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The liquid-phase catalytic hydrogenation of several styrene derivatives, PhCH=CHR (R = H, CH,OH, CHO, COMe, C02H, and CO,Me), has been carried out at 293-333 K with 0.41 MPa of initial hydrogen pressure on nickel catalysts at 20 wt% supported on A1,03, Si O,, and on t w o different types of AIPO,. The metal-support interaction effects as well as the substituent effects can be evaluated through several isokinetic parameters obtained due t o the existence of a linear correlation between the activation parameters AHt and ASt (and between I n A and E,) known as the

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