Deactivation of the metal and acidic functions for Pt, Pt-Sn and Pt-Sn-K using physically mixed catalysts |
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Authors: | Sunee Srihiranpullop Piyasan Praserthdam Tharathon Mongkhonsi |
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Affiliation: | (1) Department of Chemical Engineering, Chulalongkorn University, 10330, Thailand |
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Abstract: | The effect of K addition on the amount and dispersion of carbon deposition on metal sites and support sites was investigated
on a physical mixture for hexane dehydrogenation. TPO, BET and ESR experiments were used for characterization. The K addition
significantly decreases catalyst deactivation involving the amount of coke deposits and the density of carbon radicals on
the metal and support sites because of ensemble and electronic effects, especially on the metal sites. Coke on the metal sites
associated with carbonaceous species rich in hydrogen is less polymerized than coke on the support sites, corresponding to
a more graphitic-like carbon. |
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Keywords: | Deactivation Pt-based Catalyst Pt-based Catalyst Modified with Sn and/or K Physically Mixed Catalyst |
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