The anodic oxidation of carbon monoxide on gold in acid solutions

1984 ◽  
Vol 37 (12) ◽  
pp. 2415 ◽  
Author(s):  
TR Farrugia ◽  
RA Fredlein
Keyword(s):  
Carbon Monoxide ◽  
Anodic Oxidation ◽  
Linear Sweep Voltammetry ◽  
Oxidation Of Co ◽  
Oxide Formation ◽  
Linear Sweep ◽  
Potential Region ◽  
Scan Rate ◽  
Adsorption Of Co ◽  
Oxidation Of Carbon Monoxide

The anodic oxidation of carbon monoxide on gold was studied in the oxide-free potential region, linear sweep voltammetry being used to minimize electrode poisoning. Only when pco < c. 0.3 atm or when the reaction was inhibited by impurities were the plots of i against square root of scan rate linear. In other cases, i attained constant values at high scan rates; this is interpreted, together with other evidence, as due to the adsorption of CO prior to the start of the scan. Good Tafel plots were obtained under conditions where i was independent of scan rate, and the kinetic parameters are shown to be consistent with the Gilman reactant-pair mechanism. In the potential region of oxide formation on gold, the steady-state oxidation of CO proceeded with the formation of colloidal gold. The mechanism in this potential region was not investigated.

scholarly journals Current calculation of irreversible electrode reaction mechanismsin linear sweep voltammetry

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Ján Mocák ◽  
Estera Rábarová
Keyword(s):  
Chemical Reaction ◽  
Infinite Series ◽  
Digital Simulation ◽  
Linear Sweep Voltammetry ◽  
Electrode Reaction ◽  
Potential Range ◽  
Linear Sweep ◽  
Potential Region ◽  
Current Function ◽  
Simulation Techniques

Application of exponential infinite series gives highly accurate analytical solution contributing to the theory of linear sweep voltammetry for single scan experiments. We have calculated theoretical dimensionless current function (usually denoted as π1/2χ(bt)) at relevant potentials for irreversible charge transfer without a coupled chemical reaction. For this purpose several transformation techniques were used, which convert the derived infinite series into summable sequences. Since infinite series of further electrochemical mechanisms with irreversible electrode reaction have similar features (particularly those comprising preceding and catalytic chemical reaction), the same approach can be successfully applied also for further electrochemical mechanisms. The respective infinite series are divergent in the most important potential region at and after voltammetric peak therefore their transformation by Epsilon and Levin transform techniques was used. Necessary arbitrary precision arithmetic (APA) was implemented by UBASIC. The results were compared to the customary solution of Nicholson and Shain, who computed the current-potential curves by means of numerical solution of the integral equations but with a much lower precision. Our results were obtained in a broad potential range including the potential regions where the series are divergent. Obtained current functions are precise to 12 valid decimal numbers, which is utilizable for evaluation of the results achieved by various faster but less precise digital simulation techniques.

scholarly journals EFFECT OF IMPREGNATION PROCEDURE OF Pt/γ-AL2O3 CATALYSTS UPON CATALYTIC OXIDATION OF CO

2010 ◽  
Vol 3 (2) ◽  
pp. 98-101
Author(s):  
Triyono Triyono
Keyword(s):  
Carbon Monoxide ◽  
Acid Solution ◽  
Room Temperature ◽  
Platinum Catalyst ◽  
Chloroplatinic Acid ◽  
Oxidation Of Co ◽  
Activity Test ◽  
Platinum Dispersion ◽  
Al2o3 Catalyst ◽  
Oxidation Of Carbon Monoxide

The oxidation of carbon monoxide by oxygen using two catalysts prepared by two different methods has been investigated. In the first method, catalyst prepared by immersing γ-Al2O3 into the hexa-chloroplatinic acid solution at 80oC for 4 h, resulted Pt/γ-Al2O3 catalyst having platinum highly dispersed on the support. While that of immersing γ-Al2O3 in the hexa-chloroplatinic acid solution at room temperature for 12 h, produced Pt/ γ-Al2O3 catalyst where platinum dispersion was much lower. Catalytic activity test showed that platinum well dispersed on the support enhanced the activity for oxidation of carbon monoxide. The platinum impregnated at room temperature resulted in the poor activity.   Keywords: platinum catalyst, alumina, supported material, oxidation

scholarly journals EFFECT OF IMPREGNATION PROCEDURE OF Pt/γ-Al2O3 CATALYSTS UPON CATALYTIC OXIDATION OF CO

2010 ◽  
Vol 2 (1) ◽  
pp. 8-11
Author(s):  
Triyono Triyono
Keyword(s):  
Carbon Monoxide ◽  
Acid Solution ◽  
Room Temperature ◽  
Chloroplatinic Acid ◽  
Oxidation Of Co ◽  
Activity Test ◽  
Platinum Dispersion ◽  
Al2o3 Catalyst ◽  
Oxidation Of Carbon Monoxide ◽  
Catalytic Activity Test

The oxidation of carbon monoxide by oxygen using two catalysts prepared by two different methods has been investigated. In the first method, catalyst prepared by immersing γ-Al2O3 into the hexa-chloroplatinic acid solution at 80oC for 4 h, resulted Pt/γ-Al2O3 catalyst having platinum highly dispersed on the support. While that of immersing γ-Al2O3 in the hexa-chloroplatinic acid solution at room temperature for 12 h, produced Pt/ γ-Al2O3 catalyst where platinum dispersion was much lower. Catalytic activity test showed that platinum well dispersed on the support enhanced the activity of oxidation of carbon monoxide. The platinum impregnated at room temperature resulted in the poor activity.   Keyword: Catalyst, CO Oxidation, Platinum.

scholarly journals Electrochemical oxidation of carbon monoxide: From platinum single crystals to low temperature fuel cells catalysts - Part II: Electrooxidation of H2, CO and H2/CO mixtures on well characterized PtMo

2003 ◽  
Vol 68 (3) ◽  
pp. 191-205 ◽  
Author(s):  
Branimir Grgur ◽  
Nenad Markovic ◽  
Philip Ross
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Single Crystals ◽  
Electrochemical Oxidation ◽  
Surface Concentration ◽  
Oxidation Of Co ◽  
Oxidation Of Hydrogen ◽  
Low Temperature Fuel Cells ◽  
Platinum Single Crystals ◽  
Oxidation Of Carbon Monoxide

The oxidation of hydrogen and hydrogen?carbon monoxide mixture has been investigated on well-characterized metallurgically prepared platinum?molybdenum (PtMo) alloys. It was concluded that the optimum surface concentration of molybdenum is near 23 mol.%. Based on experimentally determined parameters and simulations, the mechanism of the oxidation of CO/H2 mixtures is discussed.

Effect of water on the oxidation of CO by a Criegee intermediate

2020 ◽  
Vol 22 (37) ◽  
pp. 21257-21266
Author(s):  
Amit Kumar ◽  
Subhasish Mallick ◽  
Pradeep Kumar
Keyword(s):  
Carbon Monoxide ◽  
Oxidation Of Co ◽  
Effect Of Water ◽  
Oxidation Of Carbon Monoxide

The present work employs the CCSD(T)/CBS//M06-2X/aug-cc-pVTZ level of theory to investigate the effect of a water monomer and dimer on the oxidation of carbon-monoxide by a Criegee intermediate (CH2OO).

Catalytic activity of corrole complexes with post-transition elements for the oxidation of carbon monoxide: a first-principles study

2018 ◽  
Vol 42 (15) ◽  
pp. 12632-12643 ◽  
Author(s):  
Afshan Mohajeri ◽  
Nasim Hassani
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Theoretical Investigation ◽  
First Principles ◽  
High Performance ◽  
Transition Elements ◽  
Oxidation Of Co ◽  
First Principles Study ◽  
Oxidation Of Carbon Monoxide ◽  
Gallium Complexes

Our theoretical investigation shows that the aluminum and gallium complexes of corrole can be considered as potential high-performance catalysts for the oxidation of CO.

CATALYTIC OXIDATION OF CARBON MONOXIDE PRESENT IN LOW CONCENTRATIONS

1960 ◽  
Vol 38 (10) ◽  
pp. 1990-1998 ◽  
Author(s):  
S. Sourirajan ◽  
Mauro A. Accomazzo
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Oxidation ◽  
Oxidation Of Co ◽  
Entire Concentration Range ◽  
Engine Operation ◽  
Exhaust Gases ◽  
Low Concentrations ◽  
Gas Space ◽  
Order Rate Equation ◽  
Oxidation Of Carbon Monoxide

The oxidation of carbon monoxide present in low concentrations has been studied in the presence of the CuO–Al2O3 (1:1) catalyst using 1,000–10,000 p.p.m. of CO in air in the temperature range 120°–322 °C, and gas space velocities ranging from 8,000–16,000 hr−1. It was found that for the entire concentration range studied, the percentage of oxidation of CO at a given temperature was independent of its initial concentration and at temperatures above 200 °C, more than 95% of CO was removed by oxidation at all gas space velocities up to 16,000 hr−1. A simple first-order rate equation was found to fit the experimental data well. The presence of water vapor in the reactant gas was found to have no effect on the efficiency of the catalyst at temperatures above 225 °C. The possible practical utility of the above catalyst for the removal of carbon monoxide present in auto exhaust gases was tested using a six-cylinder Chevrolet engine run on leaded gasoline fuel. It was found that under all conditions of engine operation, more than 99% of carbon monoxide present in the exhaust gases was removed by catalytic oxidation when the initial temperature of the catalyst bed was kept at or above 220 °C.

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

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