Abstract
Holmium was used as a dopant to boost the low-temperature NH3-selective catalytic reduction (SCR) performance of Ce/TiO2 catalyst. It was ascertained that certain amount of Ho-doping species could exceedingly improve the low-temperature SCR activity under 60 000 h−1 of Ce/TiO2, accompanied with the improvement of tolerance to H2O and SO2 at 200°C. Characterization results manifested that Ho modification could not only result in inhibiting the growth of TiO2 crystals and the enlargement of specific surface area but also lead to the enhanced redox ability and the increased amount of surface-adsorbed substances, all of which could promote the low-temperature NH3-SCR performance of Ce/TiO2.
Highlights
NOx has become one of the significant sources of air pollution
A Ce– Ti oxide catalyst with Cu addition could promote the SO2 resistance of Ce–Ti oxide [17]. Several catalysts, such as V/CeTiO2 and Ce – Cu–TiO2, have been successfully applied in NH3-Selective catalytic reduction (SCR), enhanced low-temperature NH3-SCR performance and SO2 resistance of Ce/TiO2 modified by Ho have never been reported
All prepared catalysts showed high N2 selectivity in the temperature range of 100 – 3008C, Ce0.35/TiO2 added with Ho exhibited relatively better N2 selectivity above 3008C compared with Ce0.35/TiO2 catalyst
Summary
NOx has become one of the significant sources of air pollution. The over-standard concentration of NOx emission was mainly caused by the combustion process of fossil fuel, which has caused many environmental problems such as city smog and pollution [1,2,3,4]. A Ce– Ti oxide catalyst with Cu addition could promote the SO2 resistance of Ce–Ti oxide [17] Several catalysts, such as V/CeTiO2 and Ce – Cu–TiO2, have been successfully applied in NH3-SCR, enhanced low-temperature NH3-SCR performance and SO2 resistance of Ce/TiO2 modified by Ho have never been reported. Gamal et al [19] reported that the surface of Ho2O3 exposes more Lewis acid sites, which play a vital role in NH3-SCR reaction It was reported [20] that Ho-modified Fe– Mn/TiO2 catalyst shows a larger specific area of Fe2O3 phase compared with that of Fe – Mn/TiO2, which results in a board temperature window and high SO2 tolerance in NH3-SCR reaction. SO2 þ H2O tolerance of the best catalyst was studied
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