Using γ-Al2O3 as a support

a multiple-metal （Ni-Cu-Mn-K/Al2O3）catalyst for high- temperature water gas shift reaction was prepared by an equivalent-volumetric two-step impregnation method.Preparation parameters and reduction conditions were determined by TG

DTA and TPR characterization techniques.The results showed that

when loading ratio (Ni∶Cu∶Mn)

impregnation time

and calcination temperature were 2∶1.5∶1

300 min and 400℃ for the first-step impregnation respectively

loading of K+ was 5% in the second step impregnation

and reduction temperature was 400℃ and a proper amount of steam was added

the catalyst prepared in this work showed excellent catalytic performance and thermal stability

as compared with the existing commercial catalysts.Meanwhile

the ammonium-nitrogen wastewater produced with conventional preparation methods was eliminated with the eqivalent-volumetic impregnation method proposed in this work.