Abstract
Mn Ce oxides were supported on TiO 2 and Al 2O 3 by an ultrasonic impregnation method and used for selective catalytic reduction (SCR) of NO with NH 3 at low-temperature (80–220 °C). Mn Ce/TiO 2 showed a relatively higher SCR activity than Mn Ce/Al 2O 3 at the temperature range of 80–150 °C. When the reaction temperature was higher than 150 °C, Mn Ce/Al 2O 3 exhibited superior SCR activity to Mn Ce/TiO 2. NH 3 temperature programmed desorption study proved that Mn Ce/TiO 2 was mainly Lewis acidic, while Mn Ce/Al 2O 3 could provide more Brönsted acid sites. These acid sites play an important role in SCR according to in situ diffuse reflectance infrared transform spectroscopy (DRIFT) analysis. The main SCR reaction was a typical Eley–Rideal mechanism on Mn Ce/TiO 2, which took place between coordinated NH 3 / NH 4 + and gas-phase NO. For Mn Ce/Al 2O 3, the reaction mainly occurred via another pathway when the temperature exceeded 150 °C, which commenced with the adsorption and oxidation of NO and was followed by reaction between NO 2 or NO 2-containing compounds and NH 3 adspecies. This reaction pathway makes a significant contribution to the improved NO conversion for Mn Ce/Al 2O 3 at higher temperature.
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.
