Abstract:
In this research, the performance of Cu-Mn-based mixed oxide catalysts with ZnO addition prepared by combustion synthesis for the low-temperature water gas shift reaction have been investigated. The characterization of catalyst was examined by BET XRD TEM TPR and FT-IR techniques. The experimental results showed that ZnO addition is an effective promoter for Cu-Mn catalyst. It was found by XRD analysis that the Cu-Mn-Zn catalysts are mainly composed of CuMn2O4 ZnMn2O4 CuO and ZnO phases. It was demonstrated by TPR that Cu-Mn-Zn catalysts shift the reduction peaks to lower temperature region. And all phases can reduce at the same temperature range. The reduced catalyst in 20% H2 in He balance with a Mn/Zn weight ratio of 1:0.5, Cu/(Cu+Mn+Zn) molar ratio of 0.15, urea/nitrate molar ratio of 4.17 expressed CO conversion of 69-72% and H2 yield of 61% in the temperature range of 270-300°C. In addition, the Cu-Mn-Zn catalyst showed higher performance than the Cu-Mn catalyst when containing oxygen in the feed. The stability of Cu-Mn-Zn catalyst was tested for 2880 minutes at 270 ºC.