Reaction on Pure Metals

Little attention has been paid to the kinetics of dehydrogenations. Sinfelt has re-examined early work on methylcyclohexane, and has concluded that at 588 K it reacts eight times more slowly than cyclohexane, the activation energy E k being 138 kJ mol On platinum black, cyclohexane exchanged with deuterium 

however, conditions are chosen appropriately, rates are a linear fraction of amounts of hydrogen chemisorbed thus with platinum and rhodium on ceria, alumina and their mixtures, such a linear plot has been used as a means of estimating dispersion from activity measurement, this being a more sensitive and simple procedure than determining an adsorption isotherm. Thus after reduction at 1273 K, the dispersion of a platinum catalyst was estimated to be 3%. 

Although little work has been published on the other metals of Groups 8 to 10, some of them feature as one terminus of a bimetallic series to be considered 

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The largest exchange current density, j0, of the reaction has to be selected, if possible, since economic limitations are always prevalent in scaled-up engineering. However, with the development of nanodispersed substrates and carbon-supported metal catalysts, this limitation becomes a secondary consideration. At this point, it is important to say that most of the reported values of j usually refer to simple reactions on pure metal substrates using different shapes of electrode designs in a certain and single electrolyte. Thus, the measurement of the real j0 value at select industrial conditions of the electrochemical reactor has to be performed that is, experimental measurements cannot be avoided [4,5]. 

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