RADIOTRACER EXPERIMENTS ON CARBON FORMATION IN ZEOLITES .2.

Carbon deposition in a 10-ring zeolite was traced with radioactively labeled mixtures of hexane and aromatics and was compared with earlier results on 12-ring structures. Although coke yields differed by 1 to 2 orders of magnitude between the two structural classes, it was shown that the origin of the carbon deposits in both was strikingly similar, involving nearly equal participation of both paraffin and aromatic. The data supported the assertion that coke results from the transformation and reaction of alkylaromatics, those transformations being sterically inhibited within the restrictive dimensions of a 10-ring pore. © 1979.