Abstract
Ca salts in fly ash have a deactivation effect on SCR catalyst. In this study, the deactivation mechanism of Ca on Ce/TiO2 catalyst was investigated in term of the in situ DRIFT study. The experimental results indicate that the poisoning effect increases with reaction temperature. From the results of in situ DRIFT study, it may be concluded that the NH3-SCR reaction over Ce/TiO2 catalyst takes place though two pathways: the L-H mechanisms (<200 °C) and the E-R mechanism (>200 °C). For Ce/TiO2-Ca, the NH3-SCR reaction over it is mainly controlled by L-H mechanism. The deactivation of Ce/TiO2-Ca lies in the following two aspects: (1) the inhibited NH3 adsorption and NO oxidation (<200 °C); (2) the greatly suppressed NH3 adsorption and activation (>200 °C).
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