Impact of Different Synthesis Methods on the Low-Temperature Deactivation of Cu/SAPO-34 for NH3-SCR Reaction
Journal article, 2021

SAPO-34 were synthesized using three structure-directing agents (SDAs), i.e., tetraethylammonium hydroxide (TEAOH), triethylamine (TEA), and morpholine (MO). These SAPO-34 supports were used to prepare Cu/SAPO-34 catalysts via two different Cu-exchange methods: incipient wetness impregnation (IWI) and solid-state ion exchange (SSIE). The catalytic performance of Cu/SAPO-34(TEAOH, TEA, MO) catalysts prepared with IWI and SSIE before and after exposure to water vapor at 70 °C was systemically examined, and their deactivation behavior during low-temperature NH3-SCR reaction was studied. These catalysts were characterized by XRD, BET, ICP-SFMS, SEM/EDX, solid-state NMR, CO-DRIFTS, NO-DRIFTS, and H2-TPR. The various characterization findings for the Cu/SAPO-34 catalysts suggest that the distribution of different Cu2+ species and the mobility of Cu2+ in chabazite (CHA) structure are important for the low-temperature deactivation and regeneration behaviors of the Cu/SAPO-34(TEAOH, TEA, MO)-IWI and -SSIE during the NH3-SCR reaction. Thus, it has been determined that the choice of SDA and Cu-exchange method is vital to design of an efficient Cu/SAPO-34 catalyst that is highly active during a NH3-SCR reaction and has a high tolerance for the low-temperature deactivation caused by exposure to water vapor.

Synthesis methods

NH SCR, Cu/SAPO-34 3

Different SDAs

Low-temperature deactivation


Jung Won Woo

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Aiyong Wang

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Diana Bernin

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Homayoun Ahari

Fiat Chrysler Automobiles N.V.

Mark Shost

Fiat Chrysler Automobiles N.V.

Michael Zammit

Fiat Chrysler Automobiles N.V.

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Emission Control Science and Technology

21993629 (ISSN) 21993637 (eISSN)

Vol. 7 3 198-209

Subject Categories

Inorganic Chemistry

Other Chemical Engineering

Organic Chemistry



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1/3/2024 9