Surface processes in selective photocatalytic oxidation of hydroxybenzyl alcohols by TiO2 P25

Bellardita, Marianna; Escolano-Casado, Guillermo; Palmisano, Leonardo; Mino, Lorenzo

doi:10.1016/j.cattod.2022.12.014

Cited by 3 publications

(2 citation statements)

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“…The preferable adsorption of these polyhydroxy species were further confirmed by FTIR spectra. As shown in Figure 6C,D, peaks locate between 3000–3500 and ≈1650 cm −1 corresponding to the hydroxyl and carbonyl group, respectively, [ 42 ] redshift after adsorption on catalyst due to a reduction of the electrodonation from the substituent groups upon surface adsorption, [ 43 ] indicating that a part of molecule is coordinated on Lewis acid sites through one of the oxygen lone pairs. [ 44 ] The enhanced adsorption of these polyhydroxy species is beneficial for their oxidation by the holes generated on TiO 2, which accounts for the observed high‐efficient photocatalytic activity of h‐ZnSe/Pt@TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

You,

Chen,

Zhao

et al. 2023

Advanced Materials

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Photocatalytic cellulose reforming usually requires harsh conditions due to its sluggish kinetics. Here, we design and fabricate a hollow structural S‐scheme heterojunction of ZnSe and oxygen vacancy enriched TiO2, namely h‐ZnSe/Pt@TiO2, with which the photocatalytic reforming of cellulose for H2 and formic acid is realized in pure water. H2 and formic acid productivity of 1858 and 372 μmol/gh and a steady H2 evolution for 300 hours were achieved with α‐cellulose. Comparable photocatalytic activity can also be achieved using various cellulose sources. It is experimentally proven that the photogenerated charge transfer follows an S‐scheme mechanism, which not only promotes the charge separation but also preserves the higher reductive and oxidative abilities of the ZnSe and TiO2, respectively. Furthermore, the polyhydroxy species produced during cellulose degradation are favored to adsorb on the oxygen vacancy enriched TiO2 surface, which promotes the photocatalytic reforming process and is account to the preservation of formic acid as the major solution phase product. Additionally, sequential reactions of oxidation of aldehydes and elimination of formic acid of the cellulose degradation process were revealed. This work provides a photocatalytic strategy to sustainably produce hydrogen and value‐added chemicals from biomass under the most environmentally benign condition, i.e., pure water.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

You,

Chen,

Zhao

et al. 2023

Advanced Materials

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“…Bases were reported to act as initiators or promoters to enhance the de-protonation of alcohol molecules by initializing activation of C-H and O-H on alcohols, thus reducing energy barriers to form intermediates or products [58,59]. The reaction solution with catalysts was stirred for 2 h at room temperature to rule out the adsorption effect, and the change in benzyl alcohol content was quantified by GC [60]. The results showed that the change in the concentration of benzyl alcohol could not be quantifiable, excluding the adsorption of benzyl alcohol on the catalysts and its contribution to conversions.…”

Section: Catalytic Testsmentioning

confidence: 99%

Selectivity Regulation of Au/Titanate by Biochar Modification for Selective Oxidation of Benzyl Alcohol

et al. 2023

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In organic synthesis, it is important to control the selectivity target product with high purity and reduce the cost of energy and equipment for separation. This study investigated supported gold catalysts on biochar-modified titanate-based nanofibers in order to regulate the catalytic performances by biochar content and surface properties. The catalysts were characterized by SEM, TEM, XRD, XPS, ICP-OES, UV-Vis to confirm their morphology, particle size distribution of Au NPs, crystal structures, oxidation state of Au and other key elements, real Au loading, and optical properties. In the test of selective oxidation of benzyl alcohol to benzaldehyde, the biochar modification could improve the selectivity toward benzaldehyde. Moreover, the influence of catalyst calcination conditions, reaction time, reaction atmospheres, reaction temperatures and solvent were systematically investigated. These results are useful for peer researchers in rational catalyst design.

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Efficient Photocatalytic Partial Oxidation of Aromatic Alcohols by Using ZnIn₂S₄ under Green Conditions.

Umair,

Pecoraro,

Di Franco

et al. 2024

ChemSusChem

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The ternary chalcogenide ZnIn2S4 (ZIS) has been synthesized by a simple hydrothermal method in which the carcinogen thiacetamide, universally used as a precursor, has been, for the first time, replaced successfully with the harmless thiourea. ZIS has been used as photocatalyst for the partial oxidation of different aromatic alcohols to their corresponding aldehyde in water solution, under ambient conditions and simulated solar light irradiation. The photocatalytic performance of ZnIn2S4 was better than TiO2 P25. In the presence of ZIS for 4‐methoxybenzyl alcohol, piperonyl alcohol, and benzyl alcohol, a selectivity towards the corresponding aldehyde of 99% for a conversion of 46%, 75% for a conversion of 81%, and 87% for a conversion of 25%, respectively, was obtained. For the same alcohols a selectivity of 19% for a conversion of 41%, 19% for a conversion of 13%, and 16% for a conversion of 26%, was observed in the presence of TiO2 P25.

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Surface processes in selective photocatalytic oxidation of hydroxybenzyl alcohols by TiO2 P25

Cited by 3 publications

References 42 publications

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

Selectivity Regulation of Au/Titanate by Biochar Modification for Selective Oxidation of Benzyl Alcohol

Efficient Photocatalytic Partial Oxidation of Aromatic Alcohols by Using ZnIn₂S₄ under Green Conditions.

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Surface processes in selective photocatalytic oxidation of hydroxybenzyl alcohols by TiO2 P25

Cited by 3 publications

References 42 publications

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H2 and Formic Acid in Pure Water

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H2 and Formic Acid in Pure Water

Selectivity Regulation of Au/Titanate by Biochar Modification for Selective Oxidation of Benzyl Alcohol

Efficient Photocatalytic Partial Oxidation of Aromatic Alcohols by Using ZnIn2S4 under Green Conditions.

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Product

Resources

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Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

Rational Design of S‐Scheme Heterojunction toward Efficient Photocatalytic Cellulose Reforming for H₂ and Formic Acid in Pure Water

Efficient Photocatalytic Partial Oxidation of Aromatic Alcohols by Using ZnIn₂S₄ under Green Conditions.