The cracking reactions of C6 paraffins (n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane and 2,3-dimethylbutane) over a fluidized catalytic cracking (FCC) catalyst at temperatures between 573 and 923 K have been studied in a temporal analysis of products (TAP) reactor. A mathematical model taking into account the extra- and intra-crystalline transport phenomena was used to describe the experimental data and allowed to determine the diffusion, sorption and intrinsic kinetic parameters for the hydrocarbons studied. These parameters are compared with published values obtained by independent methods. The sorption parameters increase with increasing branching in agreement with literature data while no variation of the diffusivity was observed. The activation energies for the overall disappearance of the C6 paraffins, containing contributions of dehydrogenation and C-C bond cleavage, vary only slightly with the degree of branching. The product distribution, however, varies greatly with the various isomers.