Kinetics of ethanol hydrochlorination over γ-Al2O3 in a microstructured reactor. Reaction Kinetics Analysis of Ethanol Dehydrogenation Catalyzed by MgO–SiO2. The dehydration of alcohol series done by Thomke over BPO4, Ca3(PO4)2 and Sm2O3 determined the mechanism by 2 precise criteria, uptake of deuterium from deuterated catalysts into produced olefin and un-reacted alcohol. Your IP: 5.134.8.190 Journal of Industrial and Engineering Chemistry. Unlike OH group, protonated OH group is a good leaving group. Marks, and Peter C. Stair . O Gas-phase dehydration of tetrahydrofurfuryl alcohol to dihydropyran over γ-Al2O3. The mechanism of dehydration of alcohols over “acidic” and “nonacidic” alumina is the same. Mechanism of Dehydration of Phenols on Noble Metals via First-Principles Microkinetic Modeling. Deuterated alcohols show a primary kinetic isotope effect for unimolecular dehydration, implicating cleavage of a C-H bond (such as the Cβ-H bond) in the rate-determining step for olefin formation on γ-Al2O3. Copyright © 1966 Academic Press Inc. -Al The mechanism of dehydration of alcohols over “acidic” and “nonacidic” alumina is the same. The trans elimination reactions and the anchimeric assistance of alcohols over aluminas suggest that the dehydration must occur within either the submicroscopical pores, or crevices, or channels of the aluminas. 2-Propanol has the highest rate constant for unimolecular dehydration among studied alcohols, demonstrating that stability of the carbocation-like transition state is the primary factor in determining rates of unimolecular dehydration which concomitantly results in high selectivity to the olefin. Maxime Caillot, Alexandra Chaumonnot, Mathieu Digne, Jeroen A. 2 Nature and Catalytic Properties of In-Situ-Generated Brønsted Acid Sites on NaY. Yuchen Zhou, Zezhi Chen, Huijuan Gong, Lu Chen, Huiqiang Yu, Weili Wu. Get article recommendations from ACS based on references in your Mendeley library. 2:18 mins. Jurriaan Boon, Jasper van Kampen, Roelof Hoogendoorn, Stefania Tanase, Frans P.F. The amount of adsorbed pyridine estimated by in situ titration to completely inhibit ether formation on γ-Al2O3 shows that the number of sites available for bimolecular dehydration reactions is the same for different alcohols, irrespective of the carbon chain length and substitution. M. Murphy, Jingcheng Wu, Hong Je Cho, Juliana Soreo, Chenguang Wang, Longlong Ma. Jingbo Qi, Xianyong Sun, Si-Fu Tang, Yuanyuan Sun, Chen Xu, Xiaoyu Li, Xuebing Li. Morphology-dependent phase transformation of γ-Al2O3. Sustainable short-chain olefin production through simultaneous dehydration of mixtures of 1-butanol and ethanol over HZSM-5 and γ-Al2O3. J.N. Cooperativity between Al Sites Promotes Hydrogen Transfer and Carbon–Carbon Bond Formation upon Dimethyl Ether Activation on Alumina. ) Kinetics and Mechanism of Ethanol Dehydration on γ-Al2O3: The Critical Role of Dimer Inhibition. Barrera. The amount of adsorbed pyridine estimated by in situ titration to completely inhibit ether formation on γ-Al2O3 shows that the number of sites available for bimolecular dehydration reactions is the same for different alcohols, irrespective of the carbon chain length and substitution. Qiao-Ling Dai, Bo Yan, Yu Liang, Bo-Qing Xu. Glen R. Jenness, Matthew A. Christiansen, Stavros Caratzoulas, Dionisios G. Vlachos, and Raymond J. Gorte . Lesson 4 of 18 • 489 upvotes • 11:27 mins. Sachin Rana. Aimee B. Kellicutt, Roozbeh Salary, Omar Ali Abdelrahman, Jesse Q. 1. Pavlo Kostetskyy, Carly M. Nolan, Mudit Dixit. 2 De Los Reyes, T. Viveros, M. Valle-Orta, M.C. To submit Dehydration of Alcohols assignment click here. Shuxing Bai, Bingbing Shi, Wei Deng, Qiguang Dai, Xingyi Wang. Jonathan E. Sutton, Paraskevi Panagiotopoulou, Xenophon E. Verykios, and Dionisios G. Vlachos . Isobutanol has the lowest rate constant for bimolecular dehydration because of steric factors. Bimolecular dehydration does not show a kinetic isotope effect with deuterated alcohols, implying that C–O or Al–O bond cleavage is the rate-determining step for ether formation. In the presence of the “acidic” alumina, the readsorption of the dehydrated product can occur, leading to either double bond migration or skeletal isomerization, depending on the strength of the acid sites, the structure of the olefins produced, and the experimental conditions.
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