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Author: A. C. Makrides
Publisher:
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Languages : en
Pages : 52
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A study of the behavior under N2 and propane gases, of smooth Pt electrodes in concentrated phosphoric acid electrolytes was carried out. The adsorption of propane on Pt from concentrated H3PO4 at 80C. was studied with anodic and cathodic charging curves. Neither of these by itself was found to give a reliable estimate of the adsorbate concentration, but together they provided an insight into the character of the adsorbed species. Initial adsorption is probably on a single site but substantial further material is adsorbed on 3 sites, except at low potentials. The stoichiometry of this 3 site adsorbate corresponds to direct adsorption of propane. At longer times of adsorption, the propane degrades and is partially oxidized. This adsorbed product releases about two electrons per Pt surface site atom during its oxidation at high potentials. Coverage with this species is high at some potentials, and is potentialdependent. The rate of adsorption is probably controlled by the rate of diffusion of propane to the electrode. Current potential curves for the oxidation of C3H8 on smooth Pt, from 85% H3PO4, at 130C, were also studied. The oxidation rate, at low potentials, is activationcontrolled, with a Tafel slope of about 2.3 RT/F. At higher potentials, the oxidation rate is controlled by diffusion of propane.
Author: A. C. Makrides
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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Book Description
A study of the behavior under N2 and propane gases, of smooth Pt electrodes in concentrated phosphoric acid electrolytes was carried out. The adsorption of propane on Pt from concentrated H3PO4 at 80C. was studied with anodic and cathodic charging curves. Neither of these by itself was found to give a reliable estimate of the adsorbate concentration, but together they provided an insight into the character of the adsorbed species. Initial adsorption is probably on a single site but substantial further material is adsorbed on 3 sites, except at low potentials. The stoichiometry of this 3 site adsorbate corresponds to direct adsorption of propane. At longer times of adsorption, the propane degrades and is partially oxidized. This adsorbed product releases about two electrons per Pt surface site atom during its oxidation at high potentials. Coverage with this species is high at some potentials, and is potentialdependent. The rate of adsorption is probably controlled by the rate of diffusion of propane to the electrode. Current potential curves for the oxidation of C3H8 on smooth Pt, from 85% H3PO4, at 130C, were also studied. The oxidation rate, at low potentials, is activationcontrolled, with a Tafel slope of about 2.3 RT/F. At higher potentials, the oxidation rate is controlled by diffusion of propane.
Author:
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Languages : en
Pages : 0
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A study of the behavior under N2 and propane gases, of smooth Pt electrodes in concentrated phosphoric acid electrolytes was carried out. The adsorption of propane on Pt from concentrated H3PO4 at 80C. was studied with anodic and cathodic charging curves. Neither of these by itself was found to give a reliable estimate of the adsorbate concentration, but together they provided an insight into the character of the adsorbed species. Initial adsorption is probably on a single site but substantial further material is adsorbed on 3 sites, except at low potentials. The stoichiometry of this 3 site adsorbate corresponds to direct adsorption of propane. At longer times of adsorption, the propane degrades and is partially oxidized. This adsorbed product releases about two electrons per Pt surface site atom during its oxidation at high potentials. Coverage with this species is high at some potentials, and is potentialdependent. The rate of adsorption is probably controlled by the rate of diffusion of propane to the electrode. Current potential curves for the oxidation of C3H8 on smooth Pt, from 85% H3PO4, at 130C, were also studied. The oxidation rate, at low potentials, is activationcontrolled, with a Tafel slope of about 2.3 RT/F. At higher potentials, the oxidation rate is controlled by diffusion of propane.
Author: B. N. Das
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Languages : en
Pages : 35
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The average particle size of platinum black samples was determined by X-ray diffraction, adsorption (BET), and electron microscopic techniques. Stacking faults, twinning, locked-in strain, and stored energy were obtained by the Warren-Averbach method. Particle size distribution was measured by two electron microscopic methods and found to conform to a log-normal distribution. Results obtained by the various methods are compared. (Author).
Author: J. Giner
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Category :
Languages : en
Pages : 108
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During this report period fifteen platinum blacks were prepared--thirteen by the established method of formaldehyde reduction of chloroplatinic acid, one by reduction with sodium carbonate and sodium formate, and one by the thermal decomposition of platinum diammine-dinitrite. The latter two preparations were relatively inactive. The best results obtained for the formaldehyde prepared blacks were 104ma/cm2 (5.3 ma/mg) at 400 mv vs. RHE for Pt black #73-74 or 115 ma/cm2 (6.0ma/mg) for #73-73.
Author: Glenn Stoner
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Category :
Languages : en
Pages : 32
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The anodic oxidation of normal hexane and cyclohexane in phosphoric acids gives two sets of measured parameters in two defined potential regions. Both sets are consistent with the same rate-determining step if one postulates a change from Langmuir to Temkin adsorption kinetics going from the lower (0.3 - 0.5 V) to the upper (0.57 - 0.8 V) potential region. The electrochemical activities of the hydrocarbons vary as follows: i sub C2H6 nearly equal to i sub C3H8 = 5 i sub n-hexane = 10 i sub cyclohexane. (Author).
Author: S. B. Brummer
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Category :
Languages : en
Pages : 53
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The mechanism of the anodic oxidation of saturated hydrocarbons on Pt electrodes in 12M H3PO4 at 130 degrees C has been investigated. Experimental techniques employed involve transient measurements of adsorbate coverage and currents, and steady state rates of hydrocarbon oxidation. (Author).
Author: Harry E. Stanley
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Category : Hydrocarbons
Languages : en
Pages : 108
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Author: M. Bonnemay
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Languages : en
Pages : 39
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Efforts were directed toward elucidating the mechanism of the adsorption of hydrocarbons on platinum. Determination of the characteristic constants of adsorption is accomplished by the adoption of a general method consisting in the combined use of three different techniques: gas chromatography, analysis of the adsorption by the decoupling method, and analysis of the steady state polarization curves. The theoretical bases of these three techniques are discussed and the general method is applied to the study of a number of alkanes and alkenes, at a temperature of 80C and in the media of H3PO4 5N and H2SO4 1N. Data are derived concerning the mechanism of adsorption and the relationship existing between the kinetic constants and the structure of the molecules involved is clarified. (Author).
Author: G. Foster
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Category :
Languages : en
Pages :
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Author: D. P. Archer
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Category :
Languages : en
Pages :
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