scholarly journals STUDY ON ELECTRO-OXIDATION OF GLYCEROL IN ALKALINE MEDIUM USING TRIMETALLIC Pt-Pd-Ni COMPOSITE ELECTRODEPREPARED ON GLASSY CARBON

2018 ◽  
Vol 55 (5B) ◽  
pp. 126
Author(s):  
Huynh Thi Lan Phuong
Keyword(s):  
Activation Energy ◽  
Cyclic Voltammetry ◽  
Reaction Mechanism ◽  
Glassy Carbon ◽  
Oxidation Process ◽  
Diffusion Mechanism ◽  
Effect Of Temperature ◽  
First Order ◽  
Trimetallic Catalyst ◽  
Electro Oxidation

In this research, the effect of temperature and conversion of glycerol was studied by using cyclic voltammetry technique. The results showed that this reaction occurred following to diffusion mechanism with activation energy approximately of 3.44 (kcal/mol). Moreover, conversion of glycerol by electrolysis using Pt-Pd-Ni/C catalyst also was investigated and compared with the case of using pure Pt. Electrolysis process with electrode Pt-Pd-Ni/GC and pure Pt-was occurred by the first order and this result was well-suit with the previous study about the reaction mechanism of glycerol electro-oxidation process. Obtained results showed that conversion of glycerol on the trimetallic catalyst was higher than the pure Pt.

Preparation and Characterization of Platinum/Ceria-based Catalysts for Methanol Electro-oxidation in Alkaline Medium

2012 ◽  
Vol 1446 ◽  
Author(s):  
Christian L. Menéndez ◽  
Ana-Rita Mayol ◽  
Carlos R. Cabrera
Keyword(s):  
Particle Size ◽  
Cyclic Voltammetry ◽  
Cerium Oxide ◽  
Alkaline Medium ◽  
Glassy Carbon ◽  
Composite Electrodes ◽  
Deposition Technique ◽  
Electro Oxidation

ABSTRACTPlatinum/Cerium oxide-based catalysts for methanol electro oxidation were prepared by the occlusion deposition technique. Composite glassy carbon (GC) electrodes were modified and then tested towards the methanol electro oxidation half reaction in acid and alkaline medium. Cyclic voltammetry and chronoamperometry techniques were used to test the catalytic response of the composite electrodes. AFM studies were carried out in order to have a measurement of the particle size and distribution of the platinum/ceria catalyst on HOPG.

Kinetics and Mechanism of Oxidation of Selenium(IV) by Permanganate Ion in Aqueous Perchlorate Solutions

1993 ◽  
Vol 58 (3) ◽  
pp. 538-546 ◽  
Author(s):  
Refat M. Hassan ◽  
Sahr A. El-Gaiar ◽  
Abd El-Hady M. El-Summan
Keyword(s):  
Reaction Mechanism ◽  
Reaction Rate ◽  
Oxidation Process ◽  
Selenium Dioxide ◽  
Order Reaction ◽  
Acid Solutions ◽  
First Order ◽  
Acid Catalyzed ◽  
Mechanism Of Oxidation ◽  
Kinetics Of

The kinetics of permanganate oxidation of selenium dioxide in perchloric acid solutions at a constant ionic strength of 2.0 mol dm-3 has been investigated spectrophotometrically. A first-order reaction in [MnO4-] and fractional order with respect to selenium(IV) were observed. The reaction rate was found to be pH-independent at lower acid concentrations ([H+] < 0.5 mol dm-3) and was acid-catalyzed beyond this range. Addition of Mn2+ and F- ions leads to the prediction that MnO4- is the sole reactive species in the oxidation process. A tentative reaction mechanism consistent with the reaction kinetics has been proposed.

scholarly journals Kinetics of Oxidation of Tryptophan by Sodium Hypochlorite

1981 ◽  
Vol 36 (3) ◽  
pp. 359-361 ◽  
Author(s):  
Thomas Rausch ◽  
Frieder Hofmann ◽  
Willy Hilgenberg
Keyword(s):  
Activation Energy ◽  
Reaction Mechanism ◽  
Sodium Hypochlorite ◽  
Arrhenius Plot ◽  
Ph Dependence ◽  
Order Conditions ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Pseudo First Order ◽  
Kinetics Of

AbstractThe oxidation of tryptophan to 3-indoleacetaldehyde with sodium hypochlorite was investigated with 14C labelled DL-tryptophan. The reaction was performed under pseudo first order conditions. From the pH dependence of the reaction it was concluded that only the unprotonated tryptophan is converted to the aldehyde. The activation energy is 35 ± 2.2 (SE) kJ x mol-1 as derived from the Arrhenius plot. Variing the pH between 8.5 and 11.0 and the temperature in the range from 298 K to 318 K did not alter the selectivity of the reaction as confirmed by TLC of the product (purity ≧ 90%). A possible reaction mechanism is proposed.

The effect of temperature on the aggregation kinetics of partially bare gold nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 82138-82149 ◽  
Author(s):  
Anushree Dutta ◽  
Anumita Paul ◽  
Arun Chattopadhyay
Keyword(s):  
Activation Energy ◽  
Gold Nanoparticles ◽  
Effect Of Temperature ◽  
Aggregation Kinetics ◽  
Temperature Dependent ◽  
Colloidal Aggregation ◽  
First Order ◽  
First Order Kinetics ◽  
Kinetics Of ◽  
Bare Gold

Temperature dependent aggregation reaction of partially bare gold nanoparticles showed a first order kinetics and prevalence of reaction limited colloidal aggregation with an activation energy equal to 36.2 ± 3.0 kJ mol−1.

Electrochemical Oxidation of Borohydride on Cu Electrode

2011 ◽  
Vol 347-353 ◽  
pp. 3264-3267 ◽  
Author(s):  
Dong Hong Duan ◽  
Yi Fang Zhao ◽  
Shi Bin Liu ◽  
Ai Lian Wu
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Oxidation ◽  
Electrochemical Behavior ◽  
Intermediate Product ◽  
Electrode Materials ◽  
Oxidation Process ◽  
Potential Range ◽  
Direct Oxidation ◽  
Catalytic Activities ◽  
Electro Oxidation

The electrochemical behavior of BH4- on Cu electrode in 1M NaOH was investigated by cyclic voltammetry(CV) in the potential range of -1.2V to 0.4V versus Hg/HgO. The CV results show that Cu electrode has obvious catalytic activities to the BH4- hydrolysis which belongs to ‘catalytic’ electrode materials. The BH4- electro-oxidation process on Cu is complex and it could associate with the BH4- hydrolysis reaction, followed by oxidation of the intermediate H, then, the intermediate product (e.g. BH3OH−) oxidized, and direct oxidation of BH4- at more positive potentials.

scholarly journals Comparative testing of Ag/Au/Pt graphene electromodified electrodes in electrochemical detection of tetracycline-emerging pollutant

2020 ◽  
Vol 2 (2) ◽  
pp. 153-165
Author(s):  
Sorina Claudia Negrea ◽  
◽  
Lidia Ani Diaconu ◽  
Valeria Nicorescu ◽  
Dorian Neidoni ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Detection ◽  
Glassy Carbon ◽  
Oxidation Process ◽  
Modified Electrodes ◽  
Cathodic Potential ◽  
Comparative Testing ◽  
Diffusion Controlled ◽  
Emerging Pollutant ◽  
Ag Particles

This study aimed to obtain new electrochemically modified electrodes with graphene and Au, Pt, Ag particles considering graphite (GP) and glassy carbon (GC) substrate by applying the chronoamperometry technique to develop the detection protocol of tetracycline (TC) considered as an emerging pollutant in water, using cyclic voltammetry (CV) technique. The graphite-based substrate used for Ag/ Au/ Pt electrodeposition led to the electrode compositions on which TC oxidation process was not diffusion-controlled and as consequence, TC detection failed. TC detection protocols were developed for all Ag/Au /Pt electrodeposited GC and GCGP electrodes. Better limits of TC detection was achieved for Ag electrodeposited on GC-GP at the cathodic potential of 0.460 V/SCE.

The kinetic study of the addition of tetrachloromethane to styrene in the presence of copper complexes

1987 ◽  
Vol 52 (7) ◽  
pp. 1758-1763 ◽  
Author(s):  
Li Gwang Hun ◽  
Lubomír Nondek
Keyword(s):  
Activation Energy ◽  
Reaction Mechanism ◽  
Kinetic Study ◽  
Copper Complexes ◽  
Catalytic Mechanism ◽  
First Order ◽  
First Order Kinetics ◽  
Experimental Activation Energy ◽  
Pseudo First Order ◽  
Kinetics Of

Kinetics of the addition of tetrachloromethane to styrene catalyzed by copper-amine complexes was studied. The pseudo-first order kinetics in respect to styrene and the catalyst was observed at an excess of tetrachloromethane. The reaction mechanism involving a catalytic cycle compatible with the kinetic observations is proposed. The experimental activation energy, being about 104 kJ mol-1, indicates a catalytic mechanism.

Re-examination of the kinetics of the thermal dehydroxylation of kaolinite

Clay Minerals ◽  
1984 ◽  
Vol 19 (4) ◽  
pp. 653-661 ◽  
Author(s):  
J. M. Criado ◽  
A. Ortega ◽  
C. Real ◽  
E. Torres De Torres
Keyword(s):  
Reaction Mechanism ◽  
Diffusion Process ◽  
Diffusion Mechanism ◽  
Activation Energies ◽  
First Order ◽  
First Order Kinetics ◽  
Comparison Of The Results ◽  
Kinetics Of

AbstractThe results obtained from this study of kaolinite dehydroxylation explain why different investigators have ascribed both first-order kinetics and a diffusion mechanism to this reaction. The fact that activation energies reported by these workers agree well, in spite of the different kinetics assumed when performing the calculations, is also explained. From a comparison of the results obtained by isothermal and non-isothermal methods it is concluded that, for reacted fractions,α, <0·6, kaolinite dehydroxylation is controlled by a diffusion process. A reaction mechanism explaining this behaviour is proposed.

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