This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Sulfur Poisoning of a Cu-SSZ-13 SCR Catalyst under Simulated Diesel Engine Operating Conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 06, 2021 by SAE International in United States
Annotation ability available
Event: SAE WCX Digital Summit
Cu-SSZ-13 catalysts are widely used for diesel aftertreatment applications for NOx (NO and NO2) abatement via selective catalytic reaction (SCR) due to their high conversion efficiency and excellent hydrothermal stability. Diesel engine exhaust contains small amounts of SOx due to the combustion of sulfur compounds in diesel fuel. The engine out SOx level mainly depends on the sulfur content in the diesel fuel. The presence of SOx from engine exhaust can deteriorate the SCR performance of Cu-SSZ-13 catalysts in real-world applications. This work is focused on the sulfur-induced deactivation process of a Cu-SSZ-13 catalyst under a range of simulated diesel engine operating conditions. Two catalyst deactivation modes, namely chemical poisoning and physical poisoning, are identified, primarily depending on the operating temperature. Chemical poisoning mainly results from the interaction between SOx and Cu species within the zeolite framework. Physical poisoning is a consequence of the accumulation of ammonium (bi) sulfate formed from the interaction between SOx and NH3, especially at low temperature conditions. Temperature programmed desorption (TPD) experiments were conducted to characterize the deactivated catalyst. In addition, a modeling approach was applied to quantify the deactivation process as well as the decomposition of the sulfur species on the poisoned catalyst to optimize the catalyst reactivation strategy.
CitationXi, Y., Ottinger, N., Su, C., and Liu, Z., "Sulfur Poisoning of a Cu-SSZ-13 SCR Catalyst under Simulated Diesel Engine Operating Conditions," SAE Technical Paper 2021-01-0576, 2021.
- Wall , J.C. , Hoekman , S.K. Fuel Composition Effects on Heavy-Duty Diesel Particulate Emissions SAE Technical Paper 841364 1984
- Xi , Y. , Ottinger , N.A. , and Liu , Z.G. New Insights into Sulfur Poisoning on a Vanadia SCR Catalyst under Simulated Diesel Engine Operating Conditions Appl. Catal. B Environ. 160-161 1 −9 2014
- Jangjou , Y. , Do , Q. , Gu , Y. , Lim , L.G. et al. Nature of Cu Active Centers in Cu-SSZ-13 and Their Responses to SO2 Exposure ACS Catal. 8 1325 −1337 2018
- Shih , A.J. , Khurana , I. , Li , H. , González , J. et al. Spectroscopic and Kinetic Responses of Cu-SSZ-13 to SO2 Exposure and Implications for NOx Selective Catalytic Reduction Appl. Catal. A Gen. 574 122 131 2019
- Cheng , Y. , Lambert , C. , Kim , D.H. , Kwak , J.H. et al. The Different Impacts of SO2 and SO3 on Cu/zeolite SCR Catalysts Catal. Today 151 266 −270 2010
- Hammershøi , P.S. , Vennestrøm , P.N.R. , Falsig , H. , Jensen , A.D. , and Janssens , T.V.W. Importance of the Cu Oxidation State for the SO2-poisoning of a Cu-SAPO-34 Catalyst in the NH3-SCR Reaction Appl. Catal. B Environ. 236 377 383 2018
- Xi , Y. , Ottinger , N.A. , Keturakis , C. , and Liu , Z.G. A Case Study of a Cu-SSZ-13 SCR Catalyst Poisoned by Real-World High Sulfur Diesel Fuel SAE Technical Paper 2020-01-1319 2020 https://doi.org/10.4271/2020-01-1319
- Xi , Y. , Su , C. , Ottinger , N.A. , and Liu , Z.G. Effects of Hydrothermal Aging on the Sulfur Poisoning of a Cu-SSZ-13 SCR Catalyst Appl. Catal. B Environ 284 119749 2021
- Gao , F. , Water , E.D. , Kollar , M. , Wang , Y. et al. Understanding Ammonia Selective Catalytic Reduction Kinetics Over Cu/SSZ-13 from Motion of the Cu Ions J. Catal. 319 1 −14 2014
- Saur , O. , Bensitle , M. , Mohammed Saad , A.B. , Lavalley , J.C. et al. The Structure and Stability of Sulfated Alumina and Titania J. Catal. 99 104 110 1986
- Xi , Y. , Ottinger , N.A. , and Liu , Z.G. Simulation of Exotherms from the Oxidation of Accumulated Carbonaceous Species Over a VSCR Catalyst React. Chem. Eng. 4 1090 2019