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• W2007220970 abstract "Abstract A series of manganese–cerium oxide catalysts were prepared by different methods and used for low-temperature selective catalytic reduction (SCR) of NO x with ammonia in the presence of excess O 2 . The Mn–Ce–O x catalysts showed high activities. The experimental results showed that the best Mn–Ce mixed-oxide catalyst yielded nearly 100% NO conversion at 120 °C at a high space velocity of 42,000 h −1 . As the manganese content was increased from zero to 30% (i.e., the molar ratio of Mn/(Mn+Ce)), NO conversion increased significantly, but decreased at higher manganese contents. The most active catalyst was obtained with a molar Mn/(Mn+Ce) ratio of 0.3. The effect of the calcination temperature was also investigated and the optimum calcination temperature was 650 °C. These catalysts are substantially more active than all other catalysts reported in the literature. SO 2 and H 2 O (at high concentrations) have slight effects on the SCR activity. From a steady-state kinetics study, it was found that the low-temperature SCR reaction was zero order with respect to NH 3 and first order with respect to NO. Compared with the other catalysts reported for low-temperature SCR of NO with ammonia, based on the first-order rate constants, the MnO x –CeO 2 catalyst was several times more active than other catalysts reported in the literature. Only N 2 rather than N 2 O was found in the product when the temperature was below 150 °C. At higher temperatures, trace amounts of N 2 O were detected." @default.
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• W2007220970 date "2003-07-01" @default.
• W2007220970 modified "2023-09-27" @default.
• W2007220970 title "Performance and kinetics study for low-temperature SCR of NO with NH3 over MnOx–CeO2 catalyst" @default.
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• W2007220970 doi "https://doi.org/10.1016/s0021-9517(03)00081-2" @default.
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