Effect of Alkali Precipitateing Agent on the Activity and Stability of Copper-Manganese Mixed-Oxides for the Water Gas Shift Reaction

Ke Duan Zhi; Quan Sheng Liu; Run Xia He; Li Yang; Ya Gang Zhang; Fang Wu

doi:10.4028/www.scientific.net/AMR.634-638.508

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Effect of Alkali Precipitateing Agent on the Activity and Stability of Copper-Manganese Mixed-Oxides for the Water Gas Shift Reaction

Abstract:

This paper reports the effect of alkali precipitating agents, i.e. KOH and NaOH, on activity and stability of Cu-Mn based catalysts for the water gas shift (WGS) reaction. Structural and texture characteristics of the catalysts were characterized by low temperature N2 adsorption, X-Ray Diffraction (XRD) and TPR techniques. The XRD and low temperature N2 adsorption results showed the two types of precipitators produced different Cu-Mn phases during precipitation and drying. The KOH precipitator resulted in partial precipitation of copper ion and formation of hydrate basic copper sulfate, Cu₄SO₄(OH)₆•H₂O after drying; while the NaOH precipitator led to a completed precipitation of Cu ion and formation of relatively stable Cu₂₊₁O and Mn₃O₄ crystals after drying. These phases formed after precipitation by the KOH and NaOH, however, experienced the same phase change during calcination and activation, namely, they first changed to Cu₁_.₅Mn₁_.₅O₄ in calcination followed by the formation of microcrystalline Cu and MnO phases during activation. The Cu-Mn WGS catalysts prepared by the NaOH was found to have larger surface area and more content of Cu and MnO phases after activation, which might be the reasons of higher activity and better stability of the Cu-Mn catalyst.