: January 2018
Diamond Proposal Number(s): 15151

Open Access Open Access

Abstract: The small pore zeolite chabazite (SSZ-13) in the copper exchanged form is a very efficient material for the selective catalytic reduction by ammonia (NH3) of nitrogen oxides (NOx) from the exhaust of lean burn engines, typically diesel powered vehicles. The full mechanism occurring during the NH3–SCR process is currently debated with outstanding questions including the nature and role of the catalytically active sites. Time-resolved operando spectroscopic techniques have been used to provide new level of insights in to the mechanism of NH3–SCR, to show that the origin of stable Cu(I) species under SCR conditions is potentially caused by an interaction between NH3 and the Cu cations located in eight ring sites of the bulk of the zeolite and is independent of the NH3–SCR of NOx occurring at Cu six ring sites within the zeolite.

Journal Keywords: Catalysis; Operando; XANES; Cu–SSZ-13; Zeolite

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Other Facilities: Swiss Light Source