Acetone combustion

Acetone combusts when it comes into contact with chromyl dichoride. 

When acetone comes into contact with potassium tert-butylate, which is an extremely strong base, acetone combusts immediately. The same goes for butanone and methylisobutylketone. 

The detection of 1,2-propylene oxide in the products from methyl ethyl ketone combustion is particularly interesting. It parallels the formation of ethylene oxide in acetone combustion (8) and of 1,2-butylene oxide in the combustion of diethyl ketone. Thus, there is apparently a group of isomerization reactions in which carbon monoxide is ejected from the transition state with subsequent closing of the C—C bond. Examination of scale molecular models shows that reactions of this type are, at any rate, plausible geometrically. 

Reverting now to acetone combustion, no methane could be detected at 284°C., whereas at 498°C. about 0.7 mm. was formed per millimeter of acetone consumed. The explanation of this can be seen in the shift of the equilibrium in Reaction 5... 

Properties White, crystalline solid. Mp 128-130C, d 1.015 (30C). Soluble in methanol, ethanol, chloroform, and acetone. Combustible. 

Properties White, odorless crystals or powder. D 0.8198 (100/4C), mp 87.7C, refr index 1.4301 (100C). Insoluble in water soluble in alcohol, benzene, ether, acetone. Combustible. 

Properties White, crystalline solid. D 0.9730, mp 72C, bp 185C, flash p 190F (87.7C) (COC). Soluble in water, ethanol, toluene, acetone. Combustible. 

Properties Water-white liquid. Distilling range 157-160C, d 0.8490 (20/20C), fp approximately —11C, flash p 110F (43.3C) (COC). Partly soluble in water miscible with alcohol, benzene, acetone. Combustible. 

Properties Solid. D 0.888, mp 75-80C, iodine value 70-80. Soluble in isopropanol slightly soluble in alcohol and acetone. Combustible. 

Properties Clear, colorless, syrupy liquid odorless sweet taste. D 1.1155 (20C), bp 197.2C, fp-13.5C, bulk d 9.31 lb/gal (15/15C), refr index 1.430 (25C), flash p 240.8F (116C), autoign temp 775F (412C). Hygroscopic, lowers fp of water, relatively nonvolatile. Soluble in water, alcohol, and acetone. Combustible. 

Properties Liquid. D 1.385 (25C), refr index 1.5499 (25C). Insoluble in water, alcohol, and hexane partially soluble in benzene soluble in acetone. Combustible. 

Properties Amber, viscous, basic liquid or basic solid. The liquid contains 8-10% zinc, the solid contains 16% zinc. Very soluble in acetone. Combustible. 

A series of 7-aiumina- and silica-supported oxides as MnzOs, C03O4 and Sm-Mn, Sm-Co bimetallic combinations was prepared by incipient wetness impregnation of the supports with aqueous solutions containing the nitrates of the metals and citric acid. The results obtained with these catalysts in the acetone complete oxidation reaction have shown a predominant effect of the support and the transition metal nature. The silica-supported oxides exhibited a bulk-like behaviour with relatively little difference between the Mn and Co catalysts. In contrast, when supported on alumina the performance of the Mn catalysts was remarkably better than that of the Co-based ones. In this case, whereas the Sm-Mn catalysts maintained a rather good performance relative to that of Mn/Al203, the temperatures required for acetone combustion over the Sm-Co catalysts were significantly lower than the ones over C0/AI2O3. 

The light-off curves for acetone combustion over the catalysts based on the single Mn and Co oxides are presented in Fig. 1, and the corresponding values of the temperature T50 at which the acetone conversion reaches 50% are included in Table 1. It is clear from these results that the behaviour of the alumina-supported single metal oxides contrasts strongly with that of the silica-supported ones. The performance of Mn/Si-823 is very similar to the one of Co/Si-823 in accordance with the tendency of the respective unsupported Mn and Co oxides for this reaction... 

Fig. 1. Light-off curves for acetone combustion over the single oxide catalysts.

The light-off curves for acetone combustion over the series of catalysts based on the Sm-Mn and Sm-Co bimetallic combinations are presented in Figs. 2 and 3, respectively. The results obtained with the Sm-Mn samples calcined at 823 K are very similar to the ones attained with the... 

When compared to the case of the Co/Si02 catalysts, it can be seen that whereas over SmCo/Si-823 the temperatures required for total acetone combustion increase slightly, over the SmCo/Si-1073 catalyst these temperatures increase by more than 100 K. These results are somewhat similar to the ones obtained with the series of silica-supported manganese oxide catalysts. Despite the possible presence of SmCo03 in the catalyst calcined at 1073 K and the good catalytic performance of this perovskite in the acetone combustion [14], it seems likely that the behaviour of the SmCo/Si-1073 catalyst be mainly due to a poor dispersion of the supported metal oxides. This point is of particular importance for the perovskite oxides because the severe sintering taking place at temperatures above 973 K not only reduces the exposed surface area but also the density of surface defects active in oxidation reactions [23]. 

Chloride titrated potentiometrically with N/lOO silver nitrate in presence of nitric acid in acetone Combustion as above... 

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