Mechanism of carbon monoxide oxidation on supported copper catalysts modified with cerium and platinum

Lộc, Lưu Cẩm; Tri, Nguyen; Cuong, Hoang Tien; Ha, Ahmed; Thoang, Ho Si; Gaidai, N. A.; Agafonov, Yu. A.; Лапидус, А. Л.

doi:10.1134/s0023158415060087

Cited by 6 publications

(7 citation statements)

References 35 publications

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“…Additionally, the effect of A metal depended on the CO/O 2 ratio; in 1% CO + 10% O 2, the increase in the CO conversion was similar for BMC-Ce, BMC-La, and BMC-Mg, but, for the reactant mixture with the lowest CO/O 2 ratio (0.1% CO + 10% O 2 ), BMC-Ce featured the best performance. By comparing the T50% values for the three reactant mixtures tested, it is evident that, according to literature [50,51] and to our previous results for BM-A series [21], there was a clear effect of the CO/O2 ratio in the catalytic performance. Thus, in an excess of oxygen (1% CO + 10% O2 and 0.1% CO + 10% O2 gas mixtures), the T50% decreased for almost all samples (see data compiled in Table 3), with this effect being more relevant as the excess of oxygen increased.…”

Section: Catalytic Activitysupporting

confidence: 72%

“…By comparing the T 50% values for the three reactant mixtures tested, it is evident that, according to literature [50,51] and to our previous results for BM-A series [21], there was a clear effect of the CO/O 2 ratio in the catalytic performance. Thus, in an excess of oxygen (1% CO + 10% O 2 and 0.1% CO + 10% O 2 gas mixtures), the T 50% decreased for almost all samples (see data compiled in Table 3), with this effect being more relevant as the excess of oxygen increased.…”

Section: Catalytic Activitysupporting

confidence: 72%

“…Based on the literature, it can be assumed that the CO oxidation reaction using perovskites as catalysts follows the Langmuir–Hinshelwood (LH) mechanism, which involves the adsorption of CO and O 2 molecules followed by the reaction between them (being the adsorption of both species the rate-limiting step) [ 50 , 51 , 52 , 53 ]. It has been also established that, if a reactant mixture with a low CO percentage is used (like 1% CO + 10% O 2 or 0.1% CO + 10% O 2 ), oxygen will be preferentially chemisorbed on the surface oxygen vacancies (as it is in excess) and, subsequently, the CO molecules will be adsorbed on the remaining free active sites [ 54 , 55 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Catalytic Activitymentioning

confidence: 99%

“…Based on the literature, it can be assumed that the CO oxidation reaction using perovskites as catalysts follows the Langmuir-Hinshelwood (LH) mechanism, which involves the adsorption of CO and O2 molecules followed by the reaction between them (being the adsorption of both species the rate-limiting step) [50][51][52][53]. It has been also Based on the literature, it can be assumed that the CO oxidation reaction using perovskites as catalysts follows the Langmuir-Hinshelwood (LH) mechanism, which involves the adsorption of CO and O 2 molecules followed by the reaction between them (being the adsorption of both species the rate-limiting step) [50][51][52][53]. It has been also established that, if a reactant mixture with a low CO percentage is used (like 1% CO + 10% O 2 or 0.1% CO + 10% O 2 ), oxygen will be preferentially chemisorbed on the surface oxygen vacancies (as it is in excess) and, subsequently, the CO molecules will be adsorbed on the remaining free active sites [54,55].…”

Section: Catalytic Activitymentioning

confidence: 99%

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Improving the Catalytic Performance of BaMn0.7Cu0.3O3 Perovskite for CO Oxidation in Simulated Cars Exhaust Conditions by Partial Substitution of Ba

Ghezali,

Díaz Verde,

Illán Gómez

2024

Molecules

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The sol–gel method, adapted to aqueous media, was used for the synthesis of BaMn0.7Cu0.3O3 (BMC) and Ba0.9A0.1Mn0.7Cu0.3O3 (BMC-A, A = Ce, La or Mg) perovskite-type mixed oxides. These samples were fully characterized by ICP-OES, XRD, XPS, H2-TPR, BET, and O2–TPD and, subsequently, they were evaluated as catalysts for CO oxidation under different conditions simulating that found in cars exhaust. The characterization results show that after the partial replacement of Ba by A metal in BMC perovskite: (i) a fraction of the polytype structure was converted to the hexagonal BaMnO3 perovskite structure, (ii) A metal used as dopant was incorporated into the lattice of the perovskite, (iii) oxygen vacancies existed on the surface of samples, and iv) Mn(IV) and Mn(III) coexisted on the surface and in the bulk, with Mn(IV) being the main oxidation state on the surface. In the three reactant atmospheres used, all samples catalysed the CO to CO2 oxidation reaction, showing better performances after the addition of A metal and for reactant mixtures with low CO/O2 ratios. BMC-Ce was the most active catalyst because it combined the highest reducibility and oxygen mobility, the presence of copper and of oxygen vacancies on the surface, the contribution of the Ce(IV)/Ce(III) redox pair, and a high proportion of surface and bulk Mn(IV). At 200 °C and in the 0.1% CO + 10% O2 reactant gas mixture, the CO conversion using BMC-Ce was very similar to the achieved with a 1% Pt/Al2O3 (Pt-Al) reference catalyst.

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Section: Catalytic Activitysupporting

confidence: 72%

Section: Catalytic Activitysupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Catalytic Activitymentioning

confidence: 99%

Section: Catalytic Activitymentioning

confidence: 99%

See 3 more Smart Citations

Improving the Catalytic Performance of BaMn0.7Cu0.3O3 Perovskite for CO Oxidation in Simulated Cars Exhaust Conditions by Partial Substitution of Ba

Ghezali,

Díaz Verde,

Illán Gómez

2024

Molecules

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Copper Catalysts Supported on Barium Deficient Perovskites for CO Oxidation Reaction

2022

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Mixed oxides with perovskite-type structure (ABO3) present interesting physico-chemical properties to be used as catalyst for atmospheric pollution control. In this work, a series of CuX/Ba0.7MnO3 catalysts (being x: 0, 4, 8 and 12 wt%) has been synthesized, characterized and tested for CO oxidation reaction. All the catalysts were active for CO oxidation in the two reactant mixtures tested: low CO mixture (0.1% CO and 1% O2 in He) and near stoichiometric mixture (1% CO and 1% O2 in He). Copper-free perovskite is the most active catalyst in the less demanding conditions (0.1% CO and 1% O2), as it presents the highest amount of oxygen vacancies working as active sites. However, at higher CO concentrations (1% CO in near stoichiometric mixture), copper-containing catalysts were more active than the perovskite support because, due to the saturation of the oxygen vacancies of perovskites, CuO seems to participate as active site for CO and O2 activation. Cu4/Ba0.7MnO3 and Cu12/Ba0.7MnO3 are more active than Cu8/Ba0.7MnO3 catalyst, since they present a larger amount of active sites on surface. These two copper-containing catalysts present a high stability and recyclability during the reaction at 300 °C in an ideal near stoichiometric mixture (1% CO and 1% O2).

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Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

et al. 2020

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Mechanism of carbon monoxide oxidation on supported copper catalysts modified with cerium and platinum

Cited by 6 publications

References 35 publications

Improving the Catalytic Performance of BaMn0.7Cu0.3O3 Perovskite for CO Oxidation in Simulated Cars Exhaust Conditions by Partial Substitution of Ba

Improving the Catalytic Performance of BaMn0.7Cu0.3O3 Perovskite for CO Oxidation in Simulated Cars Exhaust Conditions by Partial Substitution of Ba

Copper Catalysts Supported on Barium Deficient Perovskites for CO Oxidation Reaction

Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

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