Abstract
A set of exchanged Cu/SiO 2 and Cu Zn/SiO 2 solids were used as models of copper-based methanol synthesis catalysts. The conditions for the selective reduction of the supported Cu II ions into unsaturated Cu I species are given. A good correlation was established between methanol selectivity and catalyst stability under the reaction conditions and the concentration of Cu I species in the prereduced catalysts. The methanol selectivity and the catalyst stability are enhanced in the presence of unsaturated Zn 2+ cations. The effect of Zn 2+ ions is greater for Cu/ZnO than for Cu Zn/SiO 2 catalysts. Methanol selectivity and stability under the reaction conditions are greatly enhanced with a ZnO support. A model of the active sites is proposed.
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