The diffusion rates
of feedstocks and intermediate products in
fluid catalytic cracking (FCC) catalysts have relevance for the product
selectivities obtained from the conversion of feedstocks in the FCC
process. A simple and robust method was developed to determine the
diffusion of probe molecules in such catalysts by means of inverse
gas chromatography. This procedure is described in detail, and its
relevance in FCC is illustrated by several examples. It is shown that
catalytic properties of FCC catalysts can be rationalized with the
diffusion coefficient parameter in cases where traditional analytical
tools (nitrogen sorption and X-ray diffraction) reach their limits.
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