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The hydrosoluble complex [Rh(μ-Pz)(CO)(TPPMS)] 2 , Pz = pyrazolate ligand, and TPPMS = (C 6 H 5 ) 2 P(C 6 H 4 SO 3 Na) was used as catalytic precursor in the two phase hydrogenation reaction of the individual olefins (1-hexene, styrene, cyclohexene and 2,3-dimethyl-1-butene) to give the main expected saturated products. Under the best operational conditions (80 °C, 200 psi H 2 , S/C 535/1, and 600 rpm), the substrates showed the following hydrogenation reactivity order: 1-hexene > styrene > cyclohexene > 2,3-dimethyl-1-butene. The quaternary equimolar mixture of olefin and an olefin mixture that simulates a real composition of olefin present in a naphtha showed a different hydrogenation order; styrene > 1-hexene > cyclohexene > 2,3-dimethyl-1-butene. The catalyst can be recycled without significant loss of activity and showed sulfur tolerance, demonstrated by using benzothiophene in the olefin mixtures. |
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