Add time:08/24/2019 Source:sciencedirect.com
AFM and XPS data for model Pd supported catalysts show that the morphology of these catalysts is greatly affected by reduction in hydrogen and by addition of sulfur compounds to the surface before reaction. It was found that reduction of the catalyst before thiophene addition decreases the S/Pd ratio at which complete deactivation occurs. It was found that both the activation energy and the pre-exponential factor are quasi linear functions of sulfur coverage. Kinetic results after 1-Butanethiol (cas 109-79-5) addition reveal a decreasing activation energy and pre-exponential parameter with increasing S/Pd ratio. Sulfur adsorption not only reduces the number of active sites but also weakens the adsorption strength of the remaining sites. It is demonstrated that physico-chemical information from AFM & XPS combined with kinetic data enables prediction of conversion at other conditions based on the S/Pd ratio.
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