Abstract

Catalytic pollution abatement using naturally local materials

Author(s): T.Zaki, M.Riad, L.Saad, S.Mikhail

The catalytic conversion of the main pollutants in the exhausted gas carbon monoxide and nitric oxide to environmental friendly gas was carried out using iron and manganese ore samples. The ores have been characterized through X-ray and differential scanning calorimetry analyses. Tests for the carbonmonoxide oxidationwere performed in a catalytic flow system, operated under atmospheric pressure, at constant response time sixty minutes, inlet carbon monoxide 270ppm and with stepwise increase of reaction temperature from 100 to 500ºC. The effect of carbon monoxide inlet concentration was also tested for higher concentrations, i.e. up to 23300ppm. Finally, to distinct the difference between the endurance ability of the most active materials, the effect of carbon monoxide inlet concentration factor, was tested. The toleration capabilities of the samples were compared at experimentally vigorous conditions; i.e. the inlet carbon monoxide concentration reached 90,000ppm. The reduction of nitric oxide (25ppm) in the presence of carbon monoxide (25ppm) and air was investigated in a catalytic flow system actuated in reaction temperature ranged from100 to 500ºC and time of stream sixty minutes. Moreover the influence of nitric oxide inlet concentration on thematerial activity tested. Results revealed that iron ore samples have high catalytic efficiency. In some cases, the iron ore sample, which contains relatively high iron content, is being to be more active towards both oxidation of carbon monoxide and reduction of nitric oxide.