Abstract
A NOx chemisorption study was performed on yttria-stabilized zirconia (YSZ), an O2− ionically conducting ceramic. NO2 chemisorption on YSZ as well as NO+O2 interactions on Pt/YSZ catalyst were clearly correlated to the presence of surface oxygen vacancies. A remarkable NOx storage capacity was obtained on Pt/YSZ powdered catalysts, by combining nitrates formation and NO2 adsorption on oxygen vacancies. Under cycling conditions (lean phase/rich phase: 3min/2min) and using propene as a reductant, powdered Pt-Rh catalyst exhibited overall NOx abatement conversion of around 75% at 250 and 300°C. Pt/Rh/YSZ catalysts were finely dispersed in the porosity of SiC mini diesel particulate filters (DPFs). Quite reproducible and stable NOx conversions were achieved in cycling conditions with values around 50% between 250 and 400°C. In addition, YSZ-based catalysts have shown high thermal resistance and sulfur tolerance.
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.
