Abstract
MOx-SiO2(M=Ce,Zr,Al) mixed oxides with a MOx:SiO2 mass ratio of 1:1 were prepared by co-precipitation.Pt-only diesel oxidation catalysts supported on these mixed oxides were obtained by the incipient wetness method.The catalytic activities in simplified diesel exhaust gas before and after SO2 treatment were analyzed.The catalysts were characterized by X-ray diffraction,N2 adsorption-desorption,NH3/O2/CO2 temperature programmed desorption(NH3/O2/CO2-TPD) and X-ray photoelectron spectroscopy(XPS).The results of NH3-TPD suggested that the surface of the catalysts had multiple acidic sites,and the number of medium-strength acidic sites increased following treatment with SO2.The results of O2-TPD revealed that there were α and β oxygen species in the catalysts,and the amount of O2 desorption decreased for the SO2-treated catalysts.The Pt/Al2O3-SiO2 catalyst exhibited the lowest surface acidity and the largest amount of oxygen desorption.XPS indicated that the binding energy of Pt 4f5/2 decreased when the catalysts were treated with SO2.All the catalysts showed excellent activity for CO and C3H8,and the Pt/ZrO2-SiO2 catalyst exhibited the best SO2 poisoning resistance,showing the potential for these catalysts to be applied in diesel oxidation.
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.
