Abstract
On Au/NaY a very high degree of dispersion is achieved, but gold particles migrate and then agglomerate when reduction occurs. This deterioration is slowed or prevented by c0-exchanging various cations into the zeolite, including transition metal cations such as Cr, Fe, Ni and Co. These co-exchanged systems are much more stable and exhibit very high activities even at temperatures of 400–500 °C. The effect is dependent on the reduction potential of the co-exchanged metals concerned. As the reduction potential becomes more negative, Ni2+, −0.23 ≪ Fe3+, −0.41 < Cr3+, −0.56; the catalytic activity for CO oxidation increase. Promoted AuY catalysts exhibit activities (TOF) not much lower than other highly active systems such as Au-titania. Despite the stability of the promoted Au-zeolites, their performance is still insufficient for high temperature applications of gold.
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.
