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In fact, as shown in Table 3, although the rate constant (k2) of the cis-to-trans isomerization reaction was higher than that of tetralin hydrogenation reaction (k1) the cis¨Ctrans isomerization on Pt and Ni catalysts was taken place when the concentration of tetralin on the surface was decreased . As discussed in previous study, the high adsorption constant of tetralin compared to that of decalin may be ascribed to the parallel adsorption of a more rigid aromatic-containing molecule than a bent naphthenic molecule
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