The role of cobalt in C1-C3 alcohols synthesis from syngas over Cu-Zn-Al catalyst
Abstract
In this work 15% Cu supported on ZnO-Al2O3 and promoted by 5%Co, has been prepared by impregnation method and tested for methanol and higher alcohol synthesis from syngas. The catalytic samples have been characterized using BET, XRD, TEM, TPR-H2 techniques. TPR-H2 technique reveals that Co addition to 15% Cu supported on ZnO-Al2O3 catalyst promotes the reducibility of Cu. The experimental results show that unpromoted, 15% Cu supported on ZnO-Al2O3 exhibits a moderate activity for CO conversion with methanol as the main product. The Co promoter plays an essential role in directing the selectivity to mixture of methanol and propanol. Both the CO conversion and the selectivity for methanol and propanol over 15Cu5Co/ZnO-Al2O3 increases and much higher than those over 15Cu/ZnO-Al2O3. The suitable conditions for producing higher alcohols from syngas (mole ratio of H2 and CO is equal to 3:1) using total flow rate of 20 ml/min are determined as 350oC at atmospheric environment.
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