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Hen Ohayon Dahan,Miron V. Landau,Moti Herskowitz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
ZnxZryOz and modified MuZnxZryOz (M = Si, W, Sc, Mg)/ Zn/(W-Zr) catalysts were studied in conversion ofhydrous (4 wt% H2O) ethanol at P =15 bar, T = 450 C and WHSV = 0.8-7.9 h-1. The basicity of the catalystschanged from 0.015 to 0.66 mmol/g and the acidity from 0.07 to 0.24 mmol/g resulting in a wide range ofbasicity/acidity ratio (R) of 1.3 to 7.3. Measurements of the catalysts activity, selectivity and stabilityindicate a strong dependency on the R-value. The yield of organic liquid C5-C11 increased from 17 wt% to59 wt% while the yield of light olefins C2-C4 decreased from 60 wt% to 14 wt%, as R increased from 1.3 to7.3. The content of C5-C11 iso-olefins and aromatics in organic liquid on ZnxZryOz (R = 3.9), WuZnxZryOz(R = 2.0) and MguZnxZryOz (R = 7.3) increased significantly with the residence time. ZnxZryOz was stableup to 360 h on stream, while the activity and selectivity of MguZnxZryOz and WuZnxZryOz altered after90 h on stream due to coke deposition blocking the acid and basic sites. It was proposed a comprehensivescheme of ethanol transformations routes consistent with the measured effects of the residence time,catalysts R-value and time on stream on the products distribution.