Spectrooptical investigation of the palladium state in Pd/TiO2 and Pd/TiO2(Nb2O5) systems

Коваленко, Н. А.; Petkevich, T. S.; Egiazarov, Yu. G.

doi:10.1007/bf02679224

Cited by 3 publications

(7 citation statements)

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“…The presence of a metal that has reductive properties such as Pd will help to reduce the hydrazo functional group further by completely cleaving the azo linkage . Kovalenko et al reported that Pd in the Pd/TiO 2 system acts as a better reducing agent. Electron-density transfer of TiO 2 to Pd makes the metal a better reducing agent .…”

Section: Resultsmentioning

confidence: 99%

“…Kovalenko et al reported that Pd in the Pd/TiO 2 system acts as a better reducing agent. Electron-density transfer of TiO 2 to Pd makes the metal a better reducing agent . In addition, 2e − photocatalytical reduction of TiO 2 further enhances the process of cleaving the azo linkage.…”

Section: Resultsmentioning

confidence: 99%

“…Electrondensity transfer of TiO 2 to Pd makes the metal a better reducing agent. 39 In addition, 2ephotocatalytical reduction of TiO 2 further enhances the process of cleaving the azo linkage.…”

Section: Resultsmentioning

confidence: 99%

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Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

et al. 2008

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Self-organized, vertically oriented TiO2 nanotube arrays prepared by the sonoelectrochemical anodization method are functionalized with palladium (Pd) nanoparticles of approximately 10 nm size. A simple incipient wetness method is adopted to distribute the Pd nanoparticles uniformly throughout the TiO2 nanotubular surface. This functionalized material is found to be an excellent heterogeneous photocatalyst that can decompose nonbiodegradable azo dyes (e.g., methyl red and methyl orange) rapidly (150-270 min) and efficiently (100%) under ambient conditions using simulated solar light in the absence of any external oxidative radicals such as hydrogen peroxide.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

et al. 2008

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“…Pd nanoparticles, with sizes ranging from 10 to 20 nm, are found mostly dispersed on the top of the NTAs. They act as catalysts to promote the photocatalytic reactions , by improving the rate of reduction of oxygen and preventing electron−hole recombination.…”

Section: Resultsmentioning

confidence: 99%

Transparent, Well-Aligned TiO₂ Nanotube Arrays with Controllable Dimensions on Glass Substrates for Photocatalytic Applications

Tan

Kumar

et al. 2010

ACS Appl. Mater. Interfaces

103

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Transparent, well-aligned TiO(2) nanotube arrays (NTAs) with controllable dimensions are grown on glass substrates via atomic layer deposition (ALD) of TiO(2) onto free-standing porous anodic alumina (PAA) templates. Photodegradation of aqueous methylene blue (MB) solution and solid stearic acid (SA) film using TiO(2) NTAs of various wall thicknesses are investigated. The Pd functionalized TiO(2) NTAs, with a wall thickness of 15 nm and height of 200 nm, has the highest photodegradation efficiency at 76% after 4 h of UV irradiation. These functionalized NTAs are able to photodegrade MB molecules completely as no obvious demethylated byproducts are observed during the process. It also demonstrates excellent photocatalytic activity for solid contaminants such as SA film. By using the ALD technique, the nanotube wall thickness can be precisely controlled so that it is sufficiently thin to be transparent while sufficiently thick for excellent photocatalytic performances. The transparent TiO(2) NTAs on glass substrates with excellent photocatalytic properties might have potential applications in self-cleaning coating, transparent electronics, and solar cells.

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“…2. According to [15,16], an increase in the fraction of the weakly bound forms of CO in catalysts for exhaustive oxidation increases their catalytic activity. Accordingly, the Ag/Pd/TiO 2 sample on the surface of which the CO is adsorbed predominantly in weakly bound forms should exhibit higher activity.…”

Section: Sample No 2 (Ag/pd/tio 2 )mentioning

confidence: 99%

Study of the state of Ag and Pd in silver-palladium catalysts on a titanium dioxide substrate by IR spectroscopy of adsorbed CO

et al. 2007

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We have used IR spectroscopy of adsorbed CO to study the effect of the method for preparation of silver-palladium catalysts on a TiO 2 substrate and exposure to an oxidizing or reducing gaseous atmosphere on the state of Ag and Pd centers. We have shown that as a result of the metal-support interaction, the reducibility of the Ag and Pd particles is increased, which leads to a change in their adsorption and catalytic properties.Introduction. Supported bimetallic catalysts containing Pd and Ag have high activity and selectivity in various exhaustive and partial oxidation processes [1,2]. We know [3-6] that Ag has a considerable effect on the sorption and catalytic properties of supported palladium catalysts. Thus in [1,2] it is shown that modification of aluminum-palladium catalysts by silver leads to an increase in their activity in oxidation of carbon monoxide, methanol, and ethylene.According to [2][3][4], the change in the catalytic activity of bimetallic systems is connected with interaction of Pd and Ag on the surface of the supports, which leads to formation of new active centers involving them. Thus in the opinion of the authors of [4,5], synergism in the catalytic effect of Ag-Pd/Al 2 O 3 in oxidation of CO is due to formation of Ag-Pd alloys. In [6], in-situ IR spectroscopy of adsorbed CO was used to establish the substantial effect of Ag additives on the sorption characteristics of Pd/SiO 2 .In the spectra of CO adsorbed on the Ag-Pd/SiO 2 surface, the ratio of linear and bridge complexes of palladium with CO changes appreciably compared with unmodified samples. Analogous data were obtained in [5], suggesting an increase in the fraction of the linear forms of adsorbed CO when Ag is introduced.Interaction of Pd and Ag on the surface of the support and the composition of the surface particles are mainly determined by the conditions under which the catalysts are prepared and activated. Thus in [3], the presence of monometallic and bimetallic particles was established on the surface of a Pd-Ag/Al 2 O 3 catalyst obtained by deposition of both components from one impregnating solution. Preliminary modification of the Al 2 O 3 by palladium leads to formation of interstitial structures, while modification of the support by silver does not yield such structures.In [6], it is shown that oxidizing treatment of Ag-Pd/SiO 2 leads to segregation of the metals, while high-temperature reduction by hydrogen induces surface migration of the Ag.The aim of this work was to study the effect of the preparation conditions for silver-palladium catalysts on a titanium dioxide substrate and their treatment in oxidizing or reducing gaseous atmospheres on the formation of Ag and Pd centers, and also their activity in oxidation reactions.The experiment. Titanium dioxide, obtained by precipitation of TiO(OH) 2 by ammonia from a TiOSO 4 solution, was used as the support to prepare the catalysts [7]. Depending on the method for deposition of the metals, the following catalyst samples were obtained.Sample No. 1 (Pd/TiO 2 ). The TiO 2 s...

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Spectrooptical investigation of the palladium state in Pd/TiO2 and Pd/TiO2(Nb2O5) systems

Cited by 3 publications

References 17 publications

Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Transparent, Well-Aligned TiO₂ Nanotube Arrays with Controllable Dimensions on Glass Substrates for Photocatalytic Applications

Study of the state of Ag and Pd in silver-palladium catalysts on a titanium dioxide substrate by IR spectroscopy of adsorbed CO

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Spectrooptical investigation of the palladium state in Pd/TiO2 and Pd/TiO2(Nb2O5) systems

Cited by 3 publications

References 17 publications

Functionalization of Self-Organized TiO2 Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Functionalization of Self-Organized TiO2 Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Transparent, Well-Aligned TiO2 Nanotube Arrays with Controllable Dimensions on Glass Substrates for Photocatalytic Applications

Study of the state of Ag and Pd in silver-palladium catalysts on a titanium dioxide substrate by IR spectroscopy of adsorbed CO

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Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Functionalization of Self-Organized TiO₂ Nanotubes with Pd Nanoparticles for Photocatalytic Decomposition of Dyes under Solar Light Illumination

Transparent, Well-Aligned TiO₂ Nanotube Arrays with Controllable Dimensions on Glass Substrates for Photocatalytic Applications