Catalytic reduction of nitric oxide over phthalocyanines of first transition metals |
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| Affiliation: | 1. Department of Inorganic and Analytical Chemistry, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland;2. Department of Chemical Technology of Drugs, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland;3. Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12, 61-704 Poznan, Poland;4. Rega Institute for Medical Research, KU Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium |
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| Abstract: | Catalytic activities of metal phthalocyanines for the reduction of nitric oxide with hydrogen were found to be in the order Mn < Fe < Co > Ni Cu > Zn. This order can be related to the number of d-electrons of the metal ions. Complexes of the first three metals adsorbed nitric oxide at 80 °C and produced molecular nitrogen as well as ammonia through the reduction of nitric oxide, whereas the others did not adsorb nitric oxide and formed ammonia almost exclusively. The activities of nickel and copper phthalocyanine were greatly increased by heat treatment at 340 °C. Catalytic activity and product distribution are discussed from the mechanistic viewpoint. |
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