Abstract
Carbonaceous deposits (coke) formed on zeolites H-ZSM-5 and Linde L during methanol conversion at 460°C have been studied with transmission electron microscopy (TEM). At ca. 6% (w/w) of coke, deposits could just be detected, and at ca. 10% (w/w) the zeolite was enveloped in coke layers > 5 nm thick. Catalyst performance was not affected by coke deposits which were void of any structure in the transmission electron microscope (amorphous), but catalysts became deactivated when coke deposits contained packets of aromatic sheets of carbon parallel to the catalyst surface.
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