Isopropanol dehydrogenation

Tessag Edeleanu GmbH Acetone Isopropanol Dehydrogenation reaction with copper-containing catalyst 3 1983... 

N.N. Michalenko, E.V. Khrapova, and V.M. Gryaznov, Effect of hydrogen transfer through the membrane catalyst from the Pd-Ru alloy on the rate of isopropanol dehydrogenation and cyclopentadiene hydrogenation, Neftekhimiya 18 354 (1978). 

Aceione production route 1 Isopropanol dehydrogenation Direct oxidation... 

Isopropanol Dehydrogenation Pt/MWCNT Low-loading Pt/MWCNT present higher TOFs than their connterparts on activated carbon or graphite flakes. 347... 

The influence of catalysis on mechanical strength and durability has been systematically studied in the catalytic reaction of isopropanol dehydrogenation using a porous magnesium oxide catalyst [6,48,112,116]. The compressive strength of the catalyst pills was lowered by 1.5-2 times when the reaction was in progress for 20-30 s, even prior to reaching the steady state. In these experiments, the measurements were conducted after the samples had been pulled out of the reactor and dried. 

Table 5.5 Solid properties and relative activity of isopropanol dehydrogenation...

Process Isopropanol dehydrogenation" 0X0 aldehyde hydrogenation 0X0 aldehyde hydrofining... 

C. Sbeely, Jr., Kinetics of Cataljtk Dehydrogenation of Isopropanol, University Microfilms, Arm Arbor, Michigan, 1953, p. 3. 

Acetone (2-propanone), is produced from isopropanol by a dehydrogenation, oxidation, or a combined oxidation dehydrogenation route. 

Acetone can also he coproduced with allyl alcohol in the reaction of acrolein with isopropanol. The reaction is catalyzed with an MgO and ZnO catalyst comhination at approximately 400°C and one atmosphere. It appears that the hydrogen produced from the dehydrogenation of isopropanol and adsorbed on the catalyst surface selectively hydrogenates the carhonyl group of acrolein ... 

Acetone is to be produced by the dehydrogenation of an aqueous solution of isopropanol according to the reaction ... 

This indicator possesses the advantage that it may be used under aerobic conditions, in contrast to dyes such as methylene blue (115). Resazurin has also been applied in the study of the dehydrogenation of isopropanol and sorbitol (103), (118). 

Alcohols will serve as hydrogen donors for the reduction of ketones and imi-nium salts, but not imines. Isopropanol is frequently used, and during the process is oxidized into acetone. The reaction is reversible and the products are in equilibrium with the starting materials. To enhance formation of the product, isopropanol is used in large excess and conveniently becomes the solvent. Initially, the reaction is controlled kinetically and the selectivity is high. As the concentration of the product and acetone increase, the rate of the reverse reaction also increases, and the ratio of enantiomers comes under thermodynamic control, with the result that the optical purity of the product falls. The rhodium and iridium CATHy catalysts are more active than the ruthenium arenes not only in the forward transfer hydrogenation but also in the reverse dehydrogenation. As a consequence, the optical purity of the product can fall faster with the... 

Since these are chemical equilibriiun reactions, by modifying the reaction conditions, i.e., using acetone as solvent instead of isopropanol, the reaction can be reversed, and therefore used for the oxidation (dehydrogenation) of alcohols (Oppenauer-type oxidation) [43]. Moreover, since acetone is the hy-... 

Acetone can also be produced from isopropanol using several methods, but the main method is by catalytic dehydrogenation ... 

Even isopropanol and other secondary alcohols cannot superimpose on the surface during dehydrogenation (Fig. 2). Since the difference in the dehydrogenation of the secondary and primary alcohols is only a quantitative one, the latter should also react on the elevations in the form of Taylor s peaks (<5) or Volkenshtein s biographical active centers (6). But the author (7) believes, moreover, these elevations to be carriers of crystal facets. Such islets are metastable and, depending on their differences in heights and surface areas and consequently in the deformations caused by the neighboring lattice atoms, are subject to statistical treatment. If their distribution bears an exponential character, then this can explain the appearance of parameter h in Equation (1) 8-11). 

Mundy CJ, Colvin ME, Quong AA (2002) Irradiated guanine a Car-Parinello molecular dynamics study of dehydrogenation in the presence of an OH radical. J Phys Chem A 106 10063-10071 Murata-Kamiya N, Kamiya H, Muraoka M, Kaji H, Kasai H (1998) Comparison of oxidation products from DNA components byy-irradiation and Fenton-type reactions. J Radiat Res 38 121-131 Nabben FJ, van der Stroom HA, Loman H (1983) Inactivation of biologically active DNA by isopropanol and formate radicals. Int J Radiat Biol 43 495-504 Nakashima M, Hayon E (1979) Rates of reaction of inorganic phosphate radicals in solution. J Phys Chem 74 3290-3291... 

Within the pressure range 2 to 30 Torr isopropanol, the dehydrogenation is a first-order reaction with strong inhibition by water. The simultaneously occurring dehydration is a zero-order reaction (Eqs. 27 to 29). Illumination was found to produce no change in the kinetics. 

When some straight and branched-chain aliphatic alcohols, such as n-propanol, n-butanol and isopropanol, are subjected to high temperatures, dehydrogenation products predominate over dehydration (51). Presumably the eliminations take place via a six-membered transition state and are catalyzed by hydrogen halides in the homogeneous phase (52) to produce olefins. On the other hand, gas phase dehydration over solid catalysts is a valuable process for the preparation of olefins and ethers. 

Corma, A., Fomes, V. and Rey, F. Hydrotalcites as base catalysts influence of the chemical composition and synthesis conditions on the dehydrogenation of isopropanol, J. Catal., 1994, 148, 205-12. 

The decomposition of isopropanol proceeds either via (A) dehydration to propene or (B) dehydrogenation to acetone. Both continuous- and pulse-flow measurements have shown that the reactions have similar rates on VI and V8, but (A) is faster than (B) on V8. Reaction (A) requires acid centers these are entirely removed when the soluble vanadium species are removed by isobutanol or NH4OH [28q],... 

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