Photo-oxidation of alkanes by metal oxide semiconductors

Giannotti, C.; Greneur, Soizic Le; Watts, Oliver

doi:10.1016/s0040-4039(00)94043-7

Cited by 44 publications

(49 citation statements)

References 8 publications

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“…4,5 In particular, high cyclohexanone selectivities were reported in the selective oxidation of cyclohexane. [6][7][8][9][10][11] Du et al 12 observed that the choice of reactor is important to achieve a high ketone over alcohol selectivity. Pyrex is a necessity, since it prevents highly energetic radiation from entering the reactor, and thus the formation of excess cyclohexanol.…”

Section: Introductionmentioning

confidence: 99%

“…Pyrex is a necessity, since it prevents highly energetic radiation from entering the reactor, and thus the formation of excess cyclohexanol. Several other aspects of optimizing the photocatalytic process have been taken into consideration, such as reactor design, 13,14 catalyst modifications, 8,15,16 and solvent used. 6,7,17 More recently, by the use of operando techniques 18 novel insight into the mechanism of this reaction and reasons for catalyst deactivation were reported.…”

Section: Introductionmentioning

confidence: 99%

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Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

Carneiro

Almeida

Moulijn

et al. 2010

Phys. Chem. Chem. Phys.

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A systematic study is presented on the effect of crystallite size of Anatase (Hombikat, Sachtleben), varied by calcination at different temperatures up to 800 degrees C, on photocatalytic activity in cyclohexane selective oxidation. Two different reactors were used to test the materials: a top illumination reactor and an in situ ATR-FTIR cell. Properties such as crystallinity and associated availability of holes and electrons for surface reactions, as well as the amount of surface OH-groups, are shown to have a significant influence on TiO(2) activity, (surface) selectivity, and stability. Upon increasing the crystallite size, productivity (g(-1)(catalyst)) decreases, while (i) the TOF (moles of cyclohexanone formed per minute per OH-site), (ii) the rate of cyclohexanone desorption, (iii) catalytic site stability, and (iv) the cyclohexanol/cyclohexanone ratio increase. The results are discussed on the basis of a reaction scheme, and a simple reaction rate equation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

Carneiro

Almeida

Moulijn

et al. 2010

Phys. Chem. Chem. Phys.

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“…The current commercial process is very energetically intensive, and several studies have focused on the direct use of photon energy to selectively oxidize cyclohexane at room temperature using a photocatalyst [1][2][3][4][5][6][7][8][9][10][11]. Although a high ketone over alcohol selectivity is obtained in photocatalytic cyclohexane oxidation, a low conversion (quantum efficiency) and rapid catalyst deactivation prevent application in practice.…”

Section: Introductionmentioning

confidence: 99%

How Gold Deposition Affects Anatase Performance in the Photo-catalytic Oxidation of Cyclohexane

et al. 2009

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Gold deposition on Hombikat UV100 was found to negatively affect the activity of this Anatase catalyst in selective photo-oxidation of cyclohexane. By ammonia TPD and DRIFT spectroscopy it was determined that the Au deposition procedure leads to a significant decrease in OH-group density (mol m -2 BET ) on Hombikat, suggesting that the amount of surface OH-groups, rather than the presence or absence of Au, is determining the catalytic performance. The importance of surface OH-groups was demonstrated by comparing the performance of Hombikat (with and without Au deposition) to surface propoxylated TiO 2 , synthesized by a sol-gel method from titanium (IV) isopropoxide. The effect of the deposition recipe of noble metals on the surface composition of TiO 2 should thus be taken into account in evaluating and explaining photocatalytic performance of TiO 2 modified by noble metals (Au), in particular in non-aqueous phase reactions.

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“…Photocatalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone is an important commercial reaction, used as precursors in the synthesis of adipic acid and caprolactam, in turn used in the manufacture of nylon 66 and nylon 6, respectively. The selective oxidation of cyclohexane to cyclohexanol and cyclohexanone both under liquid and gaseous phase at room temperature and pressure by photocatalytic process was studied [10,[19][20][21]. The product selectivity depends on the nature of the catalyst, irradiation wavelength and presence of solvent and O 2 , etc.…”

Section: Oxidation Of Hydrocarbonmentioning

confidence: 99%

“…Different semiconductors (e.g., TiO 2 , ZnO, α-Fe 2 O 3 and WO 3 ) are considered for their potential use as photocatalysts. In early 1980s, great effort was placed on organic synthesis by semicon-ductor photocatalysis [10]. Photocatalysis in synthetic route has attracted many researchers, because this method presents a greener approach to organic synthesis [11,12].…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Semiconductor Photocatalysis for Organic Fine Chemical Synthesis

Khayyat¹,

Selvin²,

Roselin³

2016

Applied Photosynthesis - New Progress

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Photocatalytic process is a well-known reaction in photosynthesis by plants and algae. "rtificial photosynthesis is a chemical process that mimics the natural plant photosynthesis to make important chemicals by using man-made materials. One of the most promising methods of artificial photosynthesis is synthesis of organic chemicals, including biodegradable plastics, pharmaceutical drugs, liquid fuels and intermediates for valuable chemicals, etc. In , Fujishima and Honda discovered photocatalytic process using TiO semiconductor oxide electrodes to generate hydrogen from water. Researchers have achieved a single-step system that uses semiconductor particles for organic fine chemical synthesis under UV or visible radiation. This chapter summarizes the recent research trends on artificial photosynthesis by photocatalytic process for organic fine chemical synthesis on selected photocatalytic organic transformations, especially photocatalytic transformations by oxidation, carbon-carbon and carbon-heteroatom coupling, cyclization, etc.

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Photo-oxidation of alkanes by metal oxide semiconductors

Cited by 44 publications

References 8 publications

Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

Cyclohexane selective photocatalytic oxidation by anatase TiO2: influence of particle size and crystallinity

How Gold Deposition Affects Anatase Performance in the Photo-catalytic Oxidation of Cyclohexane

Recent Progress in Semiconductor Photocatalysis for Organic Fine Chemical Synthesis

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