Abstract
The deactivation of a supported platinum catalyst by long-term exposure to hexamethyldisiloxane was investigated. Ethyl acetate containing several tenfold excess of organosilicon relative to the real application was fed to the reactor. Three sets of catalyst and the blank support were aged for 350, 650, and 1000 h. The ex situ activity measurements on the aged pellets showed that all samples were deactivated as they were exposed to hexamethyldisiloxane. Silicon species were found at the surfaces of both the catalyst and the blank support. The quantitative analysis of silicon loading showed a linear profile versus poison exposure time and axial position in the bed. The radial silicon distribution in an individual pellet revealed an eggshell distribution of silicon residues, which is an indication of a diffusion-limited mechanism of silicon deposition. The deactivation was attributed to deposition of thin layer of silicon residues, which blocks the surface sites.
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