Abstract
This contribution concerns the surface characterisation of the Pd–Ag/Al 2O 3 catalyst for the selective hydrogenation of acetylene. It is shown that, by means of the temperature programmed reduction (TPR) and temperature programmed desorption (TPD), it is possible to view the surface Pd sites of the catalyst prior to pretreatment with NO or N 2O, as well as seeing the effect of Ag addition. It is shown that hydrogen adsorption on the palladium is effectively inhibited by the presence of Ag. The role of pretreatment on the activity and ethylene gain enhancement reported in our previous communication is investigated by employing transmission infrared spectroscopy. Strong adsorption of nitrate or nitrite species on Pd surface was observed from NO and N 2O pretreatment, resulting in the blockage of Pd sites responsible for direct ethane formation. Accordingly, higher ethylene gain from NO x -treated catalysts was seen over the untreated catalyst.
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.
