A new process of isobaric hydrogenation of benzene and two catalysts were developed. The process is practicable only if a low-activity, selective, and high-S-absorption catalyst is used at Step I of benzene hydrogenation. No existing com. catalyst is suitable. New Ni-Cu catalysts were developed, which are believed to enable Step I temps. to be raised to 260-270 degrees C. Simulations gave catalysts temps. and reactant and product concns. vs. catalyst bed length. Reactor was sized and charged as that used in the CYCLOPOL process. The isobaric process uses less steam (no evapn. of cyclohexane-benzene before Step II), less reactants, a cheaper catalyst, possibly a smaller reactor, and it yields a purer cyclohexane and a higher-pressure steam as compared with the existing process.