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.