Ammonia Titration Methods Probe the Dynamic Nature of Brønsted Acid Sites in Cu-SSZ-13 during NOx Selective Catalytic Reduction

Di Iorio, John

Monday, June 15, 2015

Ballroom B (Lawrence Convention Center)

Shane A. Bates¹, John Di Iorio¹, Anuj Verma¹, W. Nicholas Delgass¹, Fabio H. Ribeiro¹, Jeffrey T. Miller² and Rajamani Gounder¹, (1)Purdue University, USA, (2)Argonne National Laboratory, USA.

Titrations using gaseous NH₃ enable quantification of Brønsted acid sites present on catalytic surfaces before, during, and after reaction. NH₃ titrations on Cu-SSZ-13 zeolites, detect kinetically-relevant H⁺ sites generated in situ during the selective catalytic reduction (SCR) of NOx, providing a new mechanistic link to SCR redox cycles proposed earlier.

Extended Abstracts:

141030 2015 NAM Abstract NH3 Titrations-Final.pdf (114.7KB) - Extended Abstract

P-Mo-B-179 Ammonia Titration Methods Probe the Dynamic Nature of Brønsted Acid Sites in Cu-SSZ-13 during NOx Selective Catalytic Reduction