Reduction of NOx with NH3 in presence of pyrolysed macro-cycle catalyst

• Reduction of NOx with NH3 in the presence of pyrolyzed cobalt-tetraphenylporphyrin, CoTPP 'macro-cycle black', was studied. Active carbon, Norit RBXS 1, was used as a carrier. The experimental conditions were varied as follows: temperature from 95 to 140°C, space velocity of the gas mixture 1000-5000 h-1 and catalyst content 0-1%. The results showed that, in the experimental range studied, the temperature has no significant effect on the conversion of NOx. The conversion of NOx at low space velocity of the gas (1000 h-1) was high (approx. 90%), both in the presence and absence of CoTPP black. This was explained by the fact that the active carbon used as a catalyst support also has a catalytic effect on the reduction of NOx. At low space velocity this effect is sufficient to achieve high conversion of NOx in the presence of active carbon only. The conversion decreased at higher space velocity, however. The presence of CoTPP black counteracted the negative effect of the increased space velocity. The effect of the 'macro-cycle black' on the conversion of NOx was significant at higher space velocitites.

Nyckelord

Ammonia--Applications

Carbon--Activated

Catalysts--Activity

Catalysts--Organometallics

Organometallics--Pyrolysis

Active Carbon Catalyst Supports

Catalytic Nitrogen Oxide Reduction

Nitrogen Oxide Conversion Efficiency

Pyrolyzed Macrocycle Catalysts

Supported Organocobalt Catalysts

Nitrogen Oxides

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