Kinetic Peculiarities of Cu-Zeolite SCR Catalysts, and Their Practical Implications

Meeting Program – November 2017

Aleksey Yezerets
Aleksey Yezerets
Director of Advanced Chemical Systems & Integration
Cummins Inc.


Abstract – Cu-Zeolite SCR catalysts have emerged in the recent years as the leading technology for meeting the challenge of NOx reduction in diesel exhaust. Despite their excellent performance and stability characteristics, integrating this class of catalysts into an effective and durable exhaust aftertreatment system has proved non-trivial. Such systems must be capable of operating over a broad range of transient conditions, survive a variety of nominal and off-nominal aging exposures, and sustain their activity over many years of active duty. This requires a detailed understanding of the reaction mechanism and deactivation pathways, and the ability to translate those into reaction engineering guidance to system design, feedback control algorithms, and on-board diagnostics. In this presentation, we will share examples from our recent findings related to the controlling regimes of operation and to the deactivation mechanisms of Cu-Zeolite catalysts – at the level of catalyst material, chemical functions, and overall emission reduction performance in the context of a system which contains multiple catalytic elements. We will further discuss the advancements in the ability to model the behaviors of healthy and deactivated catalysts, and the respective implications to system optimization and control.

Biography – As Director of Advanced Chemical Systems & Integration with Corporate R&T Division of Cummins Inc., the world’s largest independent manufacturer of diesel engines and related equipment, Dr. Aleksey (Alex) Yezerets leads a team of experimentalists and modelers responsible for developing an understanding of the performance and deactivation of batteries, catalysts, and sensors, and for providing guidance and support to electrified and low-emission products at all stages of their lifecycles. He also coordinates a portfolio of collaborative research programs with industrial partners, National Labs, and universities. He has authored or co-authored 35 patents and 80 peer-reviewed publications, with over 2500 total citations. Alex maintains currency in his field by an active engagement in professional, editorial, and graduate education activities. His technical contributions have been recognized by awards from the Catalysis Club of Chicago, R&D100, ACS, AIChE and SAE, as well as by two Cummins Julius Perr awards for innovation. Alex has been elected an SAE Fellow.