| Autor: |
M. Krishnaratnam, Debabrata Chatterjee, Manju Bala, M.M.Taqui Khan |
| Rok vydání: |
1992 |
| Předmět: |
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| Zdroj: |
Journal of Molecular Catalysis. 72:13-18 |
| ISSN: |
0304-5102 |
| DOI: |
10.1016/0304-5102(92)80025-c |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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