Topic
Acetone
About: Acetone is a research topic. Over the lifetime, 9458 publications have been published within this topic receiving 120867 citations. The topic is also known as: propanone & dimethylketone.
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TL;DR: In this article, a reaction network detailing the formation and consumption of all C1-C3 products of propylene oxidation on Bi2Mo3O12 at 623 K is developed to show that acrolein, acetaldehyde, acetone, acrylic acid, and acetic acid are direct oxidation products of polypropylene while acrylic acid and ethylene are secondary products.
Abstract: A reaction network detailing the formation and consumption of all C1–C3 products of propylene oxidation on Bi2Mo3O12 at 623 K is developed to show that acrolein, acetaldehyde, acetone, and acetic acid are direct oxidation products of propylene while acrylic acid and ethylene are secondary products. Coprocessing acetaldehyde, acetone, acrylic acid, and acetic acid, separately, with propylene, oxygen, and water revealed (i) the existence of overoxidation reactions of acrolein to acrylic acid and ethylene and oxidation pathways from acetone to acetaldehyde and acetic acid, (ii) the promotional effects of water on the synthesis rates of acetaldehyde from acrolein, acetone from propylene, and acetic acid from acetaldehyde and acrylic acid, and (iii) the inhibitory effects of water on the decomposition of acetic acid to COx and acrylic acid to acetaldehyde and ethylene. A kinetic model is developed to quantitatively capture the kinetic behavior of all species using pseudo-first-order rate expressions in the org...
47 citations
TL;DR: In this article, the coexistence curves of the binary fluid mixture methanol-cyclohexane with increasing amounts of acetone impurity were measured and linear changes in the critical temperature and critical concentration were observed.
Abstract: Measurements on the coexistence curves of the binary fluid mixture methanol–cyclohexane with increasing amounts of acetone impurity showed essentially linear changes in the critical temperature and critical concentration with impurity. Adding 1.0% acetone impurity caused the critical temperature to decrease by 3.4 K, the effective critical exponent β to increase and the critical concentration, as measured by volume fraction methanol, to decrease by 0.005.
47 citations
47 citations
TL;DR: The Cu-β is found to have a considerable selectivity towards the production of isobutene from acetone (over 31% yield compared to 7.5% of the protonic zeolite), and different reactions mechanisms are proposed in order to explain the final product distributions.
Abstract: Various metal-β zeolites have been synthesized under similar ion-exchange conditions. During the exchange process, the nature and acid strength of the used cations modified the composition and textural properties as well as the Bronsted and Lewis acidity of the final materials. Zeolites exchanged with divalent cations showed a clear decrease of their surface Bronsted acidity and an increase of their Lewis acidity. All materials were active as catalysts for the transformation of acetone into hydrocarbons. Although the protonic zeolite was the most active in the acetone conversion (96.8% conversion), the metal-exchanged zeolites showed varied selectivities towards different products of the reaction. In particular, we found the Cu-β to have a considerable selectivity towards the production of isobutene from acetone (over 31% yield compared to 7.5% of the protonic zeolite). We propose different reactions mechanisms in order to explain the final product distributions.
47 citations
TL;DR: In this paper, the electrical properties of carbon nanotubes mat in the presence of benzene, toluene, methanol, ethanol and acetone vapors are studied by impedance spectroscopy.
Abstract: Oxygen plasma functionalized multiwall carbon nanotubes (MWCNTs) were used for detecting volatile organic compounds at room temperature. Alumina substrates with interdigitated gold electrodes were employed as transducers and the air-brushing method was used to coat them with carbon nanotube mats. The electrical properties of the carbon nanotubes mats in the presence of benzene, toluene, methanol, ethanol and acetone vapors are studied by impedance spectroscopy. The resistance variation of the prepared MWCNTs films increases with the concentration of the different vapors tested. For benzene and toluene, the sensors are highly responsive and fully recover their baseline resistance when operated at room temperature. On the other hand, in the presence of methanol, ethanol and acetone some baseline drift is present. Additionally, the response time of the sensors to the aromatic vapors is compared against those obtained for alcohols and acetone vapors. The fast response kinetics for alcohols and acetone together with the baseline drift present for these vapors suggest that these species are chemisorbed at the carbon nanotube surface. The slower response kinetics and absence of baseline drift suggest that the aromatic volatile organic compounds tested physisorb at the carbon nanotube surface. Within aromatic volatiles, discrimination seems to be possible based on the presence/absence of methyl groups.
47 citations