Abstract
Catalytic reduction of nitric oxide with molecular hydrogen proceeded over metallo-tetraphenylporphyrins in the temperature range 200 – 350 °C in a circulating reactor. The activity order of the complexes was FeClTPP ≪ CoTPP ⩽ NiTPP ≫ CuTPP > ZnTPP, indicating the strong influence of central metal ions. CoTPP which adsorbed nitric oxide produced molecular nitrogen and nitrous oxide as well as ammonia, whereas Ni, Cu, and ZnTPP which do not stationarily adsorb nitric oxide, produced ammonia selectively. The reducing reactivities of carbon monoxide, ammonia, and methane were examined over CoTPP. The reactivities of these reducing agents were H 2 > CO > NH 3 > CH 4. Ammonia was found to enhance the adsorption of nitric oxide over CoTPP. The catalytic reaction is discussed in terms of the correlation between the electronic structure of the metalporphyrins and their activity for the adsorption and reduction of nitric oxide.
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