首页|Effect of catalyst surface chemistry and metal promotion on the liquid-phase ethanol condensation to higher alcohols
Effect of catalyst surface chemistry and metal promotion on the liquid-phase ethanol condensation to higher alcohols
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NSTL
The production of higher alcohols(C4+)via ethanol liquid-phase condensation is studied in this work,screening catalysts with different acid/base properties,observing similarities but also relevant differences with respect to gas-phase reactions in the gas phase.The mechanistic analysis demonstrates the relevance of acidity,mainly to promote the dehydrogenation steps.In the same way,side reactions and hydrogenations have less relevance than in gas-phase,promoting the condensations and,subsequently,obtaining heavy compounds.The highest alcohol selectivity is reached with MgAl(2/1),with more than 79% of C4+ selectivity,but the activity of this material is conditioned by the low conversion obtained.The presence of water reduces the activity because of a competitive adsorption on the catalytic sites whereas the activity increases significantly when using bifunctional catalysts.The best results,obtained with 1% Cu/MgAl(2/1),allow rising the conversion up to more than 460% respect to the parent mixed oxide,with almost 44% of the alcohol mixture enriched in heavy compounds,mainly C6 and C8.
NSTL
