Pilot-scale investigation of Pt/alumina catalysts deactivation by organosilicon in the total oxidation of hydrocarbons.

Larsson, Ann-Charlotte; Rahmani, Mohammad; Arnby, Karl; Sohrabi, Morteza; Skoglundh, Magnus; Cruise, Neil; Sanati, Mehri

The deactivation of alumina-supported platinum catalyst for VOC oxidation by long-term exposure for hexamethyldisiloxane (HMDS) has been investigated in a pilot scale reactor for up to 1000 h of exposure. Catalyst samples were characterized by ICP-AES, BET and silicon deposition by SEM. Catalyst activity was investigated using oxidation of ethyl acetate showing deactivation of the catalyst samples as exposed to HMDS increasing with exposure time. Silicon was shown to deposit on the catalyst as well as on the blank alumina support. SEM investigation of an individual pellet revealed a radial eggshell silicon distribution. CO chemisorption showed strong decrease of Pt active sites after deactivation, while still maintaining reasonable oxidation levels of ethyl acetate.

CATALYST poisoning; PLATINUM; VOLATILE organic compounds; ACETATES; ORGANOSILICON compounds; CATALYSIS

Topics in Catalysis, 2007, Vol 45, Issue 1-4, p121

1022-5528

Academic Journal

10.1007/s11244-007-0251-6