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Experiments were conducted to evaluate the effect of adding ethanol amine during the preparation of a V/TiO 2 catalyst to remove nitrogen oxide (NO x ) by selective catalytic reduction (SCR). The catalyst added monoethanolamine (MEA) had the highest NO x conversion among all the neutralization reagents tested, and the optimum MEA concentration was determined to be 10%. The catalyst-added MEA had a large amount of lattice oxygen, which was determined in the O 2 on/off experiment. In addition, it also displayed a high reoxidation rate in the O 2 reoxidation experiment. In the XPS analysis, the superior redox properties of the catalyst-added MEA were shown to be caused by the presence of Ti +3 , a non-stoichiometric species.