Catalysts for dehydrogenation

Saito, Y., S. Hodoshima, A. Shono, and K. Otake, Chemical recuperation of low-quality heats with use of dehydrogenation catalysts for organic hydrides. Proceedings of 9th Asian Hydrogen Energy Conference, Tokyo, 2007. 

In support of the conclusion based on silver, series of 0.2, 0.5, 1.0, 2.0, and 5.0 % w/w of platinum, iridium, and Pt-Ir bimetallic catalysts were prepared on alumina by the HTAD process. XRD analysis of these materials showed no reflections for the metals or their oxides. These data suggest that compositions of this type may be generally useful for the preparation of metal supported oxidation catalysts where dispersion and dispersion maintenance is important. That the metal component is accessible for catalysis was demonstrated by the observation that they were all facile dehydrogenation catalysts for methylcyclohexane, without hydrogenolysis. It is speculated that the aerosol technique may permit the direct, general synthesis of bimetallic, alloy catalysts not otherwise possible to synthesize. This is due to the fact that the precursors are ideal solutions and the synthesis time is around 3 seconds in the heated zone. 

In 1978 Union Carbide scientists reported the discovery and optimization of oxidative dehydrogenation catalysts for converting ethane into ethylene that were... 

Elemental copper is used as a dehydrogenation catalyst for the conversion of alcohols into aldehydes or ketones [344]. Its efficiency is en-... 

Heteropoly acids can also act as oxidation catalysts both in the vapor and liquid phase. In the vapor phase they are effective dehydrogenation catalysts for saturated carboxylic acids and aldehydes readily converting isobutyric acid to methacrylic acid (Eqn. 10.19). Methacrylic acid is produced in 70% selectivity at 72% conversion over (NH4)3PMoi204q at 260°C. This reaction takes place only when there is a substituent a to the carbonyl group of the reactant. 

The ZnX and CoX catalysts described in Section J,1 function as dehydrogenation catalysts for olefins, alkylaromatics, and aralkyl-amines. Activity was enhanced by the addition of NH3 to the reactants. As shown in Table XXXVIII, small amounts of butadiene were formed... 

The results of a complex investigation of the process and catalysts for heterogeneous synthesis of butadione (diacetyl) are presented. A series of the dehydrogenating catalysts for this reaction was investigated. The attention was focused on the study of... 

We have investigated a series of the dehydrogenating catalysts for this reaction. Our attention was focused on two of them. Further study of 2,3-butanediol dehydrogenation and oxidative dehydrogenation to butadione was performed using zinc-chromium oxide catalysts and vanadium-magnesium oxide catalysts as well. 

This is the earliest strategy for preparing a chiral solid hydrogenation-dehydrogenation catalyst (for reviews see [l-3,5,7,8]). Quartz, silk fibroin, cyclodextrin, and cellulose were applied as chiral supports of natural origin. With a Pd/silk catalyst up to 66 % optical yield was obtained in C=C bond hydrogenation, but subsequently the results proved irreproducible. 

Butyrolactones. - A variety of ruthenium3 4 and rhodium hydride30 complexes have been tested for their suitability as dehydrogenation catalysts for the oxidation of 1,4-diols into butyrolactones. with 2-substituted and 2,2-disubstituted diols, the regioselectivity can be almost complete and the accompanying excellent yields make the overall transformation ((336) - (337) ] a genuinely viable proposition. 

With GiO as carbocatalyst, oxidative cross condensations of various anihnes and ahphatic amines with benzyl amine to the corresponding Af-benzylidene derivatives have also been achieved by suppressing homocondensation of benzyl amine by using an excess of the cross-coupling partner [77]. Reduced GeO served as a reusable aerobic dehydrogenation catalyst for the preparation of azo compounds from their hydrazo precursors [79]. 

Uses Green rust-inhibitive pigment for paints, primers catalyst dehydrogenation catalyst for hydrocarbons polymerization of olefins in wash primers... 

Dolgykh, L., Stolyarchuk, I., Denyega, I., Strizhak, P. (2006). The use of industrial dehydrogenation catalyst for hydrogen production from bioethanol. International Journal of Hydrogen Energy, 31, 1607—1610. 

Marr AC (2012) OrganometaUic hydrogen transfer and dehydrogenation catalysts for the conversion of bio-renewable alcohols. Catal Sci Technol 2(2) 279-287... 

Experiments during the nineteenth century had shown that certain oxides could be used as dehydrogenation catalysts. For example, Jahn dehydrogenated methanol by passing the vapour over finely divided zinc or zinc oxide to produce a stoichiometric mixture of hydrogen and carbon monoxide. ... 

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