Abstract
The effect of zinc addition on the catalytic properties of PtSnK/γ-Al2O3 catalyst for isobutane dehydrogenation has been investigated by reaction tests and some physicochemical characterizations such as nitrogen adsorption, H2 chemisorption, H2–TPD, NH3–TPD, TPR, TEM and TPO. It was found that suitable addition of Zn (0.2 and 0.4wt.%) to PtSnK/γ-Al2O3 catalyst could not only increase the platinum dispersion by geometric effect, but also decrease the carbon depositions. In these cases, the presence of zinc strengthened the interactions between Sn species and the support, thus inhibiting the reduction of Sn species. Among the catalysts studied, the PtSnKZn(0.4%)/Al catalyst exhibited the best performance in terms of isobutane conversion and stability. However, when the content of Zn was excessive, the interfacial character between metal and support, and the character of Pt metal had been changed. The formation of PtZn alloy resulted in the loss of catalytic activity and stability, while had a promoting effect for the reaction selectivity.
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.
