Selective catalytic reduction of NOx by NH3 over MoO3-promoted CeO2/TiO2 catalyst

• MoO3–CeO2/TiO2 is more active than CeO2/TiO2 for the NH3-SCR of NOx.
• The added MoO3 inhibits the adsorption of H2O and SO2 and the formation of sulfate.
• The adsorption and activation of NH3 was promoted due to the added MoO3.

The addition of MoO3 enhanced the activity of CeO2/TiO2 catalyst for the selective reduction of NOx with NH3. The MoO3-promoted CeO2/TiO2 exhibited higher activity than CeO2/TiO2 even in the co-presence of H2O and SO2. This is because the introduction of Mo to the Ce10Ti catalyst can inhibit the adsorption of H2O and SO2 as well as the formation of sulfate species on the catalyst surface, thus alleviating the poisoning effect of H2O and SO2.

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