FTIR Spectroscopy of Adsorbed Probe Molecules for Analyzing the Surface Properties of Supported Pt (Pd) Catalysts

Belskaya, O. B.; Данилова, И. Г.; Казаков, М. О.; Mironenko, Roman M.; Лавренов, А. В.; Лихолобов, В. А.

doi:10.5772/36275

Cited by 32 publications

(30 citation statements)

References 73 publications

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“…This is in line with FeOOH transformation to Fe 2 O 3 that proceeds in the temperature range of 180 – 250/300 °C . Dehydroxylation of the support continues by γ ‐AlOOH transformation into Alumina , observed by the band disappearing at 3558 cm −1 , and elimination of OH groups from the γ ‐Al 2 O 3 surface, recorded by disappearance of the band at 3733 cm −1 that is characteristic of the Al 6 (OH)Al 6 form on γ ‐Al 2 O 3 ( Figure ) . This result is in agreement with partial participation of the OH groups in the reaction of CO oxidation.…”

Section: Resultssupporting

confidence: 84%

“…Anodic Alumina has a porous structure and always contains inclusions of electrolyte ions . Characteristic bands of OH groups bonded to Al atoms of different coordination on a γ ‐Al 2 O 3 surface have been registered at 3688 (Al 6 (OH)Al 4 ), 3709 (Al 6 (OH)Al 5 ), 3732 (Al 6 (OH)Al 6 ), 3743/49 (Al 6 (OH)), and 3768/3777 cm −1 (Al 5 (OH)) …”

Section: Resultsmentioning

confidence: 99%

“…Bands at 471, 590, and around 1042 cm −1 were assigned to Al–O vibration in octahedrally coordinated Al ions . Bands due to vibration of OH groups binding Al ions from different layers and/or in different coordination were positioned at 3688 cm −1 (Al 6 (OH)Al 4 ), 3709 cm −1 (Al 6 (OH)Al 5 ), 3734 cm −1 (Al 6 (OH)Al 6 ), 3768 and 3777 cm −1 (Al 5 (OH)) . The presence of aluminium hydroxide could not be excluded because of the band registered at 3624 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…[9][11] [12] Characteristic bands of OH groups bonded to Al atoms of different coordination on a c-Al 2 O 3 surface have been registered at 3688 (Al 6 (OH)Al 4 ), 3709 (Al 6 (OH)Al 5 ), 3732 (Al 6 (OH)Al 6 ), 3743/49 (Al 6 (OH)), and 3768/3777 cm À1 (Al 5 (OH)). [13] Samples of the lamella surface with deposited biogenic material were studied by diffuse-reflectance (Figure 1,c) and transmission ( Figure 2) IRS. The DRIFT spectrum displays bands positioned between 1300 and 1700 cm À1 , which were discussed above.…”

Section: Resultsmentioning

confidence: 99%

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Bioinspired Synthesis of Lepidocrocite‐Containing Material and Its Catalytic Behaviour in CO Oxidation

Shopska

Paneva

Kolev

et al. 2017

Helvetica Chimica Acta

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Leptothrix sp. was cultivated in Lieske's medium in the presence of Al foil covered by anodic Alumina. Samples of biomass deposited on lamellae were studied by the methods of infrared, Mössbauer, and X‐ray photoelectron spectroscopy. Sole deposition of γ‐FeOOH on the lamellae was found to take place. This result is explained by the influence of γ‐AlOOH ingredient in the used support due to crystal structure similarity. Thus, iron oxyhydroxide crystallisation could be directed during bacteria cultivation. The catalytic activity of deposited γ‐FeOOH was examined in CO oxidation.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Bioinspired Synthesis of Lepidocrocite‐Containing Material and Its Catalytic Behaviour in CO Oxidation

Shopska

Paneva

Kolev

et al. 2017

Helvetica Chimica Acta

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“…It can be seen that the size of individual FePt (3 nm in diameter) distributed in silica (33 nm in diameter) within a selected colloidal crystal is smaller than 5 %. FTIR is used to investigate the surface chemical group of the silica@FePt nanofilm [24]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Terahertz dielectric response of silica-encapsulated FePt core–shell colloid film

Zhou

et al. 2014

Appl. Phys. A

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Time-domain terahertz (THz) spectroscopy is employed to investigate the dielectric response of silicaencapsulated FePt core-shell colloid film in THz region. The absorption of the colloid film increases with the increasing of the frequency, while the refractive index is stable at about 1.85 in the range of 0.85-3.0 THz. The real and imaginary parts of the dielectric constant of the silica@FePt film are demonstrated to be broadband from 0.85-3.0 THz. Small dispersive features can be seen below the frequency of 0.85 THz, which is tentatively attributed to the scattering effect and the polarization relaxation under low frequency with a low dynamic range. A core-shell model combined with Maxwell-Garnett mixing rule has been used to describe the dielectric response of the colloid film, which is necessary for a reasonable explanation of the experimental data as few experiments have been done with the core-shell model employed. In the high-frequency region, the real part of the dielectric constant fits well; however, the imaginary part of the dielectric constant is lower than the experimental data. The difference between the theoretical analysis and the experimental data suggests that the interfacial effect should be paid attention for the core-shell structures as the diffusion of interfacial dipoles could influence the dielectric properties.

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Tuning the Catalytic Performance of Novel Composites Based on ZIF‐8 and Nafen through Dimensional and Concentration Effects in the Synthesis of Propylene Glycol Methyl Ether

et al. 2019

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Zeolitic imidazolate framework (ZIF‐8, Zn(2‐meIm)2) and composites based on ZIF‐8 and alumina nanofibers (NafenTM), i.e. ZIF‐8/Nafen, were demonstrated to be efficient heterogeneous catalysts for the reaction of methanol with propylene oxide to produce propylene glycol methyl ether (PGME), which is a member of the family of glycol ether solvents used for a wide variety of consumer products and industrial applications. Both the reaction rate and the selectivity toward PGME were found to decrease with increasing crystal size of the ZIF‐8 material, which was related to the change in the number of basic sites and their accessibility. The investigation of ZIF‐8/Nafen composites revealed the dependence of their catalytic performance on the amount of the ZIF‐8 component. In particular, the activity was affected by the crystal size of the ZIF‐8 material and the nature of acid‐base sites in its framework.

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FTIR Spectroscopy of Adsorbed Probe Molecules for Analyzing the Surface Properties of Supported Pt (Pd) Catalysts

Cited by 32 publications

References 73 publications

Bioinspired Synthesis of Lepidocrocite‐Containing Material and Its Catalytic Behaviour in CO Oxidation

Bioinspired Synthesis of Lepidocrocite‐Containing Material and Its Catalytic Behaviour in CO Oxidation

Terahertz dielectric response of silica-encapsulated FePt core–shell colloid film

Tuning the Catalytic Performance of Novel Composites Based on ZIF‐8 and Nafen through Dimensional and Concentration Effects in the Synthesis of Propylene Glycol Methyl Ether

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