Dehydrogenation of benzyl alcohol on ZSM-5 zeolites

Bezouhanova, C.; Kalvachev, Yuri; Nenova, V.; Lechert, H.

doi:10.1016/0304-5102(91)80088-k

Cited by 11 publications

(9 citation statements)

References 6 publications

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“…Function of zeolite supports—adsorption of benzyl alcohol : The adsorption of benzyl‐type alcohols on the surface of zeolites (zeolite Y, and ZSM‐5) has demonstrated that the interaction between hydroxyl groups of benzyl alcohol and zeolites (Si‐O‐Al, SiO − , or Na + ) are basically through hydrogen bonds and acid–base reactions 17. In the present study, the Au/Y catalyst with the best performance in oxidizing benzyl alcohol was selected as a model catalyst to determine the adsorption of benzyl alcohol on the Au/zeolite catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…Benzyl alcohol molecules are adsorbed on the surface of zeolite supports by hydrogen bonds 17. 27 Upon visible‐light irradiation, Au‐NPs are electronically polarised due to the SPR effect, thus leading to a relatively high electronegativity.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption of benzyl-type alcohols on the surface of zeolites (zeolite Y, and ZSM-5) has demonstrated that the interaction between hydroxyl groups of benzyl alcohol and zeolites (Si-O-Al, SiO À , or Na + ) are basically through hydrogen bonds and acid-base reactions. [17] In the present study, the Au/Y catalyst with the best performance in oxidizing benzyl alcohol was selected as a model catalyst to determine the adsorption of benzyl alcohol on the Au/zeolite catalyst. The samples for IR and Raman were prepared by mixing benzyl alcohol (1 mL) and the zeolite Y (100 mg) or the Au/Y catalyst (100 mg) together for 4 h in the dark at room temperature, followed by drying the specimens at 80 8C for 24 h. The samples were held in glass evaporating dishes and no washing was performed after adsorbing benzyl alcohol.…”

Section: Catalystmentioning

confidence: 99%

“…Benzyl alcohol molecules are adsorbed on the surface of zeolite supports by hydrogen bonds. [17,27] Upon visible-light irradiation, Au-NPs are electronically polarised due to the SPR effect, thus leading to a relatively high electronegativity. Then the a-H atoms can be abstracted from the cleavage of CÀH bond on the methylene group (-CH 2 -) of benzyl alcohol to form AuÀH bonds.…”

Section: Role Of O 2 In Photooxidation Of Benzyl Alcoholmentioning

confidence: 99%

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Zeolite‐Supported Gold Nanoparticles for Selective Photooxidation of Aromatic Alcohols under Visible‐Light Irradiation

Zhang¹,

Ke²,

Zhu³

2012

Chemistry A European J

110

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With new photocatalysts of gold nanoparticles supported on zeolite supports (Au/zeolite), oxidation of benzyl alcohol and its derivatives into the corresponding aldehydes can proceed well with a high selectivity (99 %) under visible-light irradiation at ambient temperature. Au/zeolite photocatalysts were characterised by UV/Vis, X-ray photoelectron spectroscopy (XPS), TEM, XRD, energy-dispersive spectroscopy (EDS), Brauner-Emmet-Teller (BET) analyses, IR and Raman techniques. The surface plasmon resonance (SPR) effect of gold nanoparticles, the adsorption capability of zeolite supports and the molecular polarities of aromatic alcohols were demonstrated to have an essential correlation with the photocatalytic performances. In addition, the effects of light intensity, wavelength range and the role of molecular oxygen were investigated in detail. The kinetic study indicated that the visible-light irradiation required much less apparent activation energy for photooxidation compared with thermal reaction. Based on the characterisation data and the photocatalytic performances, we proposed a possible photooxidation mechanism.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Catalystmentioning

confidence: 99%

Section: Role Of O 2 In Photooxidation Of Benzyl Alcoholmentioning

confidence: 99%

See 2 more Smart Citations

Zeolite‐Supported Gold Nanoparticles for Selective Photooxidation of Aromatic Alcohols under Visible‐Light Irradiation

Zhang¹,

Ke²,

Zhu³

2012

Chemistry A European J

110

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“…Nevertheless, photocatalytic selective oxidation can be achieved under ambient temperatures and lower oxygen pressures. 80 Under visible light irradiation, the hydrogen abstraction from the α-C atom is facilitated by the excitation of NP electrons to the benzyl alcohol molecules adsorbed 78,84,85 and it is the primary step of the pathway for selective oxidation of aromatic alcohols to the 16 corresponding aldehydes or ketones. 86,87 The reaction was conducted at ambient temperature on the Au/Y catalyst under argon atmosphere with 24.6% conversion of benzyl alcohol to benzaldehyde observed in twenty hours under visible light irradiation, while slight conversion was detected in the dark under the same conditions.…”

Section: Methodsmentioning

confidence: 99%

Pd and Pd Based Alloy Nanoparticles as Visible Light Photocatalysts for Coupling Reactions under Ambient Conditions

Peiris¹

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Photocatalysis is a rapidly emerging research field, with great potential for a wide range of applications, since it can utilize solar energy. Solar light has received much attention as it is the most abundant and cleanest renewable energy source, which produces no pollution. Therefore, synthesis of fine chemicals with solar light at ambient temperature is of the utmost interest. Nonetheless, it is still a challenge to devise new catalysts, which exhibit high activity under the full solar spectrum and moderate conditions. This project aimed to develop novel metal nanoparticle photocatalysts for several important organic reactions under visible light irradiation.The prospect of visible light irradiation driving chemical synthesis may extend the scope of organic synthesis via a more controlled, simplified, and greener process.Firstly, we focused on a systematic study of palladium nanoparticle-catalysed cross-coupling and homo-coupling reactions under visible light irradiation. These metal nanoparticles strongly absorb the light primarily through interband electronic transitions. The excited electrons interact with the reactant molecules adsorbed on the metal particle surface to accelerate coupling reactions. Therefore, the rate of the catalysed reaction depends on the concentration and energy of the excited electrons, which can be increased by increasing the light intensity. Nevertheless, mild reaction conditions, such as ambient temperatures and pressures in the reaction systems make it more environmentally benign.Secondly, we incorporated palladium metal component with silver nanoparticles to obtain silver-palladium alloy nanoparticles (Ag-Pd alloy NPs): which can catalyse the reductive coupling of nitroarenes reactions by light irradiation at ambient conditions. This provided a general indication for the possibility of the design of an alloy nanoparticle photocatalysts using silver with other transition metals, such as nickel, cobalt. This photocatalytic process is a more efficient and greener approach than thermal reactions for the reductive coupling of nitroarenes, and this improving the product yield by avoiding over-reduced products. The alloy nanoparticles strongly absorb light, energizing the conduction electrons of silver, which migrate to palladium sites at the alloy nanoparticle surface because of charge redistribution between the two metals. The alloying affects the charge redistribution iv between silver and palladium, which enhances interaction between reactant molecules and the nanoparticles. The reduction activity is sensitive to the intensity of the irradiation, the wavelength of the incident light, metal molar ratio and atmosphere of the reaction. When the molar ratio of silver and palladium in alloy nanoparticles is nearly equal, the catalysts exhibited the best performance.Finally, supported gold-palladium alloy nanoparticles (Au-Pd alloy NPs) on zirconium dioxide (ZrO 2 ) can act as efficient visible light photocatalysts for reductive N-alkylation of nitrobenzene with benzyl alcohol. ...

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Selective dehydrogenation of ethanol to acetaldehyde over Na ZSM-5 calcined at high temperature

Cai

Song

1993

React Kinet Catal Lett

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Dehydrogenation of benzyl alcohol on ZSM-5 zeolites

Cited by 11 publications

References 6 publications

Zeolite‐Supported Gold Nanoparticles for Selective Photooxidation of Aromatic Alcohols under Visible‐Light Irradiation

Zeolite‐Supported Gold Nanoparticles for Selective Photooxidation of Aromatic Alcohols under Visible‐Light Irradiation

Pd and Pd Based Alloy Nanoparticles as Visible Light Photocatalysts for Coupling Reactions under Ambient Conditions

Selective dehydrogenation of ethanol to acetaldehyde over Na ZSM-5 calcined at high temperature

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