Carbon Dioxide Chemistry. Environmental Issues by J.P. Pradier and C.M. Pradier (Eds.)

By J.P. Pradier and C.M. Pradier (Eds.)

This publication derives from a workshop held in Sweden to envision the environmental implications of the dramatic elevate in carbon dioxide degrees within the surroundings within the final 50 years and to discover methods of mitigating greenhouse gasoline emissions. This multi-disciplinary process makes it crucial analyzing not just for chemists yet for all engineers, biologists and environmentalists taken with this crucially vital factor

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Schematic potential energy diagram of the system C 0 and C 0 " . 2 2 The ground state of the C 0 system is shown at the back representing the linear system with an enthalpy of formation of 393 kcal/mol . e. 5 eV higher than for linear C 0 . This value corresponds to the adiabatic electron affinity of C 0 in contrast of the vertical electron affinity which is considerably higher. 4 eV) ! C0 " can be experimentally observed in the gas phase after thermal decomposition of solid oxalates . Therefore the vibrational spectrum is known and can be used in comparison to linear C 0 as a fingerprint to identify the C 0 ' species.

Photocatalytic reaction between H 0 and C 0 to produce organic compounds is probably the most interesting and challenging reaction in artificial photosynthesis . T i 0 is one of the most active catalyst for this reaction 2 2 2 2 2 1S 2 15 It is known that titania is an n-type semiconductor. This electric conductivity can be increased by several orders of magnitude when higher valent cations, W , are incorporated in its lattice. This change can also alter properties of titania as a support for a metal, since the extent of the electronic interaction at the metal/support interface will be different .

Characteristic results for different samples are shown in Table 1. 2 2 3 2 2 3 2 3 The fact that an increase in the electron concentration in T i 0 enhanced the rate of photolysis may suggest that the predominant step in the photocatalytic reaction is the generation of photoelectrons and formation of the radical anion C0 ": 2 2 e' + C 0 2 - C0 " (4) 2 Further steps involve the protonation of C0 * by H 0 and additional electron transfer to give HCOOH. This is followed by further reduction to HCHO.

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