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, ZnO thin films were prepared by reactive RF sputtering on thermally oxidized Si for gas sensing applications, and three VOC vapors were chosen to investigate the response behavior of the prepared ZnOs.
95 citations
TL;DR: In this paper, the condensation and selective hydrogenation of acetone to methyl isobutyl ketone (MIBK) was studied on a directly comparable series of 0.1-1.5-wt% Pd and Pt catalysts supported on hydrotalcite (HT)-derived Mg Al mixed-oxides in a liquid-phase batch micro-reactor at 99-153-°C and 400-psig.
Abstract: The condensation and selective hydrogenation of acetone to methyl isobutyl ketone (MIBK) was studied on a directly comparable series of 0.1–1.5 wt% Pd and Pt catalysts supported on hydrotalcite (HT)-derived Mg Al mixed-oxides in a liquid-phase batch micro-reactor at 99–153 °C and 400 psig. The support catalyzes the condensation of acetone to diacetone alcohol (DAA) and its subsequent dehydration to mesityl oxide (MO); Pd and Pt catalyze the selective hydrogenation of MO to MIBK. The net yield of MIBK is independent of metal type and loading, depending only on the wt% of exposed metal. However, the by-products are quite different-Pt/HT is more selective for the direct hydrogenation to isopropanol (IPA) while Pd/HT forms more of the intermediate diacetone alcohol (DAA). Among the Pd- and Pt-based catalysts examined, the 0.1 wt% Pd/HT gives the maximum MIBK yield of ∼32%, with an unusually low selectivity to IPA, 0.6 mol% compared to 15 mol% for the next best catalyst. This appears to be due to its higher basicity, and (to a lesser extent) to its minimal concentration of metal sites. This metal loading is sufficient to fully hydrogenate mesityl oxide to MIBK, and it also shows minimal acetone hydrogenation to isopropanol. A study of physically mixed Pd/silica + HT versus Pd/HT shows that the acid/base and hydrogenation functions need not be molecularly close.
95 citations
TL;DR: On the other hand, on Degussa P25, a mixture of anatase and rutile, more than 20% of a monolayer of acetone forms mesitylene during temperature-programmed desorption or hydrogenation as mentioned in this paper.
94 citations
TL;DR: High reaction rates and yields of isolated products were obtained using fatty acid vinyl esters, e.g., 6-O-palmitoyl-l-ascorbic acid was obtained in 91% isolated yield after 48 h.
Abstract: Fatty acid esters of vitamin C (ascorbic acid) where synthesized in a mainly solid-phase system in the presence of small amounts of organic solvent (acetone or t-butanol) catalyzed by immobilized lipase B from Candida antarctica.Highest reaction rates and yields of isolated products were obtained using fatty acid vinyl esters, e.g., 6-O-palmitoyl-l-ascorbic acid was obtained in 91% isolated yield after 48 h. As vitamin C and its esters are very sensitive to oxidation, a mild extraction method for the isolation of reaction products was developed.
94 citations
TL;DR: In the absence of Lewis and Bronsted acid sites, as well as of basic sites (i.e., on silica), acetone molecules are weakly hydrogen-bonded to surface OHδ+ groups to desorb completely at 100 °C, without involvement in any further surface reactions.
Abstract: Pathways and generated surface species of adsorption and consequent surface reactions of acetone vapor on characterized silica, alumina, and ∼5 wt % silica−alumina were examined by in-situ infrared (IR) spectroscopy, following degassing at room (RT) and higher temperatures (100−400 °C). For reference and confirmatory purposes, adsorptives of mesityl oxide and acetic acid, and adsorbents of K-modified and pyridine-covered silica−alumina, were employed. In the absence of Lewis and Bronsted acid sites, as well as of basic sites (i.e., on silica), acetone molecules are weakly hydrogen-bonded to surface OHδ+ groups to desorb completely at 100 °C, without involvement in any further surface reactions. The availability of such acid−base sites on alumina and silica−alumina facilitates acetone chemisorption and activation for aldol condensation type surface reactions, leading to formation of surface species of mesityl oxide at RT to 200 °C and their oxidative conversion into acetate species at 300−400 °C. A more ob...
94 citations