Control of transition metal–oxygen bond strength boosts the redox ex-solution in a perovskite oxide surface

2020 ◽  
Vol 13 (10) ◽  
pp. 3404-3411 ◽  
Author(s):  
Kyeounghak Kim ◽  
Bonjae Koo ◽  
Yong-Ryun Jo ◽  
Siwon Lee ◽  
Jun Kyu Kim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Bond Strength ◽  
Co Oxidation ◽  
Perovskite Oxide ◽  
Oxide Surface ◽  
Oxygen Bond

Tuning of the cation–oxygen bond strength effectively promotes B-site ex-solution in a perovskite, thereby boosting the catalytic activity of CO oxidation.

scholarly journals Importance of the oxygen bond strength for catalytic activity in soot oxidation

2016 ◽  
Vol 188 ◽  
pp. 235-244 ◽  
Author(s):  
Jakob M. Christensen ◽  
Jan-Dierk Grunwaldt ◽  
Anker D. Jensen
Keyword(s):  
Catalytic Activity ◽  
Bond Strength ◽  
Soot Oxidation ◽  
Oxygen Bond

Attenuating a metal–oxygen bond of a double perovskite oxide via anion doping to enhance its catalytic activity for the oxygen reduction reaction

2020 ◽  
Vol 8 (28) ◽  
pp. 14091-14098
Author(s):  
Lihong Zhang ◽  
Wang Sun ◽  
Chunming Xu ◽  
Rongzheng Ren ◽  
Xiaoxia Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Reaction Kinetics ◽  
Oxygen Reduction ◽  
Adsorption Process ◽  
Surface Adsorption ◽  
Double Perovskite ◽  
Reduction Reaction ◽  
Perovskite Oxide ◽  
Oxygen Bond

F-doping promotes the diffusion and surface adsorption process of oxygen at the cathode, and the reaction kinetics have been significantly improved.

Correlation between one-electron reduction and oxygen-oxygen bond strength in d0 transition metal peroxo complexes

1993 ◽  
Vol 32 (25) ◽  
pp. 5797-5799 ◽  
Author(s):  
M. Bonchio ◽  
V. Conte ◽  
F. Di Furia ◽  
G. Modena ◽  
S. Moro ◽  
...  
Keyword(s):  
Transition Metal ◽  
Bond Strength ◽  
Peroxo Complexes ◽  
Oxygen Oxygen ◽  
Electron Reduction ◽  
Oxygen Bond

scholarly journals Transition Metal Oxide-Based Perovskite Structures as a Bifunctional Oxygen Electrocatalysts: Fe Doped Lacoo3 Nanoparticles

2019 ◽  
Vol 9 (2) ◽  
pp. 3658-3662
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Transition Metal Oxides ◽  
Perovskite Structure ◽  
Sol Gel ◽  
Reduction Reaction ◽  
Perovskite Oxide ◽  
X Ray Diffraction ◽  
Valence Transition ◽  
Perovskite Nanoparticles

In this report, we have investigated lanthanum cobalt iron (LaCo1-xFexO3 ) perovskite nanoparticles synthesized by combining metallic nitrates, deionized water, and citric acid by using sol-gel method and subsequently calcinated at 400 °C for 1h and 900 °C for 7h, respectively. The formation of single-phase perovskite structure is a series of LaCo1-xFexO3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1). The crystal structure, mean particle, and morphology properties of the prepared LaCo1-xFexO3 perovskite oxide nanoparticles were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM). The perovskite structure has shown special performance for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activity in alkaline medium. As the combined valence transition metal oxides are rising capable candidates for bifunctional electrocatalysts, the electrochemical performance of the LaCo1- xFexO3 catalyst was thoroughly investigated. Koutecky-Levich results on the ORR polarization curves of all compounds shows that the four-electron pathway is favorable on these perovskite oxides. In this paper, we report B-site Fe doping in perovskite structure is a sufficient strategy to improve ORR and OER catalytic activity for application in metal-air batteries.

scholarly journals Synthesis and characterization of perovskite-supported CoNi catalyst for CO oxidation via exsolution

2021 ◽  
Vol 1195 (1) ◽  
pp. 012029
Author(s):  
G L Lew ◽  
N Ibrahim ◽  
S Abdullah ◽  
W R W Daud ◽  
W K W Ramli
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Production Rate ◽  
Perovskite Oxide ◽  
Metal Catalyst ◽  
Solid State Method ◽  
Cobalt Nickel ◽  
Co Conversion ◽  
Parameter Modification ◽  
Lower Temperature

Abstract The introduction of perovskite oxide as catalysts alternative has increased the worldwide interest due to its advantages such as its versatility to accommodate different transition metals. This study set out to evaluate the catalytic activity of CO oxidative perovskite catalysts (LCCNTO), fabricated via solid-state method and reduced under various reducing condition for the exsolution of the active metals, Cobalt-Nickel (CoNi) from the perovskite lattice. The effect of reducing parameter modification towards the catalytic activity of the fabricated LCCNTO was discussed in terms of CO conversion and CO2 production rate. Through the light-off test, the sample that reduced with the longest deration (S2T10H6-R5H5) showed the highest CO conversion of 45.45% and CO2 production rate of 0.1409 × 10−4 mol s− 1g−1 at the reaction temperature of 500 °C. Not only that, it was discovered that by controlling the reducing duration, the initiate temperature for the reaction to occur was lowered from 360 °C (S2T10H6-R5H3) enabling the reaction to occur at lower temperature at 280 °C in S2T10H6-R5H5. Under the same reducing temperature, the CO2 production of sample reduced for 200 minutes (S2T10H6-R5H3) started at 360 °C but as the reducing duration increased to 300 minutes (S2T10H6-R5H5), the CO oxidation initiated at a much lower temperature of 280 °C. Although LCCNTO catalyst still suffer from similar deterioration as the other reported base metal catalyst, but tuning the reducing duration given to a sample, it greatly affects the initiation temperature for the reaction to occur.

Single transition metal anchored C9N4 sheet as an efficient catalyst for CO oxidation: A first-principles study

2020 ◽  
Author(s):  
Junchao Huang ◽  
Chun Zhou ◽  
Zhaoqin Chu ◽  
Xu Liu ◽  
Xiangmei Duan
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Co Oxidation ◽  
First Principles ◽  
Efficient Catalyst ◽  
First Principles Study ◽  
Single Transition ◽  
Adsorption Energies

Single−atomic catalysts (SACs) often exhibit superb catalytic activity due to their high atomic utilization. By comparing the adsorption energies of O2 and CO adsorbed on TM@C9N4, we expect that Co...

The effect of partial exchange of sulphonated macroporous styrene-divinylbenzene copolymers for different ions on their catalytic activity

1981 ◽  
Vol 46 (10) ◽  
pp. 2354-2363 ◽  
Author(s):  
Svatomír Kmošták ◽  
Karel Setínek
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Metal Ions ◽  
Gas Phase ◽  
Transition Metal Ions ◽  
Exchange Capacity ◽  
Total Exchange Capacity ◽  
Styrene Divinylbenzene ◽  
Na Ions ◽  
Type Of Transition

The catalytic activity of sulphonated macroporous styrene-divinylbenzene copolymers, the exchange capacity of which was neutralized from 30, 50 and 80% by Fe(III) ions and from 30% by Na ions and that of Wofatit Y-37 ion exchanger neutralized from 10% of its total exchange capacity by several transition metal ions and by sodium has been studied in isomerisation of cyclohexene and dehydration of 1-propanol in the gas phase at 130 °C. It was demonstrated that in both reactions transition metal ions exhibit additional effect to the expected neutralization of the polymer acid groups. In the case of cyclohexene isomerization, this effect depends on the degree of crosslinking of polymer mass of the catalyst. Such dependence has not been, however, observed in dehydration of 1-propanol. The type of transition metal ions did not exhibit any significant effect on the catalytic activity of the polymer catalysts studied.

scholarly journals CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 131 ◽  
Author(s):  
Rola Mohammad Al Soubaihi ◽  
Khaled Mohammad Saoud ◽  
Myo Tay Zar Myint ◽  
Mats A. Göthelid ◽  
Joydeep Dutta
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
Bond Activation ◽  
Dissociative Adsorption ◽  
High Catalytic Activity ◽  
Good Catalytic Activity ◽  
Pretreatment Conditions ◽  
Oxidation Efficiency

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

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