Title: Effects of H_2O and SO_2 on Mn-Fe/MPS Catalyst for NO Reduction by NH_3 at Lower Temperatures
Abstract: A catalyst of iron manganese oxides supported on mesoporous silica (MPS), Mn-Fe/MPS, was prepared and applied for selective catalytic reduction (SCR) of NO with ammonia in the presence of excessive oxygen at low temperatures. The effects of H2O and SO2 on the catalyst were studied. The results showed that a 99.1% NO conversion rate at 433 K at a space velocity of 20000 h-1 was achieved with the catalyst. H2O (10%, ) had not negative impact on the activity when the SCR reaction temperature was above 413 K and the NO SCR conversion rate could exceed 97.8%. A 97.2% NO conversion rate at 443 K in the presence of low concentration of SO2 (100×10-6) was obtained with the catalyst. In addition, as the SCR reaction proceeded in the presence of H2O and SO2, the catalyst was deactivated gradually, but its activity could almost be recovered to the initial level after heat treatment at 773 K, and the FT-IR spectra showed that the ammonium sulfate formed during SCR reaction in the presence of the H2O and SO2. Improving the SCR temperature could slow down the deactivation of catalyst. The effect of heat treatment temperature on the deactivated catalyst was also studied, and the recovery mechanism of the catalyst discussed. The prepared catalyst is substantially superior to any other reported catalysts in the literature in terms of integrated performance.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 3
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