Abstract
Understanding detrimental effects of water in the low-temperature NH3-SCR is very important for advancing the design of novel catalytic materials. Herein, the effects of 5 vol% H2O on the performance of NH3-SCR over Mn2Cu1Al1Ox-LDO were investigated through steady-state and transient kinetic analysis of step-gas switching experiments, in-situ DRIFTS and 15NO-SSITKA-DRIFTS operando. Water exhibited a significant negative activity effect at T<180 °C. Slightly positive activity (200–300 °C) and N2-selectvity (120–300 °C) effects were observed due to suppression of NH3 oxidation and NH4NO3 decomposition to N2O. The decline in activity at 140 °C by ∼ 45 % in the presence of water was found to be related to the decrease of the site activity (k) and not of surface coverage (θ) of active species formed in the NH3-SCR reaction paths of N2/N2O formation. An increase in the concentration of inactive NOx-s might also contribute to the inhibitive effect of water.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
