Oxygen Storage Characteristics and Redox Behaviors of Lanthanum Perovskite Oxides with Transition Metals in the B-Sites

Jiang, Yuanjie; Li, Zhishan; Zhu, Tao; Li, Dongfang; Wang, Hua; Zhu, Xing

doi:10.1021/acs.energyfuels.3c00569

Cited by 8 publications

(1 citation statement)

References 70 publications

(117 reference statements)

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“…Perovskite-type mixed oxides (ABO 3 ) are widely used in industry due to their low price, high stability, and good optical, magnetic, electronic, and ferroelectric properties [14]. Additionally, perovskites present interesting catalytic properties that mainly depend on the nature of B metal and that can be modulated by adding some transition metals able to improve their redox properties (associated with the oxidation state of B metal and the formation of oxygen vacancies) and, therefore, catalytic activity [15,16]. Recent results have revealed that these catalysts can be used for the control of pollutants generated by ICEs [17,18].…”

Section: Introductionmentioning

confidence: 99%

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Montilla-Verdú,

Díaz-Verde,

Torregrosa-Rivero

et al. 2023

Catalysts

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In this study, we analyzed the role of a series of BaMn1−xNixO3 (x = 0, 0.2, and 0.4) mixed oxide catalysts, synthesized using the sol–gel method, in NOx-assisted diesel soot oxidation. ICP-OES, XRD, XPS, and H2-TPR techniques were used for characterization and Temperature-Programmed Reaction experiments (NOx-TPR and Soot-NOx-TPR), and isothermal reactions at 450 °C (for the most active sample) were carried out to determine the catalytic activity. All samples catalyzed NO and soot oxidation at temperatures below 400 °C, presenting nickel-containing catalysts with the highest soot conversion and selectivity to CO2. However, the nickel content did not significantly modify the catalytic performance, and in order to improve it, two catalysts (5 wt % in Ni) were synthesized via the hydrothermal method (BMN2H) and the impregnation of nickel on a BaMnO3 perovskite as support (M5). The two samples presented higher activity for NO and soot oxidation than BMN2E (obtained via the sol–gel method) as they presented more nickel on the surface (as determined via XPS). BMN2H was more active than M5 as it presented (i) more surface oxygen vacancies, which are active sites for oxidation reactions; (ii) improved redox properties; and (iii) a lower average crystal size for nickel (as NiO). As a consequence of these properties, BMN2H featured a high soot oxidation rate at 450 °C, which hindered the accumulation of soot during the reaction and, thus, the deactivation of the catalyst.

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Section: Introductionmentioning

confidence: 99%

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Montilla-Verdú,

Díaz-Verde,

Torregrosa-Rivero

et al. 2023

Catalysts

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Manganese‐Based Composite‐Structure Cathode Materials for Sustainable Batteries

Liu,

Wang,

et al. 2024

Advanced Energy Materials

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Manganese‐based cathode materials have garnered extensive interest because of their high capacity, superior energy density, and tunable crystal structures. Despite their cost‐effectiveness, challenges like Mn dissolution and gas evolution originating from the irreversible structural degradation pose risks to stability and prolonged electrochemical behaviors, ultimately constraining their practical applications and market prospects. While the material characteristics and redox mechanisms of Mn‐based cathodes are extensively investigated, a systematic iterative approach to material design that balances performance and application demands remains both necessary and urgent. Recent strategies for enhancing cathode performances emphasize the innovative introduction and customization of composite structures in Mn‐based cathode materials to address the challenges above. This review aims to provide a comprehensive understanding of composite‐structure construction methodologies and offers practical guidelines for effectively designing high‐stability Mn‐based composite‐structure cathode materials. This encompasses the classifications of composite scales, the discussions for the extent of composite‐structure construction inside and outside of the cathode grains, and an exploration of the development potential of these materials, especially for grid‐scale applications.

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Promoting Effect of Pd Nanoparticles on SrTi_0.8Mn_0.2O₃ in the Reverse Water‐Gas Shift Reaction via the Mars–Van Krevelen Mechanism

Kobayashi,

Naniwa,

Goto

et al. 2024

ChemCatChem

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The reverse water‐gas shift (RWGS) reaction serves as a critical pathway for converting CO2 into diverse chemicals. The Mars–van Krevelen (MvK) mechanism, which leverages lattice oxygen as the oxidant and oxygen vacancies as reductants, offers an alternative catalytic strategy for the selective RWGS reaction. While Mn‐substituted SrTiO3 (i.e., SrTi0.8Mn0.2O3) has been shown to promote the RWGS reaction selectively via the MvK mechanism, achieving a sufficient conversion of CO2 necessitates elevated temperatures. This study investigated the effect of Pd‐loaded SrTi0.8Mn0.2O3 on the activation of adsorbed H2 molecules, which generated oxygen vacancies and enhanced CO2 conversion. Notably, 1.0 wt% Pd‐loaded SrTi0.8Mn0.2O3 yielded 13.4% of CO at 673 K, whereas pristine SrTi0.8Mn0.2O3 and Pd‐loaded SrTiO3 yielded negligible or minimal amount of CO. Hydrogen temperature‐programmed reduction and X‐ray absorption spectroscopy measurements revealed that Pd promoted the formation of oxygen vacancies via both thermodynamic and kinetic mechanisms. Fourier transform infrared spectroscopy and kinetic studies revealed that the RWGS reaction over Pd‐loaded SrTi0.8Mn0.2O3 proceeded primarily via the MvK mechanism with a partial contribution from the Langmuir–Hinshelwood mechanism. This study underscores the effectiveness of combining metal and MvK‐type catalysts to enhance the efficiency of the RWGS reaction.

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Oxygen Storage Characteristics and Redox Behaviors of Lanthanum Perovskite Oxides with Transition Metals in the B-Sites

Cited by 8 publications

References 70 publications

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Manganese‐Based Composite‐Structure Cathode Materials for Sustainable Batteries

Promoting Effect of Pd Nanoparticles on SrTi_0.8Mn_0.2O₃ in the Reverse Water‐Gas Shift Reaction via the Mars–Van Krevelen Mechanism

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Oxygen Storage Characteristics and Redox Behaviors of Lanthanum Perovskite Oxides with Transition Metals in the B-Sites

Cited by 8 publications

References 70 publications

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Ni-BaMnO3 Perovskite Catalysts for NOx-Assisted Soot Oxidation: Analyzing the Effect of the Nickel Addition Method

Manganese‐Based Composite‐Structure Cathode Materials for Sustainable Batteries

Promoting Effect of Pd Nanoparticles on SrTi0.8Mn0.2O3 in the Reverse Water‐Gas Shift Reaction via the Mars–Van Krevelen Mechanism

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Product

Resources

About

Promoting Effect of Pd Nanoparticles on SrTi_0.8Mn_0.2O₃ in the Reverse Water‐Gas Shift Reaction via the Mars–Van Krevelen Mechanism