dehydrogenation


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dehydrogenation

[dē¦hī·drə·jə′nā·shən]
(chemistry)
Removal of hydrogen from a compound.

Dehydrogenation

A reaction in which hydrogen is detached from a molecule. The reaction is strongly endothermic, and therefore heat must be supplied to maintain the reaction temperature. When the detached hydrogen is immediately oxidized, two benefits accrue: (1) the conversion of reactants to products is increased because the equilibrium concentration is shifted toward the products (law of mass action); and (2) the added exothermic oxidation reaction supplies the needed heat of reaction. This process is called oxidative dehydrogenation. On the other hand, excess hydrogen is sometimes added to a dehydrogenation reaction in order to diminish the complete breakup of the molecule into many fragments.

The primary types of dehydrogenation reactions are vapor-phase conversion of primary alcohols to aldehydes, vapor-phase conversion of secondary alcohols to ketones, dehydrogenation of a side chain, and catalytic reforming of naphthas and naphthenes in the presence of a platinum catalyst. All four of these types of dehydrogenation reactions are of major industrial importance. They account for the production of billions of pounds of organic compounds that enter into the manufacture of lubricants, explosives, plastics, plasticizers, and elastomers.

References in periodicals archive ?
The styrene production process using catalytic dehydrogenation of ethyl-benzene was selected for simulation since it constitutes the most employed production process applied at commercial scale to obtain styrene (Speight, 2002).
With the irradiation dose increasing, the crystal structure and preferred orientation of PAN precursors were destroyed accompanying with dehydrogenation and cyclization reactions occurred.
Riboflavin-responsive multiple acyl-CoA dehydrogenation deficiency in 13 cases, and a literature review in mainland Chinese patients.
Beside these, the addition of Al effected the dehydrogenation of alloys negatively due to its positive effect on the dehydrogenation energy.
2005) Impact of the preparation method and iron impurities in Fe-ZSM-5 zeolites for propylene production via oxidative dehydrogenation of propane with [N.
The final desorption step involving LiH dehydrogenation typically occurs above 680 [degrees]C and is not practical under experimental conditions of interest.
y otros cuatro autores; Dehydrogenation and Oxydehydrogenetaion of Paraffins to Olefins, Appl.
A sampling of topics includes: EPR spectroscopy of polycrystalline oxide systems, the application of UV-visible-NIR spectroscopy to oxides, solid-state MNR of oxidation catalysts, photoelectron spectroscopy of catalytic oxide materials, transmission electron microscopy, vanadium phosphate catalysts, heterogeneous catalysis by uranium oxides, alkane dehydrogenation over vanadium and chromium, and oxide materials in photocatalytic processes.
Al Waha Petrochemicals is aiming to produce high specification polypropylene products using the most advanced propane dehydrogenation technology.
During testing of the complex for start-up, two rotors in the propane dehydrogenation (PDH) plant have been damaged, forcing the plant to postpone the start-up temporarily.
The other product of dehydrogenation is acetaldehyde, which can be used as an intermediate in the production of acetic acid, acetic anhydride, ethyl acetate, butyraldehyde, crotonaldehyde, n-butanol and many other chemicals.
The influence of the Sn/Ni ratio and the treatments of calcination and oxychlorination on the dispersion, reducibility and dehydrogenation activity of Ni/Si[O.