Abstract
A series of the CoZn catalysts supported on MnAl oxide with different Co/Zn molar ratios were synthesized according to the sol–gel method and used for higher alcohol synthesis from syngas. The chemical and physical properties of the as-synthesized catalysts were investigated by various characterization methods such as XRD, H2-TPR, N2 adsorption and desorption, CO2-TPD, CO-TPD, DRIFTS, H2-TPD, TEM, XPS, and CO-TPSR. The results indicated that CO conversion and alcohol selectivity changed depending upon the Co/Zn molar ratio that significantly influenced the properties of the as-synthesized catalysts. The proper Co/Zn molar ratio can increase the concentration of moderate/strong basic sites, improve the amount of non-dissociated CO on the catalyst surface for CO insertion, and enhance the catalytic performance for higher alcohol synthesis. In particular, the 4Co4Zn catalyst shows the highest selectivity to higher alcohols (80%) among all the catalysts.
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