Effect of Zr addition on catalytic performance of Cu-Zn-Al oxides for CO₂ hydrogenation to methanol

Abstract

A series of 50%CuO-25%ZnO-25%Al(Zr) oxide catalysts was synthesized by a reverse co-precipitation method and characterized by XRD, N₂ adsorption-desorption, H₂-TPR, H₂-TPD and CO₂-TPD, and used as catalyst for CO₂ hydrogenation to methanol under mild conditions(200―260 °C and 1―3 MPa). Consequently, H₂-TPR ex-hibited that the dispersed CuO species increased with the zirconium content, while the H₂-TPD showed that small amount of zirconia can increase the H₂ desorption amount. As a result, Cat-2 and Cat-3 exhibited an enhanced H₂-spillover effect, the most H₂ desorption amount, which showed an optimum activity of about 7% methanol yield.

Keywords

Carbon dioxide / Reverse co-precipitation / Methanol / Catalytic hydrogenation / Copper based catalyst

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