Abstract
A series of materials based on activated carbon (AC) with copper deposited in various amounts were prepared using an incipient wetness impregnation method and tested as catalysts for selective catalytic reduction of nitrogen oxides with ammonia. The samples were poisoned with SO2 and regenerated in order to analyze their susceptibility to deactivation by the harmful component of exhaust gas. NO conversion over the fresh catalyst doped with 10 wt.% of Cu reached 81% of NO conversion at 140 °C and about 90% in the temperature range of 260–300 °C. The rate of poisoning with SO2 was dependent on Cu loading, but in general, it lowered NO conversion due to the formation of (NH4)2SO4 deposits that blocked the active sites of the catalysts. After regeneration, the catalytic activity of the materials was restored and NO conversion exceeded 70% for all of the samples.
Highlights
Selective catalytic reduction (SCR) of nitrogen oxides with ammonia (NH3 -SCR) is one of the most efficient methods of the abatement of NOx emitted by stationary sources
X-ray diffraction (XRD) patterns of the fresh, poisoned and regenerated samples are presented in there are no reflections related to copper or copper oxide on the surface of the sample
Similar results was obtained by Tseng and Wey [34] who did not observe any XRD reflections for copper content lower than 3% as such very small crystals could not be detected by XRD
Summary
Selective catalytic reduction (SCR) of nitrogen oxides with ammonia (NH3 -SCR) is one of the most efficient methods of the abatement of NOx emitted by stationary sources. There is an urgent need for the novel catalyst to be made of environmentally friendly components and exhibit sufficient activity in the low temperature range (around 250 ◦ C or lower) to place it downstream of the desulphurization unit and electrostatic precipitator [8,9] Another harmful pollutant emitted to the atmosphere as the result of fuel burning is sulphur dioxide (SO2 ) [2,10,11]. Due to the presented interaction of SO2 with the surface of the commercial SCR catalyst and the formation of by-products during the process below 300 ◦ C, there is a high demand for the novel catalyst that would be active and resistant to poisoning in the low temperature range of the reaction. After exposure to SO2 , the catalysts were regenerated using thermal treatment and the NH3 -SCR reaction over these materials was repeated
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