Manganese oxide-based catalysts for toluene oxidation

Sihaib, Zakaria; Puleo, Fabrizio; García-Vargas, Jesús Manuel; Retailleau, L.; Descorme, C.; Liotta, Leonarda F.; Valverde, J.L.; Gil, Sonia; Giroir‐Fendler, A.

doi:10.1016/j.apcatb.2017.03.042

Cited by 186 publications

(53 citation statements)

References 44 publications

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“…Diffraction patterns are shown in Figure 1 for samples prepared with a low molar ratio of CA to total metal ions (La 3+ + Mn 2+ ) (a), medium molar ratio (b), and high molar ratio (c), respectively. The diffraction lines of the LaMnO 3 phase were in good agreement with those of the reference La 0.951 Mn 0.951 O 3 (PDF 89-8775) with rhombohedral symmetry (space group R-3c), confirming our previous results [27,34]. Moreover, along with the characteristic peaks of the perovskite phase, for molar ratios ranging between 0.5 and 1.5 (see Figure 1a,b), very small features ascribed to the phase Mn 3 O 4 (PDF 2-1062) were Catalysts 2019, 9,226 3 of 17 detected at 2θ = 38.5 • .…”

Section: Characterizationsupporting

confidence: 89%

“…In a previous work [34], some of us successfully prepared LaMnO 3 perovskite by sol-gel for the oxidation of toluene, using a CA to total metal ions (La 3+ + Mn 2+ ) molar ratio fixed at 1.5, whose catalytic performance was compared to that of other manganese oxide-based catalysts. A good relationship between the reducibility and high specific surface area and the oxidation performance was found for the synthesized catalysts.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Citric Acid Concentration on the Properties of LaMnO3 as a Catalyst for Hydrocarbon Oxidation

et al. 2019

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LaMnO3 (LM) catalysts with a molar ratio of citric acid (CA) to metal (La3+ + Mn2+) nitrates ranging from 0.5 to 2 (LM0.5 to LM2) were synthesized by the citrate sol–gel method with the aim of studying the effect of the citric acid ratio on the physicochemical properties and the catalytic performance in hydrocarbon oxidation. Structural and morphological properties of these catalysts were characterized by X-ray diffraction (XRD) and specific surface area (N2 adsorption) measurements, while the chemical composition was determined by inductively coupled plasma atomic emission spectroscopy (ICP-OES). In the selected samples, additional characterizations were carried out by thermogravimetric and differential thermal analysis (TGA/DTA), Fourier Transform Infrared Spectroscopy (FT-IR), temperature-programmed reduction by hydrogen (H2-TPR), and X-ray photoelectron spectroscopy (XPS). The results showed that the amount of citric acid used significantly influenced the TGA/DTA profile of gels along with the physicochemical properties of the catalysts. The XRD patterns are consistent with the perovskite formation as the main phase. The segregation of a small amount of Mn3O4, detected for molar ratios ranging between 0.5 and 1.5, suggested the formation of a slightly nonstoichiometric LaMn1−xO3 phase with a relatively high content of Mn4+. The catalytic performance was evaluated in the total oxidation of two selected hydrocarbons, toluene and propene, which represent typical volatile organic compounds (VOCs). Typically, three consecutive catalytic cycles were performed in order to reach steady-state performance in toluene and propene oxidation. Moreover, the stability of the catalysts under reaction conditions was investigated through 24-h experiments at 17% of toluene conversion. The catalysts LM1.2, LM1.3, and LM1.5 showed the best catalytic performance in both hydrocarbon oxidations, well comparing with the Pd/Al2O3 used as a reference.

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Section: Characterizationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The Effect of Citric Acid Concentration on the Properties of LaMnO3 as a Catalyst for Hydrocarbon Oxidation

et al. 2019

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“…Experiments indicated that treating the LSM powder in hydrogen for 2 hours at 800°C caused the collapse of the perovskite structure, and LSM was indexed to Sr 1.5 La 0.5 MnO 4 (PDF: 83‐1898), Mn 2 O 3 (PDF: 24‐0508), and LaMnO 3.26 (PDF: 50‐0299). Manganese oxides and LaMnO 3 have been shown to be good catalysts for toluene oxidization . Oxygen vacancies produced by replacing La with Sr facilitates the adsorption of oxygen and the oxidation of toluene.…”

Section: Resultsmentioning

confidence: 99%

“…Manganese oxides and LaMnO 3 have been shown to be good catalysts for toluene oxidization. 27,28,41,44 Oxygen vacancies produced by replacing La with Sr facilitates the adsorption of oxygen and the oxidation of toluene. Therefore, LSM is expected to be active for toluene oxidation under typical SOFC operating conditions.…”

Section: Physical Characterization Of Catalystsmentioning

confidence: 99%

“…A common feature between the two methods is the need for oxygen. Tar can usually be completely oxidized into CO 2 or be selectively oxidized into other organic compounds, such as formaldehyde or benzoic acid in the liquid phase . A review by Doornkamp and Ponec concluded that when some organic compounds are catalytically oxidized by transition metal oxides, the lattice oxygen plays an important role in product formation by promoting the activation of oxygen species and a redox reaction, which is called the “MvK mechanism.” Liu indicated that the oxidation of toluene by transition metal oxide catalysts also follows the MvK mechanism …”

Section: Introductionmentioning

confidence: 99%

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A strategy to reduce the impact of tar on a Ni ‐ YSZ anode of solid oxide fuel cells

Chen

Guo

et al. 2019

Int J Energy Res

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Summary High‐temperature raw coke oven gas (COG) is a promising fuel for use in solid oxide fuel cells (SOFCs) because it is rich in both hydrogen (55%‐60%) and methane (23%‐27%). However, the tar present in COG limits its ability to directly generate power using state‐of‐art SOFCs because the presence of tar limits the cell's performance and stability. In this work, a strategy is presented in the attempt to reduce the influence of tar on SOFCs by applying a La0.7Sr0.3MnO3 catalyst as a protective layer for the cell. The results showed that 44‐g Nm−3 toluene had a profoundly negative effect on the performance of a conventional cell, which showed severely reduced performance after only 1.4 hours of exposure to toluene‐contaminated hydrogen. In contrast, the catalyst‐modified cell showed good stability for at least 110 hours under the same conditions. This work provides a promising route to directly utilize raw COG as an SOFC fuel that is also suitable for biosyngas.

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Catalytic Oxidation of BTX (Benzene, Toluene, and Xylene) Using Metal Oxide Perovskites

Yuan,

Li,

Liu

et al. 2024

Adv Funct Materials

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The high toxicity, volatility, and dispersion of the light aromatics, benzene, toluene, and xylene (BTX) pose a serious threat to the environment and human health. Compared to incineration, catalytic oxidation technologies for BTX removal offer benefits such as low energy consumption, high efficiency, and low pollution. ABO3–type perovskite catalysts (ABO3–PCs) are particularly promising materials for the catalytic oxidation of BTX due to their high activity and thermal stability, as well as their adjustable elemental composition and flexible structure allowing their properties to be improved. Nonetheless, the full potential of ABO3–PCs for the oxidation of BTX has yet to be reached. This review systematically and critically analyses progress in the catalytic oxidation of BTX by ABO3–PCs. Catalytic performance is assessed for each category of perovskite, including non–doped, doped (A–, B–, or A/B–site doped), and loading type (noble metal, metal oxide, and matrix composite), with structure–activity relationships are established. A kinetic model and proposed mechanism for the catalytic oxidation of BTX are also presented. Finally, the challenges and opportunities of ABO3–PCs applied to BTX oxidation and other reactions are highlighted.

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Manganese oxide-based catalysts for toluene oxidation

Cited by 186 publications

References 44 publications

The Effect of Citric Acid Concentration on the Properties of LaMnO3 as a Catalyst for Hydrocarbon Oxidation

The Effect of Citric Acid Concentration on the Properties of LaMnO3 as a Catalyst for Hydrocarbon Oxidation

A strategy to reduce the impact of tar on a Ni ‐ YSZ anode of solid oxide fuel cells

Catalytic Oxidation of BTX (Benzene, Toluene, and Xylene) Using Metal Oxide Perovskites

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