Composite H3PW12O40–TiO2 catalysts for toluene selective photo-oxidation

Bertolini, G.; Pizzio, Luis R.; Kubacka, Anna; Muñoz‐Batista, Mario J.; Fernández-García, Marcos

doi:10.1016/j.apcatb.2017.11.055

Cited by 63 publications

(18 citation statements)

References 46 publications

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“…In summary, the XRD and TEM analyses indicate, as can be expected, that the major and highly crystalline anatase phase dominates the structural, morphological and surface properties of the composite samples. We note that the deposition of the NiMo 6 component at the anatase surface would favor its stabilization, as it has been previously mentioned in the literature for other POMs [24][25][26]. Information about the NiMo component of composite samples is obtained with the help of SEM-XEDS.…”

Section: Characterization Results Of Initial Samplesmentioning

confidence: 87%

Novel (NH4)4[NiMo6O24H6]·5H2O – TiO2 composite system: Photo-oxidation of toluene under UV and sunlight-type illumination

Muñoz‐Batista

Bertolini

Cabello

et al. 2018

Applied Catalysis B: Environmental

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A series of composite materials based on titania and growing quantities of the (NH 4 ) 4 [NiMo 6 O 24 H 6 ]•5H 2 O heteropolyacid (NiMo 6 HPA) was tested in the gas-phase toluene photo-oxidation reaction. Materials were characterized with the help of chemical analysis, X-ray diffraction, porosimetry, electron transmission and scanning microscopies, as well as X-ray photoelectron and UV-visible diffuse-reflectance spectroscopies. Photoactivity performance was assessed under UV and sunlight-type illumination conditions through the calculation of the true quantum efficiency to measure activity as well as the analysis of the selectivity of the reaction. The composite system having a 3 wt. % of the NiMo 6 component presents improved performance with respect to well defined titania references (parent nanosized anatase or P25) under all illumination conditions tested. The characterization of the solids indicates that the NiMo 6 component supported on titania suffers a significant modification of its physico-chemical properties as a function of the loading of the composite system. Such modification appears as a consequence of the interface interaction between the components of the composite system. An electron paramagnetic resonance study of the radical species formed under illumination shows that charge handling through the NiMo 6 -TiO 2 interface controls the photo-catalytic properties.

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Section: Characterization Results Of Initial Samplesmentioning

confidence: 87%

Novel (NH4)4[NiMo6O24H6]·5H2O – TiO2 composite system: Photo-oxidation of toluene under UV and sunlight-type illumination

Muñoz‐Batista

Bertolini

Cabello

et al. 2018

Applied Catalysis B: Environmental

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“…The other reaction product (not shown in the Figure 5) corresponded to the complete mineralization of the alcohol (CO2). The production of the total oxidation product requires a significantly larger number of charge carriers and energetic photons, (Bertolini et al, 2018) which are likely less available in the amorphous Fe/CN composite sample. This could partially explain the selectivity data; 70% benzaldehyde selectivity for Fe/CN sample.…”

Section: 2catalytic Resultsmentioning

confidence: 99%

Facile mechanochemical modification of g-C3N4 for selective photo-oxidation of benzyl alcohol

Cerdan

Ouyang

Colmenares

et al. 2019

Chemical Engineering Science

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Graphitic carbon nitride enriched with ZnO or Fe2O3 were synthesized using a simple one-pot mechanochemical method. By using this method, composite samples were synthetized without the production of any potentially hazardous waste. The synthesized materials were used as catalysts during the selective photo-oxidation of benzyl alcohol. Both composite materials displayed an enhancement of the activity and benzaldehyde selectivity with respect to the pure g-C3N4. The most active catalyst was Fe2O3/g-C3N4. The conversion and benzaldehyde selectivity of this sample were 20 and 70 %, respectively. It showed a considerable increase of the benzaldehyde selectivity compared to the pure g-C3N4 and TiO2 P25 commercial reference. A complete structural and electronic characterization using Scanning Electron Microscopy-Energy Dispersive (SEM-EDX), BET measurements, X-ray diffraction (XRD), X-ray Photoelectron (XPS), and UV-visible spectroscopies was carried out. The characterization analysis pointed out the leading role of the crystallinity and surface concentration over the activity and benzaldehyde selectivity of the reaction.

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“…Notably, these active species could, under green and mild conditions, participate in a variety of organic reactions, including hydrogenation 5,6 , epoxidation 7,8 , alcohol oxidation 9,10 , selective oxidation of aromatic compounds 11,12 , and even some reactions that are rather challenging in thermal catalysis. Yet still, currently for heterogeneous photocatalysts, there exist the common issues of rapid recombination of photocarriers and the resulting low e ciency of carrier separation and utilization, which would hamper the high-performance catalysis of sophisticated organic reactions, and thus their applications have so far been limited primarily to environment-related aspects such as degradation of organics, air puri cation and water photolysis [13][14][15][16][17] . A strategy extensively adopted to boost the carrier separation e ciency is to construct composite materials featuring heterojunctions, in which the internal electric eld (IEF), resulting from the different band structures at the interface, is expected to facilitate the carrier separation and migration 18,19 .…”

Section: Main Textmentioning

confidence: 99%

Anion-Exchange-Mediated Internal Electric Field: Boosting Photogenerated Carrier Separation and Utilization

Han

Cao

et al. 2020

Preprint

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Constructing heterojunctions is a commonly used method for heterogeneous photocatalysts to modulate the internal electric field (IEF); however, this method suffers from narrow IEF distribution (primarily limited at the heterojunction interface) and long migration paths of photocarriers, and therefore results in suboptimal efficiencies in carrier separation and utilization. In this work, we report for the first time novel basic bismuth nitrate compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition; by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. A low exchange ratio (~10%) with halide anions (I–, Br–, Cl–) would give rise to a prominent elevation in carrier separation efficiency; for the reaction of photocatalytic oxidative coupling of benzylamine, the conversions over the modified catalysts are 1.6–2 times as high as that over pristine BOH. Benefiting from the unique crystal structure and the localization of valence electrons, the IEF intensity increases with the atomic number of introduced halide anions, leading to an enhanced efficiency of carrier separation and utilization. Our work here offers new insights into the design and optimization of semiconductor photocatalysts.

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Composite H3PW12O40–TiO2 catalysts for toluene selective photo-oxidation

Cited by 63 publications

References 46 publications

Novel (NH4)4[NiMo6O24H6]·5H2O – TiO2 composite system: Photo-oxidation of toluene under UV and sunlight-type illumination

Novel (NH4)4[NiMo6O24H6]·5H2O – TiO2 composite system: Photo-oxidation of toluene under UV and sunlight-type illumination

Facile mechanochemical modification of g-C3N4 for selective photo-oxidation of benzyl alcohol

Anion-Exchange-Mediated Internal Electric Field: Boosting Photogenerated Carrier Separation and Utilization

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