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Katrin Fridriks

how is acetone obtained from ethanol

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how is acetone obtained from ethanol

We use cookies to help provide and enhance our service and tailor content and ads. 3. Taking Roxyg and Rolef values (Table 1) into account and employing ZrO2 as catalyst, it can be said that when 1 mol of ethanol reacts 54% is transformed into ethylene and the remaining 46% into oxygenated compounds. The fragments of H2, ethylene, CO2 acetaldehyde, ethanol (m/z = 2, 26, 44, 29 e 31, respectively) and acetone (m/z = 43, 58, 60) were continuously monitored. Please check your email for instructions on resetting your password. J Catal 212:207–215, Carvalho DL, De Avillez RR, Rodrigues MT, Borges LEP, Appel LG (2012) Mg and Al mixed oxides and the synthesis of n-butanol from ethanol. Acetone is an important solvent and widely used in the synthesis of drugs and polymers. Comparing the TPSR spectra of Fig. Thus, the acid and basic properties of the catalysts are relevant properties for the synthesis of this ketone from ethanol. According to Phatak et al. Thus, ZrO2 shows lower selectivity to acetone when compared with CeZr not only due to its higher acidity, but also owing to its lower vacancies concentration. statement and The presence of strong acid sites should not occur as they promote the dehydration reaction. Table 1 depicts that ZrO2 shows a higher ethylene generation rate than CeZr. Moreover, CeZr dissociates H2O, which reoxidizes this oxide. Part of 4. Moreover, the proposed mechanism suggests oxi-reduction steps and employs H2O as an oxidant agent. Chen et al. 2) and its catalytic behavior compared with the one of its physical mixture, it can be suggested that the dissociation of H2O on CZA generates O species which show mobility and promote the redox behavior of ZrO2, as proposed by Rodrigues et al. Acetone is an important solvent and widely used in the synthesis of drugs and polymers. At this temperature, the concentration of carboxylates on the surface is lower and they do not hinder the H2O decomposition. The particle size of the catalyst and oxides was smaller than 0.053 mm. Nakajima et al. 152:201–212, Yee A, Morrison SJ, Idriss H (1999) A study of the reactions of ethanol on CeO2 and Pd/CeO2 by steady state reactions, temperature programmed desorption, and in situ FT-IR. Three catalysts were employed in this work. J Mater Chem 4:853–858, Nakajima T, Yamaguchi T, Tanabe K (1987) Efficient synthesis of acetone from ethanol over ZnO–CaO catalyst. Surely, the understanding of the acetone synthesis will support future developments related to these subjects. Copyright © 2020 Elsevier B.V. or its licensors or contributors. In short, firstly, the O (oxide) of interface metal-reducible oxidizes CO to CO2. J Catal 302:20–30, Goguet A, Meunier FC, Tibiletti D, Breen JP, Burch R (2004) Spectrokinetic investigation of reverse water-gas-shift reaction intermediates over a Pt/CeO2 catalyst. As is well known, the acetaldehyde generation is the first step of the acetone synthesis. This might occur due to the lower amount of ethanol adsorbed on CZA when it is compared with CeZr, which is probably related to the lower density of acid sites of the Cu-based catalyst. hexane/ethanol/acetone and absorbance measurement at 503 nm. Manage cookies/Do not sell my data we use in the preference centre. The E2 mechanism is related to the simultaneous abstraction of OH and β-H by a pair of acid and basic sites. The basic sites, which are assigned as weak, are related to a curve which shows a maximum at a temperature lower than 443 K; the ones between 443 and 543 K, medium; and finally, the ones above 543 K, strong basic sites. The consumption of H2 was monitored by a thermal conductivity detector (TCD) and the TPR profiles were normalized by the samples weight and H2 signal intensity. 52:237–248, CAS  6). Initially, ethoxide species are generated. Li HG(1), Luo W, Gu QY, Wang Q, Hu WJ, Yu XB. The nanoparticles obtained with all three studied solvents were moderately electrostatically stable. Cite this article. J Chem Soc Chem Commun  394–395. Appl Catal A 415–416:96–100, Article  The first peak of H2 (610 K) occurs at a higher temperature than the ones of acetone/CO2 (547 K), suggesting that H2O is able to oxidize effectively the catalytic surface only when some carboxylate species react, i.e., acetone and CO2 are desorbed. The first step of the acetone synthesis is the acetaldehyde generation. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. The definition of the selectivity to one specific compound is the ratio of the number of C mol consumed to synthesize this compound to the total number of C mol consumed.

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