A great deal of attention has been devoted in the last years to photocatalytic processes both in the homogeneous phase and in heterogeneous systems. Wastewater decontamination, solar energy conversion, and photoelectrochem. processes are main research targets in the field of photocatalysis. It is a fact that selectivity is a key issue in the catalysis of fine chems. prodn. To pursue this objective, all the steps of the oxidn. process must be optimized. On the basis of pure thermodn. considerations, most org. compds. are not stable with respect to oxidn. by O2. There are, however, kinetic limitations in this process which are mainly imposed by the triplet ground state of the O2 mol., which is not consistent with the singlet states of many org. substrates. In the following review , the authors show that activation of both O2 and the org. substrate may be achieved by photochem. excitation with light of the visible or of the near-UV regions (l > 300 nm). The authors attempt to summarize and classify the significant features of different organized systems able to induce photocatalytic hydrocarbon oxygenations. The reaction mechanisms and the catalyst stability in view of reuse in multiple catalytic cycles are discussed.
Photocatalysis with organized systems for the oxofunctionalization of hydrocarbons by O2
Amadelli R
2002
Abstract
A great deal of attention has been devoted in the last years to photocatalytic processes both in the homogeneous phase and in heterogeneous systems. Wastewater decontamination, solar energy conversion, and photoelectrochem. processes are main research targets in the field of photocatalysis. It is a fact that selectivity is a key issue in the catalysis of fine chems. prodn. To pursue this objective, all the steps of the oxidn. process must be optimized. On the basis of pure thermodn. considerations, most org. compds. are not stable with respect to oxidn. by O2. There are, however, kinetic limitations in this process which are mainly imposed by the triplet ground state of the O2 mol., which is not consistent with the singlet states of many org. substrates. In the following review , the authors show that activation of both O2 and the org. substrate may be achieved by photochem. excitation with light of the visible or of the near-UV regions (l > 300 nm). The authors attempt to summarize and classify the significant features of different organized systems able to induce photocatalytic hydrocarbon oxygenations. The reaction mechanisms and the catalyst stability in view of reuse in multiple catalytic cycles are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
