Rh-ions and Rh-complexes intercalated in γ-titanium or γ-zirconium hydrogen phosphate as highly efficient catalysts for arene hydrogenation

摘要: Abstract Monocyclic arenes (C 6 H 5 X, X = H, CH 3 , OH, OCH Cl) are efficiently hydrogenated to their corresponding aliphatic hydrocarbons under relatively mild condition ( T  = 393 K, p 2  = 1–4 MPa) using rhodium(III) (Rh(III)) ions or Rh(III) N ′-complexes ′ = 2,2′-bipyridyl, 1,10-phenanthroline) intercalated into γ-titanium zirconium hydrogen phosphate, (γ-M(PO 4 )(H PO ); M = Ti, Zr), acting as ionic exchange supports. The hydrogenation rate depends on the catalyst, substrate and molar ratio, temperature pressure. Zirconium materials charged with naked Rh-ions, γ-Zr(PO ) x Rh y Rh-complexes, (Rh-L) (L = 2,2′-bipyridyl; 1,10-phenanthroline), proved be more active than titanium analogous compounds γ-Ti(PO . For both series of M (PO catalysts, (M = Ti, system. most influence pressure turnover frequency (TOF) stability over recycling was studied in benzene hydrogenation. activity increases at 4 MPa a TOF 4019 h −1 expressed mol per hour, found, Rh/benzene ratio 1/8045. catalysts remained stable for six runs case hydrogenation, while toluene, loss observed after third cycle. high Rh-zirconium used is also evidentiated by fact that, 2 MPa 1/30171, 975.3 mmol were 11 h, number (TON) 43538 mol Rh.