Oxygen defect, electron transfer and photocatalytic activity of Ag/CeO2/SBA-15 hybrid catalysts

Chen, L.F.; Arellano, U.; Wang, J.A.; Balcázar, Luz M.; Sotelo, Rogelio; Solís, S.; Azomosa, Maximiliano; González, Julia García; Vargas, Óscar; Song, Yue; Liu, J.; Zhou, Xinggui

doi:10.1016/j.cattod.2021.10.014

Cited by 13 publications

(2 citation statements)

References 41 publications

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“…According to refs. [28][29][30][31], the signal at about 270-340 nm corresponds to the O 2− → Ce 4+ charge transfer transition in CeO2. The position of the absorption maximum depends on the presence of Ce 3+ , as well as on the morphologic characteristics of particles.…”

Section: Uv-vis Diffuse Reflectance Spectroscopy (Uv-vis Drs) and Ram...mentioning

confidence: 99%

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Grabchenko,

Dorofeeva,

Svetlichnyi

et al. 2023

Nanomaterials

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Dry reforming of methane with ratio CH4/CO2 = 1 is studied using supported Ni catalysts on SBA-15 modified by CeMnOx mixed oxides with different Ce/Mn ratios (0.25, 1 and 9). The obtained samples are characterized by wide-angle XRD, SAXS, N2 sorption, TPR-H2, TEM, UV–vis and Raman spectroscopies. The SBA-15 modification with CeMnOx decreases the sizes of NiO nanoparticles and enhances the NiO–support interaction. When Ce/Mn = 9, the NiO forms small particles on the surface of large CeO2 particles and/or interacts with CeO2, forming mixed phases. The best catalytic performance (at 650 °C, CH4 and CO2 conversions are 51 and 69%, respectively) is achieved over the Ni/CeMnOx/SBA-15 (9:1) catalyst. The peculiar CeMnOx composition (Ce/Mn = 9) also improves the catalyst stability: In a 24 h stability test, the CH4 conversion decreases by 18 rel.% as compared to a 30 rel.% decrease for unmodified catalyst. The enhanced catalytic stability of Ni/CeMnOx/SBA-15 (9:1) is attributed to the high concentration of reactive peroxo (O−) and superoxo (O2−) species that significantly lower the amount of coke in comparison with Ni-SBA-15 unmodified catalyst (weight loss of 2.7% vs. 42.2%). Ni-SBA-15 modified with equimolar Ce/Mn ratio or Mn excess is less performing. Ni/CeMnOx/SBA-15 (1:4) with the highest content of manganese shows the minimum conversions of reagents in the entire temperature range (X(CO2) = 4–36%, X(CH4) = 8–58%). This finding is possibly attributed to the presence of manganese oxide, which decorates the Ni particles due to its redistribution at the preparation stage.

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Section: Uv-vis Diffuse Reflectance Spectroscopy (Uv-vis Drs) and Ram...mentioning

confidence: 99%

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Grabchenko,

Dorofeeva,

Svetlichnyi

et al. 2023

Nanomaterials

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“…In the present work, a series of CeO2/SBA-15 nanomaterials were synthesized using the impregnation method and were characterized by the N2 physisorption, X-ray diffraction, the Rietveld refinements, Xray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) techniques, with the aim of determining their defective structures and the possibility of CeO2 to disperse within the pores of SAB-15. These materials with structural defects will be of great interest in the areas of catalysis, semiconductors, and solid state fuel cells [8][9][10]. When ceria was supported on SBA-15, the dispersed ceria nanocrystals may differ from the bulk ceria, leading to reduction of the expensive ceria amount in the catalyst design and the creation of defective structure in ceria.…”

Section: Introductionmentioning

confidence: 99%

Crystalline structure, oxygen defects and textural properties of the CeO₂/SBA-15 nanomaterials

González

Chen²,

Wang³

2022

J. Phys.: Conf. Ser.

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In this study, a series of CeO2/SBA-15 nanomaterials were synthesized by varying the CeO2 content. These materials were characterized by different techniques to determine their textural, surface chemical and crystalline properties. Crystallite size and oxygen defects were determined by Microanalysis Using X-Ray Diffraction (MAUD) software based on the Rietveld refinement method. The results showed that the crystallite size slightly increased from 5.6 to 8.4 nm and the surface area decreased from 620 to 370 m2/g as CeO2 content increased from 5 to 10, 15 to 20wt%. The oxygen occupancy that was associated with oxygen defects was found in the crystalline structure of CeO2. The defect concentration was between 6.18 and 14.42%, depending on the ceria content and dispersion. This study confirmed that the CeO2/SBA-15 nanomaterials have larger surface area, highly dispersed CeO2 nanoparticles, and a big number of oxygen defects in the crystalline structure, which can be used in different catalytic reactions.

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Experimental study on Ag-modified CeO2 as the catalyst for soot oxidation

Fang,

Yi,

et al. 2023

J Therm Anal Calorim

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Oxygen defect, electron transfer and photocatalytic activity of Ag/CeO2/SBA-15 hybrid catalysts

Cited by 13 publications

References 41 publications

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Crystalline structure, oxygen defects and textural properties of the CeO₂/SBA-15 nanomaterials

Experimental study on Ag-modified CeO2 as the catalyst for soot oxidation

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Oxygen defect, electron transfer and photocatalytic activity of Ag/CeO2/SBA-15 hybrid catalysts

Cited by 13 publications

References 41 publications

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Ni-Based SBA-15 Catalysts Modified with CeMnOx for CO2 Valorization via Dry Reforming of Methane: Effect of Composition on Modulating Activity and H2/CO Ratio

Crystalline structure, oxygen defects and textural properties of the CeO2/SBA-15 nanomaterials

Experimental study on Ag-modified CeO2 as the catalyst for soot oxidation

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Crystalline structure, oxygen defects and textural properties of the CeO₂/SBA-15 nanomaterials