ATR-IR study of the adsorption of 2′-hydroxyacetophenone and benzaldehyde on MgO

Cortes-Concepcion, Jose A.; Williams, Christopher T.; Amiridis, Michael D.

doi:10.1016/j.catcom.2011.09.033

Cited by 3 publications

(3 citation statements)

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“…The origin of the observed loss in selectivity is difficult to ascertain at this stage, but we think that it could be related to the strong adsorption of some of the reaction products on the catalyst surface. In fact, FTIR analysis of the spent catalyst, after washing it three times with the reaction solvent, showed a weak band at near 1610 cm −1 which could be assigned to the presence of benzaldehyde surface species [ 53 ] that could be affecting to some extent the selectivity of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

Rossi-Fernández¹,

Radivoy²

2021

Beilstein J. Org. Chem.

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A new heterogeneous catalytic system consisting of cobalt nanoparticles (CoNPs) supported on MgO and tert-butyl hydroperoxide (TBHP) as oxidant is presented. This CoNPs@MgO/t-BuOOH catalytic combination allowed the epoxidation of a variety of olefins with good to excellent yield and high selectivity. The catalyst preparation is simple and straightforward from commercially available starting materials and it could be recovered and reused maintaining its unaltered high activity.

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Section: Resultsmentioning

confidence: 99%

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

Rossi-Fernández¹,

Radivoy²

2021

Beilstein J. Org. Chem.

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“…Through the end of the last century, there was no information regarding the surface of chiral-modified metals under conditions approaching those of the actual reaction conditions (i.e., liquid phase, elevated H 2 pressures). The application of in situ vibrational spectroscopic techniques such as infrared reflection–absorption spectroscopy (IRAS) , and attenuated total reflection infrared (ATR-IR) spectroscopy − has made it possible to begin to address this situation over the past decade and moving forward.…”

Section: Introductionmentioning

confidence: 99%

An In Situ Spectroscopic Study of Prochiral Reactant–Chiral Modifier Interactions on Palladium Catalyst: Case of Alkenoic Acid and Cinchonidine in Various Solvents

Tan

Williams

2013

J. Phys. Chem. C

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In situ attenuated total reflection infrared (ATR-IR) spectroscopy has been used to study the adsorption of a model α,β-unsaturated carboxylic acid (2-methyl-2-pentenoic acid) and chiral modifier (cinchonidine), as well as their intermolecular interactions, on Pd/Al2O3 in typical polar (methanol) and nonpolar (dichloromethane) solvents. It has been found that the solvent has essentially no effect on cinchonidine adsorption. The carboxylic acid tends to adsorb on surface through bridging bidentate carboxylate in MeOH instead of monomer or dimer species, which is prevalent in the case of CH2Cl2. Moreover, an acid–cinchonidine complex prefers to form in a substrate to modifier ratio of 1:1, regardless of whether it is in the bulk solution or adsorbed on the surface. Thus, direct spectroscopic observation of an important intermediate in this catalytic system has been made.

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“…ATR-IR spectroscopy is a well-known method and has been used in the past to study solid–liquid and solid–gas interfaces. ATR-IR spectroscopy was also applied in catalysis and photocatalysis research to investigate TiO 2 and other materials. − Besides the investigation of adsorption, ATR-IR in combination with a flow-through cell was also used to study diffusion processes. , The method was also used in the past in organic photovoltaic research to gain further insights into dye adsorption or polymer concentration …”

Section: Introductionmentioning

confidence: 99%

Dye Bonding to TiO₂: In Situ Attenuated Total Reflection Infrared Spectroscopy Study, Simulations, and Correlation with Dye-Sensitized Solar Cell Characteristics

et al. 2012

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Processing dye-sensitized solar cells gains more and more importance as interest in industrial applications grows daily. For large-scale processing and optimizing manufacturing in terms of environmental acceptability as well as time and material saving, a detailed knowledge of certain process steps is crucial. In this paper we concentrate on the sensitizing step of production, i.e., the anchoring of the dye molecules onto the TiO(2) semiconductor. A vacuum-tight attentuated total reflection infrared (ATR-IR) flow-through cell was developed, thus allowing measurements using a vacuum spectrometer to monitor infiltration of dye molecules into the porous TiO(2) film in situ at high sensitivity. In particular, the influence of the anchor and backbone of perylene dye molecules as well as the influence of solvents on the adsorption process was investigated. The experiments clearly show that an anhydride group reacts much slower than an acid group. A significantly lower amount of anhydride dye can be adsorbed on the films. Ex situ transmission experiments furthermore indicate that the availability of OH groups on the TiO(2) surface may limit dye adsorption. Also the backbone and base frame of the dye can influence the adsorption time drastically. Electrical cell characteristics correlate with the amount of adsorbed dye molecules determined by in situ ATR-IR measurements. The latter is also sensitive toward the diffusion of the dye through the porous layer. To gain a deeper understanding of the interplay between diffusion and adsorption, simulations were performed that allowed us to extract diffusion and adsorption constants. Again it was demonstrated that the anchoring group has a strong effect on the adsorption rate. The influence of the solvent was also studied, and it was found that both adsorption and desorption are affected by the solvent. Protic polar solvents are able to remove bound dye molecules, which is a possible pathway of cell degradation. Most importantly, the analysis shows the potential of this approach for the evaluation of molecules or additives concerning their characteristics important for cell processing.

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ATR-IR study of the adsorption of 2′-hydroxyacetophenone and benzaldehyde on MgO

Cited by 3 publications

References 31 publications

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

An In Situ Spectroscopic Study of Prochiral Reactant–Chiral Modifier Interactions on Palladium Catalyst: Case of Alkenoic Acid and Cinchonidine in Various Solvents

Dye Bonding to TiO₂: In Situ Attenuated Total Reflection Infrared Spectroscopy Study, Simulations, and Correlation with Dye-Sensitized Solar Cell Characteristics

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ATR-IR study of the adsorption of 2′-hydroxyacetophenone and benzaldehyde on MgO

Cited by 3 publications

References 31 publications

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

An In Situ Spectroscopic Study of Prochiral Reactant–Chiral Modifier Interactions on Palladium Catalyst: Case of Alkenoic Acid and Cinchonidine in Various Solvents

Dye Bonding to TiO2: In Situ Attenuated Total Reflection Infrared Spectroscopy Study, Simulations, and Correlation with Dye-Sensitized Solar Cell Characteristics

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Dye Bonding to TiO₂: In Situ Attenuated Total Reflection Infrared Spectroscopy Study, Simulations, and Correlation with Dye-Sensitized Solar Cell Characteristics