Selective photocatalytic oxidation of aromatic alcohols in solar-irradiated aqueous suspensions of Pt, Au, Pd and Ag loaded TiO 2 catalysts

Yurdakal, Sedat; Tek, Bilge Sina; Değirmenci, Çağlar; Palmisano, Giovanni

doi:10.1016/j.cattod.2016.05.054

Cited by 51 publications

(21 citation statements)

References 27 publications

(42 reference statements)

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“…For example, the selective photocatalytic oxidation of 4-methoxybenzyl alcohol and 4-nitrobenzyl alcohol were achieved to form the related acids. [49] Recently, through good control of the selective oxidation of 3-pyridinemethanol, the corresponding aldehyde and vitamin B 3 can be obtained with the Pt/TiO 2 catalyst under UV light irradiation at pH 12 with the oxygen in air acting as the oxidant. The vitamin B 3 selectivity is as high as 75% for 50% conversion.…”

Section: Uv Light-driven Photocatalysismentioning

confidence: 99%

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

239

116

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photocatalysis based on semiconductors represents another route for light energy conversion. This route endows the direct conversion of light energy into oxidation and reduction energy via charge carriers (electrons and holes) generated in the semiconductors. For instance, the photocatalytic degradation of harmful and toxic organic substances, dyes, and chemicals has been considered to be a suitable candidate for removing organic pollution from water, [5][6][7][8] where photooxidation dominates the degradation of the organic molecules. The full process of photocatalytic water splitting into H 2 and O 2 is believed to be promising for generating renewable and green energy, [9,10] and the process includes the photoreduction and photooxidation of water, respectively. The photocatalytic reduction of CO 2 can convert solar energy into chemical energy, stored as CH 4 , CO, CH 3 OH, etc. [11][12][13] These processes can help reduce the pressure of the global warming crisis and supply usable renewable energy. Due to the precise control of photocatalytic reduction and oxidation, photocatalytic molecular synthesis has also attracted much interest, which provides a sustainable pathway for green synthesis. [14][15][16] For an efficient photocatalytic process, solar light harvesting and a redox process based on photogenerated charge carriers are essential steps. Solar light harvesting consists of light absorption and charge carrier excitation steps, which can be expressed as the light utilization efficiency. The efficiency determines the total energy converted from solar light and is mostly determined by the band structure of the semiconductor applied to the photocatalytic process.The photocatalytic process has been extensively studied by examining the response of photocatalysts to UV light, due to its relatively high photonic energy. As is well known, UV light energy amounts to no more than 5% of the solar light energy. Visible light and near-infrared (NIR) light contain approximately 90% of the solar light energy. To utilize solar light in order to solve the environmental and energy crisis, visible light and NIR-light-activated photocatalysts are essential. For decades, many studies have focused on expanding the range over which a photocatalyst can utilize the solar light spectrum. In addition, there are several good reviews summarizing recent progress on UV-vis-light-activated photocatalysts, as well as strategies to improve the photocatalytic efficiency. [17][18][19][20] As is well known, the photonic energy of visible light is low, and that of NIR light is even lower. Photoinduced redox requires an initial amount of energy to activate the process; however, NIR photonic energy may be too low to realize photoinduced The realization of light-chemical energy conversion using solar light is an ideal goal in renewable energy studies. Many reports are concerned with extracting energy from solar light and the use/storage of the converted energy. Due to the progress in solar light absorption with various photocatalysts, the vari...

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Section: Uv Light-driven Photocatalysismentioning

confidence: 99%

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

239

116

View full text Add to dashboard Cite

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“…Selective photooxidation of alcohols has received special attention from research groups in the recent years due to economical feasibility (no heating is applied) and ecofriendliness. A variety of studies dedicated to partial oxidation of aromatic alcohols features titania-based systems with such modifiers (or combination thereof) as CdS [157], ZnO [158], WO 3 [159], CeO 2 [160], Fe 3+ [161], vanadyl species [162], Ag [163], AgBr [164,165], Au [166], Pt, Rh or Ir [167]. A selection of recent works on the subject also mention gold catalysts on different supports such as hydrotalcite [168], niobium oxide perovskites [169], zeolites [170] or CeO 2 [171].…”

Section: Selective Photooxidation Of Alcoholsmentioning

confidence: 99%

“…al. [163], with titania-based catalysts employed. The experiment was carried out with pH values of 1, 7 and 13.…”

Section: Selective Photooxidation Of Alcoholsmentioning

confidence: 99%

Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

et al. 2018

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Alcohols (bioalcohols) is a class of chemicals that are used as a feedstock for the manufacturing of a large number of valuable intermediates in industrially important processes. Currently, sustainable technologies for selective conversion of alcohols utilize “green” oxidants, mainly, ambient air or oxygen. Due to the high affinity of oxygen towards silver, the latter serves as an active component of supported heterogeneous catalysts. In this review, we consider Ag-based catalysts that participate in gas- or liquid-phase oxidation of alcohols. Oxidation of methanol, ethanol, ethylene glycol, propylene glycol, glycerol, benzyl and allyl alcohols is mostly considered. A particular attention is paid to selective photooxidation of alcohols over Ag-based catalysts. We discuss the catalyst composition in terms of (1) the state of the active component, (2) the nature of the substrate, (3) support nature, and (4) the strength of the metal–support interactions.

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“…PMH photocatalysts are also explored for photochemical reactions, such as organic transformations, having a low toxicity and being environmental [129,130]. At present, the involved organic transformations mediated by PMH photocatalysts can be summarized into mainly three aspects [131][132][133]: (1) the oxidation of alcohol, amine, alkene and alkane or hydroxylation reactions of aromatic compounds, (2) the activation and functionalization of α-C-H bonds to build up C-C bonds or C-X (X = O, N or S) bonds and (3) the reduction of nitrobenzene to aminobenzene or azobenzene. Compared to conventional routes, PMH photocatalysts can bring milder reaction conditions that are derived from light in contrast to heat-induced chemical reactions; most reactions can be achieved under room temperature or even lower.…”

Section: Photochemical Reactionsmentioning

confidence: 99%

Progress in the Utilization Efficiency Improvement of Hot Carriers in Plasmon-Mediated Heterostructure Photocatalysis

et al. 2019

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The effect of plasmon-induced hot carriers (HCs) enables the possibility of applying semiconductors with wide band gaps to visible light catalysis, which becomes an emerging research field in environmental protections. Continued efforts have been made for an efficient heterostructure photocatalytic process with controllable behaviors of HCs. Recently, it has been discovered that the improvement of the utilization of HCs by band engineering is a promising strategy for an enhanced catalytic process, and relevant works have emerged for such a purpose. In this review, we give an overview of the recent progress relating to optimized methods for designing efficient photocatalysts by considering the intrinsic essence of HCs. First, the basic mechanism of the heterostructure photocatalytic process is discussed, including the formation of the Schokkty barrier and the process of photocatalysis. Then, the latest studies for improving the utilization efficiency of HCs in two aspects, the generation and extraction of HCs, are introduced. Based on this, the applications of such heterostructure photocatalysts, such as water/air treatments and organic transformations, are briefly illustrated. Finally, we conclude by discussing the remaining bottlenecks and future directions in this field.

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Selective photocatalytic oxidation of aromatic alcohols in solar-irradiated aqueous suspensions of Pt, Au, Pd and Ag loaded TiO 2 catalysts

Cited by 51 publications

References 27 publications

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

Progress in the Utilization Efficiency Improvement of Hot Carriers in Plasmon-Mediated Heterostructure Photocatalysis

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