TiO2/Cu(II) photocatalytic production of benzaldehyde from benzyl alcohol in solar pilot plant reactor

Spasiano, Danilo; Rodriguez, Lucia del Pilar Prieto; Carbajo, Jaime; Malato, Sixto; Marotta, Raffaele; Andreozzi, Roberto

doi:10.1016/j.apcatb.2013.01.055

Cited by 71 publications

(30 citation statements)

References 37 publications

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“…Although the investigation of selective photocatalytic conversion of aromatic alcohols and HMF has advanced significantly in the last two decades, still the research in this field is mainly limited to laboratory studies and only few reports on scaling-up of this process using TiO2 photocatalyst exist [26]. Here, we will demonstrate the applicability of the PCN and PCN-H2O2 adduct photocatalysts for pilot plant scale partial photocatalytic oxidation of HMF to FDC under natural sunlight.…”

Section: -mentioning

confidence: 91%

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

et al. 2018

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This work reports a study on the reactivity of pristine and H2O2 treated carbon nitride samples for sunlight photocatalytic selective reactions. The characterization of these materials was reported in a previous paper where the reactivity versus the partial oxidation of 5hydroxymethylfurfural (HMF) was studied by using two different laboratory scale photoreactors; one irradiated by UV lamps and the other one by natural sunlight. In the present study it has been confirmed the effectiveness of these C3N4 based materials for the selective partial oxidation of HMF to FDC (2,5-furandicarboxaldehyde) in aqueous medium in a pilot plant photoreactor irradiated by natural solar light. The reactivity results and, in particular, the selectivity to FDC formation have been very encouraging, mostly by considering that the reaction was carried out in water. Moreover, they are comparable with those obtained in the laboratory scale photoreactor irradiated by both UV artificial lamps and natural sunlight. Interestingly, the pristine C3N4 sample has shown a higher HMF conversion with respect to that of the C3N4-H2O2 adduct, but the last one is more selective to the FDC formation. A kinetic study indicates that, the pseudo-2 first-order rate constant for HMF oxidation is higher in the case of bare photocatalyst and that the equilibrium adsorption constants of HMF are higher in the case of C3N4-H2O2 adduct catalyst. Finally, the partial oxidation of two aromatic alcohols, i.e. benzyl alcohol (BA) and 4-methoxy benzyl alcohol (4-MBA) to benzaldehyde (BAL) and 4-methoxy benzaldehyde (4-MBAL), respectively, has also been studied. It has been found that the inductive and delocalization effects as well as the ortho-para orienting ability of the methoxy group with respect to the hydroxyl one affects the conversion of aromatic alcohol and the selectivity towards the corresponding aldehyde.

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Section: -mentioning

confidence: 91%

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

et al. 2018

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“…[1][2][3] Since Fujishima discovered that TiO 2 as electrodes could realize photocatalytic hydrogen production in 1972, [4] semiconductor photocatalysis has received significant attention for dealing with environmental pollution due to some of its outstanding advantages (such as low-toxicity, low-cost, mild reaction condition, environment-friendliness and so on). [5,6] The key to photocatalytic technology is developing highly efficient semiconductor photocatalysts. To date, most photocatalysts reported can be stimulated only by UV or visible light, such as TiO 2 , [7,8] TiO 2 À Bi 2 WO 6 , [9] Ta 3 N 5 À Pt, [10] Ta 3 N 5 À Bi 2 MoO 6 , [11] g-C 3 N 4 [12][13][14] and HCNÀ Au, [15] etc.…”

Section: Introductionmentioning

confidence: 99%

Vis‐NIR Light‐Responsive Photocatalytic Activity of C₃N₄−Ag−Ag₂O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst

et al. 2019

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C3N4‐decorated carbon‐fiber (CF) cloth has been demonstrated to be a filter‐membrane‐shaped photocatalyst for degrading flowing wastewater, but it can be excited only by visible light (λ<450 nm). To extend the photoresponse range to NIR region, herein we have designed and prepared C3N4−Ag−Ag2O heterojunctions on CF cloth. The growth of C3N4 nanosheets (thickness: 20–30 nm) on CF cloth is realized by a thermal condensation method, and then Ag/Ag2O nanoparticles (10–20 nm) are deposited on CF/C3N4 cloth by a chemical precipitation method. CF/C3N4/Ag/Ag2O cloth exhibits excellent flexibility and strong photoabsorption in a broad Vis‐NIR region (400–1400 nm), wider than CF/C3N4 (absorption edge: 450 nm). Under the irradiation of 808 nm or 980 nm laser, CF/C3N4/Ag/Ag2O cloth can remove 83 %/41 % AO7 and 72 %/38 % 4‐CP in 140 min respectively, significantly higher than those (33 %/13 % AO7 and 31 %/10 % 4‐CP) by CF/Ag/Ag2O cloth and those (3 %/1 % AO7 and 0 %/1 % 4‐CP) by CF/C3N4 cloth. Interestingly, when CF/C3N4/Ag/Ag2O cloth is used as the filter‐membrane to photo‐degrade the flowing wastewater (AO7, 20 mg L−1, rate: 1.5 L h−1), the removal efficiency of AO7 reaches up 97 % after 8 grade reactors. Therefore, CF/C3N4/Ag/Ag2O cloth can be used as an efficient filter‐membrane‐shaped photocatalyst with NIR photoresponse.

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“…Photobiorefinery possesses strong potential to compensate or even replace some conventional processes and pilot‐plant scale of several photobiorefinery processes have been demonstrated. For instance, a production of benzaldehyde, an important substrate for high‐value aromatics, has been realized by titania‐based photocatalytic oxidation of benzyl alcohol in aqueous solution under natural sunlight . The pilot‐scale reaction was performed in a compound parabolic collectors (CPC) reactor at a working temperature of approximately 38 °C, yielding benzaldehyde ∼50 % with ∼60 % selectivity.…”

Section: Photobiorefinery As the New Hopementioning

confidence: 99%

Beyond Artificial Photosynthesis: Prospects on Photobiorefinery

et al. 2020

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Artificial photosynthesis (AP) technology which integrates solar energy harvesting and chemical conversion process into one device is a promising solution to both global energy and environmental crises. Despite decades of research, AP for solar hydrogen production and CO2 reduction remains in the technological infancy. The low profit margins of the targeted products, the highly energy‐intensive process, and the engineering impracticality have kept AP technology in the laboratory demonstration stage. Photobiorefinery, a photocatalytic process for biomass valorization, has emerged as a new promising application for AP technology. This process offers high‐value products, requires less energy, and potentially could utilize AP process to enhance selectivity. In this Minireview, the recent progress in photocatalytic biomass depolymerization, partial oxidation, hydrogenolysis, and hydrogenation are featured. Challenges and prospects of the photocatalytic biomass valorization towards commercialization are also discussed.

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TiO2/Cu(II) photocatalytic production of benzaldehyde from benzyl alcohol in solar pilot plant reactor

Cited by 71 publications

References 37 publications

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Vis‐NIR Light‐Responsive Photocatalytic Activity of C₃N₄−Ag−Ag₂O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst

Beyond Artificial Photosynthesis: Prospects on Photobiorefinery

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TiO2/Cu(II) photocatalytic production of benzaldehyde from benzyl alcohol in solar pilot plant reactor

Cited by 71 publications

References 37 publications

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Vis‐NIR Light‐Responsive Photocatalytic Activity of C3N4−Ag−Ag2O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst

Beyond Artificial Photosynthesis: Prospects on Photobiorefinery

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Vis‐NIR Light‐Responsive Photocatalytic Activity of C₃N₄−Ag−Ag₂O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst