to access the full features of the site or access our. © 2020 Elsevier B.V. All rights reserved. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea. Go to our The catalyst sample was pre-treated in situ in flowing Ar(50 mL/minat 200) ℃ for 1 h prior to ethanol dehydration. Samples characterized by similar Si/Al ratios in the range between 23 and 36 were chosen to ensure the ability to properly monitor the changes in catalytic performance related to the concentration of acid sites, as well as their accessibility and strength. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Dehydration of ethanol was carried out in a fixed bed quartz reactor system at atmospheric pressure in the temperature range starting from 100 to 400 °C. The catalytic activity of novel micro/mesoporous ZSM-5 in the dehydration process of alcohols has been studied with respect to their acidity and porosity. Copyright © 2004 Elsevier Inc. All rights reserved. to reproduce figures, diagrams etc. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Catalytic activity. Catalytic dehydration of ethanol over hierarchical ZSM-5 zeolites: studies of their acidity and porosity properties† Karolina A. Tarach ,* a Justyna Tekla , a Wacław Makowski , a Urszula Filek , b Kinga Mlekodaj , a Vladimir Girman , c Minkee Choi d and Kinga Góra-Marek * a In all cases the Ref. The catalysts were prepared by the modified sol-gel method with various alumina content ranging from 20 to 80 mol%. You do not have JavaScript enabled. Using bioethanol showed higher ethylene selectivity and less coke decomposition. Information about reproducing material from RSC articles with different licences do not need to formally request permission to reproduce material contained in this 2.3. Al-SSP catalysts were identified in large aggregates between silica and alumina. article provided that the correct acknowledgement is given with the reproduced material. The reactant was dosed (liquid-hour-space-velocity equal to 2.85 h −1) in a Pyrex glass reactor packed with 10 ml of the tested sample in the presence of a hydrogen stream (flow rate 75 ml/min). Reproduced material should be attributed as follows: If the material has been adapted instead of reproduced from the original RSC publication Corresponding authors, a The catalysts were prepared by the modified sol-gel method with various alumina content ranging from 20 to 80 mol%. The results obtained indicated that the dehydration reaction on the catalyst relies on surface acidity, whereas the ethylene production selectivity depends on the catalyst chemical constituents. Russian Journal of Applied Chemistry 2017 , 90 (2) , 169-178. The acids aren't written into the equation because they serve as catalysts., The strength and concentration of solid-acid sites are the main driving factors in the low-temperature dehydration of ethanol-to-ethylene. This may take some time to load. Concentrated phosphoric(V) acid, H3PO4, can be used instead. The dehydration of ethanol (EDWIC, assay >99%) was carried out in a catalytic-flow-type system operated under atmospheric pressure. with the reproduced material. The physicochemical properties of these catalysts were investigated via X-ray powder diffraction (XRD), acidity measurement, and nitrogen adsorption–desorption at −196 °C. By continuing you agree to the use of cookies. For ethanol dehydration under mild reaction conditions, the overall catalytic efficiency of Rho is superior to that of the ZSM-5 zeolite and the γ-Al 2 O 3 materials.


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