Effect of the A-site cation over spinel AMn2O4 (A = Cu2+, Ni2+, Zn2+) for toluene combustion: Enhancement of the synergy and the oxygen activation ability

Zhang, Yongzhao; Zeng, Zequan; Li, Yifan; Hou, Yaqin; Hu, Jiangliang; Huang, Zhanggen

doi:10.1016/j.fuel.2020.119700

Cited by 56 publications

(25 citation statements)

References 55 publications

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“…For instance, CuMn 2 O 4 has showed optimal toluene oxidation activity, with a high conversion of toluene (up to 90.0%) at 205 °C. 41 It has been also applied in the catalytic steam reforming of methanol 42 and preferential oxidation processes, 43 with high selectivity and moderate activity at temperatures over 100 °C. It is believed that the first row of transition metal oxide-based electrocatalysts used for electrochemical oxidation of biomass is highly feasible.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Thus, a Cu–Mn spinel (CuMn 2 O 4 ) has been investigated as a high-performance catalyst for chemical oxidation reactions. For instance, CuMn 2 O 4 has showed optimal toluene oxidation activity, with a high conversion of toluene (up to 90.0%) at 205 °C . It has been also applied in the catalytic steam reforming of methanol and preferential oxidation processes, with high selectivity and moderate activity at temperatures over 100 °C.…”

Section: Introductionmentioning

confidence: 99%

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Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Zhu

Qin

et al. 2021

ACS Sustainable Chem. Eng.

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Electrocatalytic biomass valorization with renewable energy input represents a promising way to produce sustainable and non-fossil-based carbon products. The oxidative production of furandicarboxylic acid (FDCA) from bio-based 5-hydroxymethylfurfural (HMF) has attracted one of the most attention. Herein, spinel CuMn2O4 with an urchin-like nanostructure was synthesized by a hydrothermal method and subsequently soaked in ammonia water to create oxygen vacancies. The as-prepared material was used as an efficient electrocatalyst to oxidize HMF to FDCA. It was confirmed that CuMn2O4 etched with ammonia has an excellent electrocatalytic performance: at a current density of 20 mA/cm2, the potential of HMF oxidation was 1.31 V vs RHE in 1.0 M KOH solution with 10 mM HMF prior to the takeoff of the competing reaction, O2 evolution. Long-term chronoamperometry demonstrated that a 100% conversion of HMF and a 96% Faradaic efficiency of yield of FDCA were achieved. Our results indicated that it is feasible to employ the earth-abundant transition metal-based electrocatalyst CuMn2O4 to selectively oxidize biomass with higher energy conversion efficiency than water splitting as well as to produce valuable products in a H-type electrochemical cell.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Zhu

Qin

et al. 2021

ACS Sustainable Chem. Eng.

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“…Double promotion has a clear beneficial effect on the catalytic activity in the toluene combustion. In a narrow temperature window (up to B electronegativity of copper promotes the electron transfer from manganese, and the redox cycle of Cu 2+ /Cu + activating oxygen appears [66]. The formed oxygen vacancies, which facilitate adsorption of oxygen species, remain stable on the surface of active phase above 275 °C [67].…”

Section: Catalytic Activity Of the Cu-mn/bea Catalysts In Vocs Combustionmentioning

confidence: 99%

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

Rokicińska

Majerska

Drozdek

et al. 2021

Applied Surface Science

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Dealuminated BEA zeolite (SiBEA) was chosen as a support of metal oxide(s) phase for catalytic combustion of volatile organic compounds (VOCs). Copper and/or manganese oxide(s) were deposited at various Cu/Mn molar ratios. Factors influencing the catalytic activity were found by chosen physicochemical methods, including XRD, XRF, lowtemperature N 2 adsorption, FT-IR, UV-Vis-DRS, STEM-EDX, XPS and H 2 -TPR. Depending on the chemical composition, CuO, (Cu x Mn 3-x ) 1-δ O 4 , Cu-doped Mn 3 O 4 or Mn 2 O 3 was formed as the dominant phase. The active phase particles were located mainly in the interparticle voids of the zeolite support. SiBEA gained Lewis acid sites after the introduction of the metal oxide phase, especially in the case of CuO deposition. The presence of copper in the catalytic system resulted in enhanced reducibility of the active phase, and in a consequence in high catalytic activity in the total oxidation of aromatic VOCs, which proceeds according to the Mars-van Krevelen mechanism. After the introduction of Mn, the co-existence of different valence forms was found due to the redox equilibrium: Cu 2+ + Mn 3+ = Cu + + Mn 4+ .

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“…Among them, the catalyst with a porous hollow hierarchical structure exhibited the best performance because of abundant oxygen vacancies. Zhang et al used KIT-6 as the hard template to prepare a series of AMn 2 O 4 (A = Zn, Ni, and Cu) spinel catalysts for toluene oxidation. The enhanced catalytic activity was attributed to the large specific surface area and active chemisorption of oxygen species.…”

Section: Introductionmentioning

confidence: 99%

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Shan

Zhang

Zhao

et al. 2022

Environ. Sci. Technol.

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Surface lattice oxygen is crucial to the degradation of volatile organic compounds (VOCs) over transition metal oxides according to the Mars–van Krevelen mechanism. Herein, λ-MnO2 in situ grown on the surface of CoMn spinel was prepared by acid etching of corresponding spinel catalysts (CoMn-Hx-Ty) for VOC oxidation. Experimental and relevant theoretical exploration revealed that acid etching on the CoMn spinel surface could decrease the electron cloud density around the O atom and weaken the adjacent Mn–O bond due to the fracture of the surface Co–O bond, facilitating electron transfer and subsequently the activation of surface lattice oxygen. The obtained CoMn-H1-T1 exhibited an excellent catalytic performance with a 90% acetone conversion at 149 °C, which is 42 °C lower than that of CoMn spinel. Furthermore, the partially maintained spinel structure led to better stability than pure λ-MnO2. In situ diffuse reflectance infrared Fourier transform spectroscopy confirmed a possible degradation pathway where adsorptive acetone converted into formate and acetate species and into CO2, in which the consumption of acetate was identified as the rate-limiting step. This strategy can improve the catalytic performance of metal oxides by activating surface lattice oxygen, to broaden their application in VOC oxidation.

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Effect of the A-site cation over spinel AMn2O4 (A = Cu2+, Ni2+, Zn2+) for toluene combustion: Enhancement of the synergy and the oxygen activation ability

Cited by 56 publications

References 55 publications

Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

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Effect of the A-site cation over spinel AMn2O4 (A = Cu2+, Ni2+, Zn2+) for toluene combustion: Enhancement of the synergy and the oxygen activation ability

Cited by 56 publications

References 55 publications

Ammonia Etching to Generate Oxygen Vacancies on CuMn2O4 for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Ammonia Etching to Generate Oxygen Vacancies on CuMn2O4 for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

Acid Etching-Induced In Situ Growth of λ-MnO2 over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

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Product

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Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Ammonia Etching to Generate Oxygen Vacancies on CuMn₂O₄ for Highly Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation