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In this work, cerium–tungsten oxide catalysts were prepared by three methods: single step sol–gel (SG), impregnation (IM), and solid processing (SP). The catalysts were used for selective catalytic reduction (SCR) of NO x with ammonia over a wide temperature range. The results indicated that the catalysts prepared by the SP and IM methods exhibited better SCR activity than that prepared via...
γ-Fe2O3 catalyst showed higher catalytic activity than α-Fe2O3 in 150–300 °C. Both NH3 and NOx species adsorbed and reacted easily on γ-Fe2O3. However, NH3 adsorbed on α-Fe2O3 and then reacted with gaseous NOx. Gaseous NOx was more easily adsorbed on α-Fe2O3 than gaseous NH3, consequently, stable nitrates formed and blocked the active sites, which affected the SCR reaction badly. Graphical...
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