화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.95, 156-169, March, 2021
DOI10.1016/j.jiec.2020.12.014  Export Citation
Effect of surface acidity-basicity balance in modified ZnxZryOz catalyst on its performance in the conversion of hydrous ethanol to hydrocarbons
Hen Ohayon Dahan, Miron V. Landau†, and Moti Herskowitz
  • Chemical Engineering Department, Blechner Center for Industrial Catalysis and Process Development, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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ZnxZryOz and modified MuZnxZryOz (M = Si, W, Sc, Mg)/ Zn/(W-Zr) catalysts were studied in conversion of hydrous (4 wt% H2O) ethanol at P =15 bar, T = 450 °C and WHSV = 0.8-7.9 h-1. The basicity of the catalysts changed from 0.015 to 0.66 mmol/g and the acidity from 0.07 to 0.24 mmol/g resulting in a wide range of basicity/acidity ratio (R) of 1.3 to 7.3. Measurements of the catalysts activity, selectivity and stability indicate a strong dependency on the R-value. The yield of organic liquid C5-C11 increased from 17 wt% to 59 wt% while the yield of light olefins C2-C4 decreased from 60 wt% to 14 wt%, as R increased from 1.3 to 7.3. 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 stable up to 360 h on stream, while the activity and selectivity of MguZnxZryOz and WuZnxZryOz altered after 90 h on stream due to coke deposition blocking the acid and basic sites. It was proposed a comprehensive scheme of ethanol transformations routes consistent with the measured effects of the residence time, catalysts R-value and time on stream on the products distribution.
Keywords:acidity-basicity balance;ethanol conversion;heterogeneous catalysis;Zinc-Zirconia catalyst
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