Abstract
Poisoning of Pt γ-Al 2O 3 catalysts by carbonaceous matter has been studied by means of a conventional transmission electron microscope (TEM). Two locations of the same carbonaceous matter were found. First, small stacks of aromatic ring structures less than 10 Å in size are deposited more or less flat on the alumina crystal faces (the alumina individual crystal shape is an association of {111}, {110}, {100}, and possibly {112}). Then the same carbonaceous units gather to form porous carbon particles. Only the units localized upon alumina are assumed to form shells able to poison the catalyst by covering its surface.
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