In situ FTIR investigation of acetic acid electrooxidation on carbon supported Pt–Sn based trimetallic catalysts: Influence of the nature of the third metal

Beyhan, Seden; Léger, Jean‐Michel; Kadırgan, F.

doi:10.1016/j.apsusc.2014.10.051

Cited by 21 publications

(17 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on geometric considerations, it is most likely that oxalate adsorbs to α-Ni(OH) 2 in the horizontal orientation as a planar molecule. However, the vertical adsorption orientation is also a possibility considering that acetate, which has a similar structure and also a spacing of 2.2 Å between the two oxygen atoms, tends to bond to Ni, Pt, and other metal surfaces via both oxygen atoms in a bridge configuration [41,42]. Regardless of adsorption orientation, the C-O bond vibration of oxalate will be affected by the adsorption process as the interaction between Ni and O alters the C-O bond strength.…”

Section: Resultsmentioning

confidence: 98%

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

2015

View full text Add to dashboard Cite

The electrochemical formation of α-Ni(OH) 2 and NiOOH in the presence of adsorbed oxalate in alkaline media is studied under well-controlled experimental conditions that include the variation of the system temperature (T=−10 to 20°C), the scan rate (v=20, 150, and 200 mV s −1 ), and the concentration of supporting electrolyte (0.10 and 0.50 M KOH). The studies are carried out using cyclic voltammetry (CV) with polycrystalline bulk nickel and nickel foams. In situ infrared spectroscopy with voltammetry confirms the adsorption of oxalate to the surface of nickel in the 0.10 to 0.30 V potential window, concurrent with the formation of the α-Ni(OH) 2 species. The presence of oxalate in the system increases the charge density (Q) for the formation of both the α-Ni(OH) 2 and NiOOH surface oxides. The Q values calculated under various conditions indicate that the presence of oxalate in the system encourages the formation of a full single monolayer (ML) of NiOOH in the first CV scan. Measurements carried out at room temperature demonstrate that an increase in v decreases the Q values for NiOOH in the presence of oxalate to minimum values achieved at v ≥150 mV s −1 . An increase of KOH concentration results in the formation of a thicker layer of NiOOH both in the presence and absence of oxalate. The Q values of NiOOH reduction in conditions that favor the formation of one complete monolayer of NiOOH are used to calculate the specific surface areas of open-cell nickel foams. The calculation of electrochemical surface area using this method is discussed and evaluated with respect to calculations based on the charge of α-Ni(OH) 2 formation.

show abstract

Section: Resultsmentioning

confidence: 98%

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

2015

View full text Add to dashboard Cite

show abstract

“…The adsorption of EA on 3%‐NL/N, 3%‐N/N (Ni/Na), and 3%‐L/N (La/Na) and NL (NiLa) with adsorption times of 10 and 20 min is shown in Figure a and Figure b, respectively. The bands at 1758–1770 cm −1 are assigned to CO stretching frequency (ν CO ) . The bands at 1240, 1374, and 1436 cm −1 are related to CO stretch, CH stretch, and CO stretch, respectively .…”

Section: Resultsmentioning

confidence: 99%

Key Role of Lanthanum Oxychloride: Promotional Effects of Lanthanum in NiLaO_y/NaCl for Hydrogen Production from Ethyl Acetate and Water

Xue

Shen

et al. 2018

Small

View full text Add to dashboard Cite

The hydrogen economy is accelerating technological evolutions toward highly efficient hydrogen production. In this work, the catalytic performance of NiO/NaCl for hydrogen production via autothermal reforming of ethyl acetate and water is further improved through lanthanum modification, and the resulted 3%-NiLaO /NaCl catalyst achieves as high as 93% H selectivity and long-term stability at 600 °C. The promoting effect is caused by the strong interactions between lanthanum and NiO/NaCl, by which LaNiO and a novel LaOCl phase are formed. The key role of LaOCl in promoting low-temperature hydrogen production is highlighted, while effects of LaNiO are well known. The LaOCl (010) facet possesses high adsorption capacity toward co-chemisorbing ethyl acetate and water. LaOCl strongly interacts with ethyl acetate and H O in the form of hydrogen bonding and coordination effect. The interactions induce tensions inside ethyl acetate and H O, activate the molecules, and hence decrease the energy barrier for reaction. In situ Fourier transform infrared spectroscopy (FTIR) reveals that LaOCl along with NaCl enhances the adsorption ability of NiO/NaCl. Moreover, LaOCl improves the dispersion of Ni species in NiO-LaNiO -LaOCl nanosheets, which possess abundant active sites. The effects together promote hydrogen evolution. Furthermore, the NiLaO /NaCl catalyst can be easily reborn after deactivation due to the water solubility of NaCl.

show abstract

“…Firstly, the CVs measured in EAA at 89 °C immediately after its complete melting are shown in Figure a‐(I). A cathodic current corresponding to the discharge of hydrogen from AcOH is observed at E<−0.5 V, and an anodic current is established at E>1.6 V. Such process is too anodic (as compared to previous CVs) to be assigned to the oxidation of free EA, and is most likely coming from the oxidation of free AcOH . However, these currents are not stable during the timeframe of the experiment and decrease upon successive cycling.…”

Section: Resultsmentioning

confidence: 79%

“…The electrolyte was saturated with inert gas (dry N 2 ) by continuous bubbling. CVs were measured between a cathodic potential that was negative enough (<−0.7 V) to detect hydrogen evolution from the free acid, and an anodic potential that was high enough (>1.2 V) to detect the electro‐oxidation of free alkyl amine or AcOH . The potential incursion over such anodic values also allowed to keep the electrode free of fouling by amine or acid adsorption .…”

Section: Methodsmentioning

confidence: 99%

Understanding the Role of Protic Ionic Liquids (PILs) in Reactive Systems: Rational Selection of PILs for the Design of Green Synthesis Strategies for Allylic Amines and β‐Amino Esters

et al. 2019

View full text Add to dashboard Cite

The reactive behaviour of protic ionic liquids (PILs) has been shown to be governed not only by their chemical structures but also by their global compositions, which include the presence of free acids and bases at equilibrium with ionic pairs. Six PILs composed of primary, secondary, or tertiary alkyl ammonium cations with two couterions, nitrate or acetate, were tested in model reactions with unsaturated substrates. The free species that were naturally present in these liquids were identified by cyclic voltammetry. Only tributylammonium nitrate was found to be mostly composed just of the ionic pair; the other five PILs also contain variable amounts of free acid and amine. In reactive systems, these free species determine the products of the reaction. In particular, allylic amines and β‐amino esters were obtained in good yields (91 and 75 %, respectively) by reaction of conjugated dienes and acrylates in the presence of PILs. By taking into account the actual composition of each PIL, it was possible to direct the reaction path towards a specific product with good yields, to ensure acid catalysis, to avoid polymerization of the substrate, and to promote phase transfer of products. These results establish some useful guidelines for the rational design of new PIL‐based one‐step synthetic strategies.

show abstract

In situ FTIR investigation of acetic acid electrooxidation on carbon supported Pt–Sn based trimetallic catalysts: Influence of the nature of the third metal

Cited by 21 publications

References 27 publications

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

Key Role of Lanthanum Oxychloride: Promotional Effects of Lanthanum in NiLaO_y/NaCl for Hydrogen Production from Ethyl Acetate and Water

Understanding the Role of Protic Ionic Liquids (PILs) in Reactive Systems: Rational Selection of PILs for the Design of Green Synthesis Strategies for Allylic Amines and β‐Amino Esters

Contact Info

Product

Resources

About

In situ FTIR investigation of acetic acid electrooxidation on carbon supported Pt–Sn based trimetallic catalysts: Influence of the nature of the third metal

Cited by 21 publications

References 27 publications

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

Key Role of Lanthanum Oxychloride: Promotional Effects of Lanthanum in NiLaOy/NaCl for Hydrogen Production from Ethyl Acetate and Water

Understanding the Role of Protic Ionic Liquids (PILs) in Reactive Systems: Rational Selection of PILs for the Design of Green Synthesis Strategies for Allylic Amines and β‐Amino Esters

Contact Info

Product

Resources

About

Key Role of Lanthanum Oxychloride: Promotional Effects of Lanthanum in NiLaO_y/NaCl for Hydrogen Production from Ethyl Acetate and Water