Copper oxide catalyst supported on niobium oxide for CO oxidation at low temperatures

Leung, Emi; Shimizu, Akiko; Barmak, K.; Farrauto, Robert J.

doi:10.1016/j.catcom.2017.04.008

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…However, as previously reported, the valence states related to Cu 0 and Cu + are hard to distinguish through Cu 2p 3/2 analysis in XPS due to their similar binding energies (±0.1 eV). , Thus, Cu LMM Auger features are presented in Figure S4. The observed peaks are characteristic of Cu 1+ and Cu 2+ , excluding the formation of Cu 0 (919 eV) in the surface of the as-prepared catalysts. − In this work, a peak at around 937.5 eV is observed, displaying a remarkably higher binding energy than that in literature. Such a shift explains the strong interaction between CuO and the Ce–Al support (to form Cu 2+ -O 2– -Ce 4+ species) due to the charge transfer from the metal ion toward the support matrix. , This peak has been reported and ascribed to Cu 2+ bonded with oxygen species from the support (Cu–O–Ce) previously in literature. − Indeed, the formed electronic Cu–Ce interaction can introduce more oxygen vacancies, which has been claimed to have positive effect on CO 2 adsorption and activation, opening an effective reaction pathway for the CO 2 hydrogenation. , Therefore, proportions of Cu 2p 3/2 species are quantitively given in Table .…”

Section: Resultsmentioning

confidence: 43%

Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Yang

Pastor‐Pérez

Villora-Picó

et al. 2021

ACS Sustainable Chem. Eng.

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The reverse water–gas shift reaction (RWGS) reaction represents a direct route for CO2 conversion whose selectivity significantly depends on the selected catalyst. In this work, a new family of bimetallic iron–copper oxide catalysts supported on ceria-alumina with various Fe/Cu oxides ratios were investigated for the RWGS reaction. Additionally, bare Fe-based and Bare Cu-based catalysts were synthesized for comparison. Our results demonstrate that the developed bimetallic Fe–Cu catalysts present a remarkable enhancement of catalytic performance when compared to monometallic systems, especially at the so-called “low-temperature range” for RWGS. Characterization results evidence that Cu species undergo different states on the catalytic surface during the reaction, wherein the formed metallic Cu is linked to the catalytic activity via the strength of the interaction with the multioxide phases, such as Fe3O4/CeO2, while the copper-dopped ceria could contribute to the promotion of CO selectivity. Besides, we identify that the Fe/Cu oxides mass ratio of 0.25/0.75 is an optimal formulation rendering highly commendable CO2 conversion levels at 450 °C with excellent selectivity and stability for long-term runs. Very importantly, without preactivation, our multicomponent materials still display an optimum performance which have a potential realistic application from cost perspective than other Cu-based catalysts. Overall, this work showcases a strategy to design highly effective multicomponent Fe–Cu catalysts for CO2 conversion via RWGS.

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Section: Resultsmentioning

confidence: 43%

Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Yang

Pastor‐Pérez

Villora-Picó

et al. 2021

ACS Sustainable Chem. Eng.

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“…Alternative materials to Pt-group metals such as Ni, Co, Cu, and Au have been widely considered as candidates of the key components of catalytic converters for polluted atmospheres. − Some of these cost-effective materials (in the form of nanoparticles less than ∼5 nm in diameter) can be as efficient as Pt group-based catalysts for the total oxidation of volatile organic compounds. ,,− However, these catalytically active nanoparticles exhibit lower thermal stability and therefore easily agglomerate into larger particles, losing the effective surface area and catalytic activity within a short time.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Oxidative Desorption of Acetaldehyde over Mesoporous Fe_xO_yH_z/Al₂O₃

Jeong

Kim

et al. 2019

ACS Omega

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Fe x O y H z nanostructures were incorporated into commercially available and highly porous alumina using the temperature-regulated chemical vapor deposition method with ferrocene as an Fe precursor and subsequent annealing. All processes were conducted under ambient pressure conditions without using any high-vacuum equipment. The entire internal micro- and mesopores of the Al 2 O 3 substrate with a bead diameter of ∼2 mm were evenly decorated with Fe x O y H z nanoparticles. The Fe x O y H z /Al 2 O 3 structures showed substantially high activity for acetaldehyde oxidation. Most importantly, Fe x O y H z /Al 2 O 3 with a high surface area (∼200 m 2 /g) and abundant mesopores was found to uptake a large amount of acetaldehyde at room temperature, and subsequent thermal regeneration of Fe x O y H z /Al 2 O 3 in air resulted in the emission of CO 2 with only a negligibly small amount of acetaldehyde because Fe x O y H z nanoparticles can catalyze total oxidation of adsorbed acetaldehyde during the thermal treatment. Increase in the humidity of the atmosphere decreased the amount of acetaldehyde adsorbed on the surface due to the competitive adsorption of acetaldehyde and water molecules, although the adsorptive removal of acetaldehyde and total oxidative regeneration were verified under a broad range of humidity conditions (0–70%). Combinatory use of room-temperature adsorption and catalytic oxidation of adsorbed volatile organic compounds using Fe x O y H z /Al 2 O 3 can be of potential application in indoor and outdoor pollution treatments.

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“…Furthermore, supported catalysts are deposited (as washcoats) on high cell density monoliths (ceramic and metal) to minimize pressure drop and volume relative to packed beds [2]. Niobium pentoxide (Nb 2 O 5 ) has been reported to show strong metal support interaction (SMSI) with certain metals [1,10,11]. However, no commercial VOC applications that include Nb 2 O 5 are known.…”

Section: Introductionmentioning

confidence: 99%

“…An active low-temperature oxidation catalyst has attracted immense attention to meet ever-changing stringent environmental regulations for oxidation of volatile organic compounds in chemical plants, petroleum refineries, pharmaceutical plants, automobile manufacturing, etc. [1,2].…”

Section: Introductionmentioning

confidence: 99%

Catalysts Promoted with Niobium Oxide for Air Pollution Abatement

et al. 2017

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Pt-containing catalysts are currently used commercially to catalyze the conversion of carbon monoxide (CO) and hydrocarbon (HC) pollutants from stationary chemical and petroleum plants. It is well known that Pt-containing catalysts are expensive and have limited availability. The goal of this research is to find alternative and less expensive catalysts to replace Pt for these applications. This study found that niobium oxide (Nb 2 O 5 ), as a carrier or support for certain transition metal oxides, promotes oxidation activity while maintaining stability, making them candidates as alternatives to Pt. The present work reports that the orthorhombic structure of niobium oxide (formed at 800 • C in air) promotes Co 3 O 4 toward the oxidation of both CO and propane, which are common pollutants in volatile organic compound (VOC) applications. This was a surprising result since this structure of Nb 2 O 5 has a very low surface area (about 2 m 2 /g) relative to the more traditional Al 2 O 3 support, with a surface area of 150 m 2 /g. The results reported demonstrate that 1% Co 3 O 4 /Nb 2 O 5 has comparable fresh and aged catalytic activity to 1% Pt/γ-Al 2 O 3 and 1% Pt/Nb 2 O 5 . Furthermore, 6% Co 3 O 4 /Nb 2 O 5 outperforms 1% Pt/Al 2 O 3 in both catalytic activity and thermal stability. These results suggest a strong interaction between niobium oxide and the active component-cobalt oxide-likely by inducing an oxygen defect structure with oxygen vacancies leading to enhanced activity toward the oxidation of CO and propane.

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Copper oxide catalyst supported on niobium oxide for CO oxidation at low temperatures

Cited by 17 publications

References 25 publications

Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Adsorption and Oxidative Desorption of Acetaldehyde over Mesoporous Fe_xO_yH_z/Al₂O₃

Catalysts Promoted with Niobium Oxide for Air Pollution Abatement

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Copper oxide catalyst supported on niobium oxide for CO oxidation at low temperatures

Cited by 17 publications

References 25 publications

Highly Active and Selective Multicomponent Fe–Cu/CeO2–Al2O3 Catalysts for CO2 Upgrading via RWGS: Impact of Fe/Cu Ratio

Highly Active and Selective Multicomponent Fe–Cu/CeO2–Al2O3 Catalysts for CO2 Upgrading via RWGS: Impact of Fe/Cu Ratio

Adsorption and Oxidative Desorption of Acetaldehyde over Mesoporous FexOyHz/Al2O3

Catalysts Promoted with Niobium Oxide for Air Pollution Abatement

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Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Highly Active and Selective Multicomponent Fe–Cu/CeO₂–Al₂O₃ Catalysts for CO₂ Upgrading via RWGS: Impact of Fe/Cu Ratio

Adsorption and Oxidative Desorption of Acetaldehyde over Mesoporous Fe_xO_yH_z/Al₂O₃