Metalloporphyrin-catalyzed hydrogenation of α,β-unsaturated esters
1992; Science Press; Volume: 75; Issue: 2 Linguagem: Inglês
10.1016/0304-5102(92)80108-s
ISSN1873-3131
AutoresShigeyoshi Sakaki, Takahito Sagara, Toru Arai, Tatsuya Kojima, T. OGATA, Katsutoshi Ohkubo,
Tópico(s)Electrocatalysts for Energy Conversion
ResumoThe hydrogenation of polycyclic aromatic hydrocarbons (PAHs) (naphthalene, anthracene, and phenanthrene) catalyzed by metalloporphyrins based on cobalt, nickel or iron was studied in aqueous solutions at room temperature and ambient pressure. Nickel porphyrin (P1) activated by nanosized zero-valent iron (nano-ZVI) and cobalt porphyrins (P2) and (P4) activated by titanium(III) citrate as the electron donor were demonstrated to be promising catalysts for the reductive hydrogenation of PAHs. In particular, partially saturated di-, tetra-, and octahydrogenated products were obtained for anthracene or phenanthrene using a nickel porphyrin activated by nano-ZVI, while naphthalene was transformed to tetralin. Systems containing cobalt porphyrins activated by titanium(III) citrate exhibited a high selectivity and activity toward hydrogenation of anthracene, producing 9,10-dihydroanthracene. However, no formation of hydrogenated hydrocarbons was observed from naphthalene or phenanthrene using cobalt porphyrins.
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