Novel CuO-containing catalysts based on ZrO2 hollow spheres for total oxidation of toluene

Kondratowicz, Tomasz; Drozdek, Marek; Rokicińska, Anna; Natkański, Piotr; Michalík, Marek; Kuśtrowski, Piotr

doi:10.1016/j.micromeso.2019.01.031

Cited by 27 publications

(18 citation statements)

References 70 publications

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“…Volatile organic compounds (VOCs) are air pollutants produced by industrial productions, which are harmful to humans’ health and have caused a lot of severe environmental problems. , Because of the harmful effect they bring, how to control their emission is an urgent problem to be solved today. Catalytic combustion is an economical, effective, and friendly way to reduce VOC pollution, for which an efficient catalyst is the key issue. − Precious metal catalysts like supported Pd, − Pt, − and Au − possess superior low-temperature catalytic activity and good life span, but the scarce resources and the expensive price have limited their large-scale applications. Therefore, transition-metal oxide-based catalysts, such as CeO 2 , − CoOx, − CuO, , and MnO X , , have been extensively explored by researchers for VOC combustion over past several decades due to their much lower cost and good activity.…”

Section: Introductionmentioning

confidence: 99%

Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation

Liang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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To elucidate the nature and states of the surface oxygen sites on SnO2 and the relationship between the surface vacancies and the active oxygen sites, a series of SnO2 samples have been fabricated by microwave/ultrasound and KCC-1 hard template. By adjusting the preparation methods, SnO2 samples with varied surface and texture properties were obtained, which display different intrinsic activities for toluene deep oxidation, following the sequence SnO2-Ultra-OH > SnO2-Stir-OH > SnO2-Mic > SnO2-Pre. For the first time, it is discerned clearly with in situ diffuse reflectance infrared Fourier transform spectroscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance techniques that both superoxide O2 – and peroxide O2 2– anions are present on SnO2 surface as active oxygen species. Generally, these more active SnO2 samples possess richer surface active O2 –, O2 2– anions and acidic sites. The concerted interaction between surface O2 –, O2 2– anions and acidic sites is concluded to be the predominant reason determining the toluene total oxidation activity over SnO2.

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Section: Introductionmentioning

confidence: 99%

Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation

Liang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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“…Moreover, the conversion temperature over La 0.08 MnO x with H 2 O is much lower than that over most composite metal oxide catalysts under the same reaction conditions. 37,38 The most likely cause of activity decrease is that water temporarily occupies the active sites on the catalyst surface, competitively adsorbs with toluene hindering the activation of oxygen. 36 3.6.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Catalytic Oxidation of Toluene over Manganese Oxide Modified by Lanthanum with a Coral-Like Hierarchical Structure Nanosphere

Zhang

Fan

et al. 2021

ACS Appl. Mater. Interfaces

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Coral-like lanthanum manganese oxides (La y MnO x ) with a hierarchical structure nanosphere were successfully prepared using a simple method, which presented a high-efficiency catalytic performance for toluene combustion. Among them, La 0.08 MnO x with the Mn 3 O 4 phase exhibits superior catalytic activity, such as a lower T 95 value (218 °C), excellent H 2 O resistance, and catalytic stability. The effects of La addition on the bulk and surface physicochemical properties of La y MnO x were investigated by sorts of characterization including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 adsorption− desorption, temperature-programmed reduction with H 2 , temperature-programmed desorption of O 2 , X-ray photoelectron spectroscopy, and so forth. The results demonstrate that the doping of La can induce the variation of physicochemical properties and the formation of more surface oxygen species and high valence state amorphous manganese oxides, improving low-temperature reducibility, which facilitates good catalytic activity for La 0.08 MnO x . A series of in situ diffuse reflectance infrared Fourier transform spectroscopy experiments for toluene adsorption were performed on the La 0.08 MnO x catalyst pretreated under different atmosphere conditions to investigate the role of oxygen species and the reaction processes. The results indicate that the abundant surface oxygen species over La 0.08 MnO x can make the rapid formation of benzoic acid species, further transfer into CO 2 and H 2 O, which is considered as the key factor in the activation and oxidation of toluene.

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“…7A). In the Cu 2p 3/2 region of the Cu10SiBEA and Cu8Mn2SiBEA catalysts, two peaks at 932.8 ± 0.1 eV and 935.0 ± 0.3 eV (attributed to Cu 2+ ions surrounded by O 2and OHions, respectively) with very intense satellite features at ~942 eV and 944 eV are found [58]. An increase in the Mn content results in a gradual decrease in the number of superficial hydroxyl-bound Cu 2+ species (Fig.…”

Section: Coordination Of Transition Metal Active Sites In the Cu-mn/bea Catalystsmentioning

confidence: 90%

“…An increase in the Mn content leads to widening of this band as well as a loss of its intensity. Obviously, the Mn-containing species are not so highly ordered as copper-containing ones, which may be due to the presence of many low UV-vis-DR spectrum of Cu10SiBEA shows a wide band centered at 820 nm, which can be attributed to the 2 E g → 2 T 2g spin-allowed transitions of Cu 2+ cations situated in the distorted octahedral symmetry of CuO [58]. For the samples with coexisting Mn, another band is distinguished at ca.…”

Section: Coordination Of Transition Metal Active Sites In the Cu-mn/bea Catalystsmentioning

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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Novel CuO-containing catalysts based on ZrO2 hollow spheres for total oxidation of toluene

Cited by 27 publications

References 70 publications

Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation

Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation

Enhanced Catalytic Oxidation of Toluene over Manganese Oxide Modified by Lanthanum with a Coral-Like Hierarchical Structure Nanosphere

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

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Novel CuO-containing catalysts based on ZrO2 hollow spheres for total oxidation of toluene

Cited by 27 publications

References 70 publications

Identifying Surface Active Sites of SnO2: Roles of Surface O2–, O22– Anions and Acidic Species Played for Toluene Deep Oxidation

Identifying Surface Active Sites of SnO2: Roles of Surface O2–, O22– Anions and Acidic Species Played for Toluene Deep Oxidation

Enhanced Catalytic Oxidation of Toluene over Manganese Oxide Modified by Lanthanum with a Coral-Like Hierarchical Structure Nanosphere

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

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Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation

Identifying Surface Active Sites of SnO₂: Roles of Surface O₂^–, O₂^2– Anions and Acidic Species Played for Toluene Deep Oxidation