Promotional effect and mechanism study of nonmetal-doped Cr/CexTi1−xO2 for NO oxidation: tuning O2 activation and NO adsorption simultaneously

Zhong, Lei; Zhong, Qin; Cai, Wei; Zhang, Shen; Yu, Yang; Ou, Man; Song, Fujiao

doi:10.1039/c6ra01928e

Cited by 8 publications

(6 citation statements)

References 64 publications

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“…In brief, IR bands seen at 510 cm –1 could be ascribed to Ce–O stretching vibration, whereas those located around 870 and 1058 cm –1 represents the stretching and bending vibration of intercalated C–O species present in the precursor . Further, the vibrational band appearing at 1350 cm –1 is due to the N–O stretching band . This confirms the presence of N atom in the lattice of the CeO 2 crystal.…”

Section: Resultsmentioning

confidence: 91%

“…Moreover, a broad IR band within the range of 3400−3500 cm −1 is because of the O−H group, which shows the stretching vibration of absorbed water on the surface of the cerium oxide nanoparticles. 54 The presence of nitrogen atom in the CeO 2 skeleton is well aided by EDX and elemental mapping analyses.…”

Section: ■ Oxygen Evolution and •Oh Generationmentioning

confidence: 91%

“…53 Further, the vibrational band appearing at 1350 cm −1 is due to the N−O stretching band. 54 This confirms the presence of N atom in the lattice of the CeO 2 crystal. Again, the IR peak positioned at 1610 cm −1 is basically associated with the molecular H 2 O (H−O−H) bending frequency.…”

Section: ■ Oxygen Evolution and •Oh Generationmentioning

confidence: 99%

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A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

et al. 2020

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Lethargic kinetics is the foremost bottleneck of the photocatalytic water oxidation reaction. Hence, in this respect, the CeO 2 coral reef made up of nanosheets is studied focusing on the oxygen vacancy that affects the water oxidation reaction. First, CeO 2 was prepared in an oyster shell/crucible with the presence/absence of urea by a simple calcination technique to tune the oxygen vacancy. More oxygen vacancy was detected in CeO 2 prepared from urea and oyster shell, which is evidenced from Raman and PL analyses. Further, the oyster shell-treated sample was found to be of nanosheet type with numerous pores as observed via TEM analysis. The theoretical approach was adopted to expose the role of oxygen vacancies and the fate of scavenging agents in the water oxidation mechanism. It was observed that an oxygen vacancy plays a vital role in minimizing the activation energy hump and opposes the reverse reaction. The apparent conversion efficiency of 7.1% is calculated for the oxygen evolution reaction. Oxygen vacancy, quantum confinement effect, and charge separation efficiency are mainly responsible for the better photocatalyzed water oxidation reaction and hydroxyl radical production. This investigation will help in providing valuable information toward designing cost-effective oxygen vacancy-oriented nanosheet systems and the importance of vacancy in the water-splitting reaction.

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Section: Resultsmentioning

confidence: 91%

Section: ■ Oxygen Evolution and •Oh Generationmentioning

confidence: 91%

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A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

et al. 2020

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“…The bands at 1700-1300 cm -1 are associated to the N-C stretching modes, which are caused by the different doping level [39]. The bands at 1200-1600 cm -1 were slightly stronger, indicating that a few of the Lewis acid sites were occupied by bridging nitrate species [40].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 98%

Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

Yadav

Kavaiya

Mohan

et al. 2017

Bull. Chem. React. Eng. Catal.

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The 15 mol% Cu/Al2O3 catalysts with different Mn doping (0.5, 1.0, 1.5, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method. Calcination of precursors were performed in flowing air conditions at 500 ºC. The catalysts were characterized by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N2 physisorption. The catalysts activities were evaluated for H2 assisted LPG-SCR of NO in a packed bed tubular flow reactor with 200 mg catalyst under the following conditions: 500 ppm NO, 8 % O2, 1000 ppm LPG, 1 % H2 in Ar with total flow rate of 100 mL/min. Characterization of the catalysts revealed that surface area of 45.6-50.3 m 2 /g, narrow pore size distribution (1-2 nm), nano-size crystallites, Cu 2+ and Mn 2+ phases were principal active components. Hydrogen enhanced significantly selective reduction of NO to N2 with LPG over 1.0 mol % Mn-Cu/Al2O3 giving 95.56 % NO reduction at 150 ºC. It was proposed that the synergistic interaction between H2 and LPG substantially widened the NO reduction temperature window and a considerable increase in both activity and selectivity. Negligible loss of catalyst activity was observed for the 50 h of stream on run experiment at 150 ºC. The narrow pore size distribution, thermal stability of the catalyst and optimum Mn doping ensures good dispersion of Cu and Mn over Al2O3 that improved NO reduction in H2-LPG SCR system.

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“…33,34 Only one region could be detected for the O 1s spectra. And it could be deconvoluted into two main peaks represent lattice oxygen O a and chemisorbed oxygen O b , 35,36 respectively. The specic binding energy of Mn and oxygen species were shown in Tables 3 and 4.…”

Section: Surface Atom Statementioning

confidence: 99%

Catalyst tolerance to SO₂and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

et al. 2017

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Promotional effect and mechanism study of nonmetal-doped Cr/Ce_xTi_1−xO₂ for NO oxidation: tuning O₂ activation and NO adsorption simultaneously

Abstract: Nonmetal-doped Cr/CexTi1−xO2 was conductive to tune O2 activation and NO adsorption strength simultaneously. Moreover, the catalytic mechanism was investigated for NO oxidation.

Cited by 8 publications

References 64 publications

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

Catalyst tolerance to SO₂and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

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Promotional effect and mechanism study of nonmetal-doped Cr/CexTi1−xO2 for NO oxidation: tuning O2 activation and NO adsorption simultaneously

Abstract: Nonmetal-doped Cr/CexTi1−xO2 was conductive to tune O2 activation and NO adsorption strength simultaneously. Moreover, the catalytic mechanism was investigated for NO oxidation.

Cited by 8 publications

References 64 publications

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO2 Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO2 Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

Catalyst tolerance to SO2and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

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Promotional effect and mechanism study of nonmetal-doped Cr/Ce_xTi_1−xO₂ for NO oxidation: tuning O₂ activation and NO adsorption simultaneously

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

A Mechanistic Approach on Oxygen Vacancy-Engineered CeO₂ Nanosheets Concocts over an Oyster Shell Manifesting Robust Photocatalytic Activity toward Water Oxidation

Catalyst tolerance to SO₂and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone