Oxidation Kinetics of 1,2-Propanediol in the Presence of Pd and Pt Catalysts

2020 ◽  
Vol 850 ◽  
pp. 48-53
Author(s):  
Svetlana Chornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko ◽  
Reinis Drunka ◽  
Aija Krūmiņa
Keyword(s):  
Lactic Acid ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Oxidation Kinetics ◽  
Main Product ◽  
Pt Catalysts ◽  
Acid Yield ◽  
Active Metal ◽  
Oxidation Parameters ◽  
Kinetics Of

1.25 – 5wt%Pt/Al2O3, 1.25 – 5wt%Pd/Al2O3, 1wt%Pd/TiO2, 1 – 5wt%Pd/TiO2-NF, 1.25wt%Pt+1.25wt%Pd/Al2O3, 5wt%Pt/SiO2, 5wt%Pt/C catalysts were synthesised and tested in the selective oxidation of 1,2-propanediol by molecular oxygen. It was found that all catalysts were active in alkaline water solutions; lactic acid was obtained as the main product of the reaction. The conversion of 1,2-propandiol and the yield of lactic acid depended on the content of active metal in the catalysts. The most active for the oxidation of 1,2-propandiol were palladium-containing catalysts supported on TiO2 nanofibers (Pd/TiO2-NF). The highest 1,2-propanediol conversion (100 %) and lactic acid yield (96 %) were obtained using the 5wt%Pd/TiO2-NF catalyst at the following oxidation parameters: c0(1,2-propanediol) = 0.3 mol/L, P(O2) = 1 atm, n (1,2-propanediol)/n (Pd) = 500 mol/mol, t = 60 °C, c0(NaOH) = 1.5 mol/L.

Selective Oxidation of 1,2-Propanediol to Lactic Acid over Different Supported Au, Pt and Pd Catalysts

2019 ◽  
Vol 800 ◽  
pp. 88-92 ◽  
Author(s):  
Svetlana Chornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko ◽  
Konstantins Dubencovs
Keyword(s):  
Lactic Acid ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Heterogeneous Catalyst ◽  
Selective Oxidation ◽  
Main Product ◽  
Oxidation Process ◽  
Pd Catalysts ◽  
Oxidation With Molecular Oxygen ◽  
By Products

1,2-Propanediol selective oxidation with molecular oxygen in presence of heterogeneous catalyst is one of the most nature friendly 1,2-propanediol conversion methods. This work demonstrates Au, Pt and Pd containing catalysts’ activity and selectivity in a 1,2-propanediol oxidation process. The main product of the 1,2-propanediol catalytic oxidation was lactic acid, by-products were acetic and formic acids. It was found that Au based catalysts are best for 1,2-propanediol oxidation in alkaline water solutions. The best result was achieved using the 4.8wt%Au/Al2O3catalyst: selectivity by lactic acid was 94% with 1,2-propanediol conversion 100% (c0(1,2-propanediol) = 0.3 mol/L, P(O2) = 6 atm, n (1,2-propanediol)/n (Au) = 500, t = 60°C, c0(NaOH) = 1.5 mol/L).

Kinetic Model of the 1,2-Propanediol Oxidation Reaction in the Presence of 3wt%Pd/α-Al2O3 Catalyst

2021 ◽  
Vol 903 ◽  
pp. 143-148
Author(s):  
Svetlana Cornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko
Keyword(s):  
Activation Energy ◽  
Lactic Acid ◽  
Kinetic Model ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Oxidation Reaction ◽  
Main Product ◽  
Oxidation Process ◽  
Water Solution ◽  
Reaction Conditions

Supported 3wt%Pd/α-Al₂O₃ catalyst was tested in selective oxidation of 1,2-propanediol by molecular oxygen. It was found that the catalyst is active in an alkaline water solution. Lactic acid was obtained as the main product of the reaction. Influence of different reaction conditions on 1,2-PDO conversion and oxidation process selectivity was studied. Partial kinetic orders of the reaction with respect to 1,2-propanediol, c0(NaOH), p(O2), n(1,2-PDO)/n(Pd)) were determined and an experimental kinetic model of the catalytic oxidation reaction was obtained. Activation energy of the process was calculated and was found to be about 53 ± 5 kJ/mol.

Au/Mg(OH)2: Highly efficient for selective oxidation of 1,2-propanediol to lactic acid with molecular oxygen

2010 ◽  
Vol 53 (7) ◽  
pp. 1497-1501 ◽  
Author(s):  
Hong Ma ◽  
Xin Nie ◽  
JiaYing Cai ◽  
Chen Chen ◽  
Jin Gao ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Highly Efficient

Oxidation kinetics of YBa2Cu3O7−xthin films in the presence of atomic oxygen and molecular oxygen byin‐situresistivity measurements

1991 ◽  
Vol 69 (10) ◽  
pp. 7189-7201 ◽  
Author(s):  
K. Yamamoto ◽  
B. M. Lairson ◽  
J. C. Bravman ◽  
T. H. Geballe
Keyword(s):  
Molecular Oxygen ◽  
Oxidation Kinetics ◽  
Atomic Oxygen ◽  
Kinetics Of

Oxidation Kinetics of VB Group Metals by Atomic and Molecular Oxygen

2001 ◽  
pp. 331-337
Author(s):  
A. G. Gusakov ◽  
S. A. Raspopov ◽  
A. G. Voropayev ◽  
M. L. Zheludkevich ◽  
A. A. Vecher
Keyword(s):  
Molecular Oxygen ◽  
Oxidation Kinetics ◽  
Kinetics Of

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

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