Taqui Khan, M. M. ; Chatterjee, Debabrata ; Krishnaratnam, M. ; Bala, Manju (1992) Photosensitized reduction of N2 by RuII(bipy)32+ adsorbed on the surface of Pt/TiO2/RuO2 semiconductor particulate system containing RuIII-EDTA complex and L-ascorbic acid Journal of Molecular Catalysis, 72 (1). pp. 13-18. ISSN 0304-5102
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0304-5102(92)80025-C
Abstract
Photocatalytic reduction of N2 to NH3 was carried out in a surface-modified semiconductor particulate system containing Pt/TiO2/RuO2 semiconductor powder, K[RuIII(EDTA-H)Cl]-(EDTA-H = anion of ethylenediaminetetracetic acid) complex as a catalyst and L-ascorbic acid as a sacrificial electron donor. The surface of the Pt/TiO2/RuO2 semiconductor was modified by adsorbing photoactive RuII(bipy)32+ complex. Illumination of the system containing N2, surface-modified semiconductor, RuIII-EDTA complex and ascorbic acid at the photoexcitation energy of RuII(bipy)32+ (510 nm) produces appreciable amounts of NH3 with a turnover rate of 1.13 mol NH3 per mol RuIII-EDTA complex per hour. An improvement in the rate of ammonia formation (1.67 mol h−1 per mol RuIII-EDTA complex) was observed when the same system was illuminated at the band gap energy of TiO2 (390 nm). A suitable mechanism involving the formation of an intermediate dinitrogen complex of ruthenium(II), (RuII(EDTA)N2−) was proposed for the photoreduction of N2 to NH3.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 57862 |
| Deposited On: | 30 Aug 2011 10:31 |
| Last Modified: | 30 Aug 2011 10:31 |
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