The effect of support properties on n-octanol oxidation performed on gold – silver catalysts supported on MgO, ZnO and Nb2O5

Kaskow, Iveta; Sobczak, Izabela; Ziółek, Maria; Corberán, V. Cortés

doi:10.1016/j.mcat.2019.110674

Cited by 9 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current palladium catalysts.-The activity of palladium for electrocatalysis in several different oxidation and reduction reactions was initially found through experimentation on electrodes. 24,[34][35][36] The electrode experiments showed that both the formation of in situ carbon monoxide generated from alcohol oxidation and the subsequent poisoning effect it causes were also a problem for palladium. 34,35,37 These experiments showed that the addition of noble secondary metals, such as platinum, ruthenium, or gold, was beneficial in increasing the catalytic activity (although both metals are directly active for alcohol oxidation in the case of PtPd).…”

Section: Fuel Cellsmentioning

confidence: 99%

“…24,[34][35][36] The electrode experiments showed that both the formation of in situ carbon monoxide generated from alcohol oxidation and the subsequent poisoning effect it causes were also a problem for palladium. 34,35,37 These experiments showed that the addition of noble secondary metals, such as platinum, ruthenium, or gold, was beneficial in increasing the catalytic activity (although both metals are directly active for alcohol oxidation in the case of PtPd). The literature on secondary metals used in palladium electrocatalysis has expanded dramatically following the initial discovery.…”

Section: Fuel Cellsmentioning

confidence: 99%

See 1 more Smart Citation

Bimetallic Gold-Palladium Nanoparticles: Applications in Methanol and Ethanol Oxidation Reactions

Parkash

Islam²,

Pirzada³

et al. 2022

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

The direct methanol fuel cell (DMFC) is a fuel cell technology capable of generating energy through the electrochemical oxidation of methanol. The methanol oxidation reaction (MOR), which occurs at the anode, is of interest for producing renewable energy. This process relies on precious metal catalysts to efficiently produce energy, namely nanoscale Pt-Ru. Current fuel cell technology is, therefore, expensive, and unsuitable for large-scale implementation. Palladium can act as an electrocatalyst for the process, similar to platinum. However, its monometallic form suffers from high overpotentials and significant poisoning by carbon monoxide (CO) generated in situ. Previous research has shown improved activity of palladium in alkaline electrolytes, which, while unsuitable for platinum, are known to enhance alcohol oxidation reaction kinetics through preferred oxidation of methanol. The addition of a secondary metal assists in both modulations of palladium-reactant binding strengths and co-catalyzed oxidation of CO when exposed to the surface. This article reviews the literature on DMFC and anode electrocatalysts. The current platinum catalysts and foundation knowledge of the mechanism of platinum are compared to current palladium catalysts. The requirements for new nanoscale palladium catalysts and background on their synthesis are outlined.

show abstract

Section: Fuel Cellsmentioning

confidence: 99%

Section: Fuel Cellsmentioning

confidence: 99%

Bimetallic Gold-Palladium Nanoparticles: Applications in Methanol and Ethanol Oxidation Reactions

Parkash

Islam²,

Pirzada³

et al. 2022

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Gold-based catalysts are well-known for their high catalytic activity at low temperatures, e.g., in the oxidation of CO [93,94]. However, such catalysts were rarely investigated in NH 3 -SCO (Table 3).…”

Section: Au-and Ru-based Catalystsmentioning

confidence: 99%

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

Jabłońska

2021

Molecules

View full text Add to dashboard Cite

A recent development for selective ammonia oxidation into nitrogen and water vapor (NH3-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH3) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH3 emissions is proposed, NH3 emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH3 oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH3 conversion, high selectivity to N2O and NOx as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.

show abstract

“…In a recent paper [28], MgO, ZnO and Nb 2 O 5 , representative of three different types of oxides (basic, amphoteric and acidic, respectively), were used as supports for Au NPs. It was found that the catalytic activity is influenced by the electron mobility between the Au NPs and the support, which depends on the intermediate electronegativity of the support.…”

Section: Evmentioning

confidence: 99%

Effect of Gold Electronic State on the Catalytic Performance of Nano Gold Catalysts in n-Octanol Oxidation

et al. 2020

Self Cite

View full text Add to dashboard Cite

This study aims to identify the role of the various electronic states of gold in the catalytic behavior of Au/MxOy/TiO2 (where MxOy are Fe2O3 or MgO) for the liquid phase oxidation of n-octanol, under mild conditions. For this purpose, Au/MxOy/TiO2 catalysts were prepared by deposition-precipitation with urea, varying the gold content (0.5 or 4 wt.%) and pretreatment conditions (H2 or O2), and characterized by low temperature nitrogen adsorption-desorption, X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDX), scanning transmission electron microscopy-high angle annular dark field (STEM HAADF), diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy of CO adsorption, temperature-programmable desorption (TPD) of ammonia and carbon dioxide, and X-ray photoelectron spectroscopy (XPS). Three states of gold were identified on the surface of the catalysts, Au0, Au1+ and Au3+, and their ratio determined the catalysts performance. Based on a comparison of catalytic and spectroscopic results, it may be concluded that Au+ was the active site state, while Au0 had negative effect, due to a partial blocking of Au0 by solvent. Au3+ also inhibited the oxidation process, due to the strong adsorption of the solvent and/or water formed during the reaction. Density functional theory (DFT) simulations confirmed these suggestions. The dependence of selectivity on the ratio of Brønsted acid centers to Brønsted basic centers was revealed.

show abstract

The effect of support properties on n-octanol oxidation performed on gold – silver catalysts supported on MgO, ZnO and Nb2O5

Cited by 9 publications

References 36 publications

Bimetallic Gold-Palladium Nanoparticles: Applications in Methanol and Ethanol Oxidation Reactions

Bimetallic Gold-Palladium Nanoparticles: Applications in Methanol and Ethanol Oxidation Reactions

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

Effect of Gold Electronic State on the Catalytic Performance of Nano Gold Catalysts in n-Octanol Oxidation

Contact Info

Product

Resources

About