Abstract
The influence of the silver valence state on Ag/Al2O3 on the water tolerance of H2-C3H6-SCR of NOx was investigated. The valence state of silver species on Ag/Al2O3, which was carefully characterized by XPS, UV-vis, and XANES measurements, was adjusted by varying the calcination temperature from 500 oC to 900 oC. Oxidized silver species were predominant on Ag/Al2O3 calcined at temperatures below 600 oC (LT-catalysts), while further increasing the calcination (temperatures above 600 oC, HT-catalysts) promoted the transformation of oxidized silver species into metallic silver clusters. The samples with higher amounts of oxidized silver species exhibited better water tolerance in the H2-C3H6-SCR. Activation energy measurements confirmed that the mechanism of NOx reduction on these catalysts was the same. In situ DRIFTS studies demonstrated that metallic silver species promoted the formation of active enolic species and the complete oxidation of formate, thus improving the low-temperature activity of HT-catal...
Sign-in/Register to access full text options 
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.
