Oxygen Reduction on Platinum in Trifluoromethane Sulfonic Acid

1978 ◽  
Vol 125 (3) ◽  
pp. 404-406 ◽  
Author(s):  
A. J. Appleby ◽  
B. S. Baker
Keyword(s):  
Oxygen Reduction ◽  
Sulfonic Acid ◽  
Trifluoromethane Sulfonic Acid

Acid Reactions of Lignin Models of β-5 Type

Holzforschung ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 39-42 ◽  
Author(s):  
S. Li ◽  
K. Lundquist
Keyword(s):  
Sulfonic Acid ◽  
Starting Material ◽  
Acid Catalysts ◽  
Reaction Products ◽  
Milled Wood Lignin ◽  
H Nmr ◽  
Stilbene Derivative ◽  
Trifluoromethane Sulfonic Acid ◽  
Spectrometric Measurements ◽  
Adjacent Unit

Summary Refluxing of trans–2-(3,4-dimethoxyphenyl)-3-hydroxymethyl-7-methoxy-2,3-dihydrobenzo[b]furan with dioxane-water (9 : 1) in the presence of various acid catalysts led to the formation of 2-(3,4-dimethoxyphenyl)- 7-methoxy-3-methylbenzo[b]furan, the trans and cis forms of 2-hydroxy-3,3′4′-trimethoxystilbene and cis–2-(3,4-dimethoxyphenyl)-3-hydroxymethyl-7-methoxy-2,3-dihydrobenzo[b]furan. The proportions of the products were strongly dependent on the particular acid used as catalyst. HCl and to a greater extent HBr favored the formation of the 2-arylbenzofuran (phenylcoumarone) while the trans-stilbene derivative predominated in reaction products from the experiments with trifluoromethane sulfonic acid as the catalyst. Isomerization of the starting material occurred, regardless of the nature of the catalyst (small amounts of the cis-isomer formed). The number of phenylpropane units in spruce lignin attached to an adjacent unit by a β−5 linkage was estimated to be 6–9% on the basis of 1H NMR spectrometric measurements of the formation of phenylcoumarone structures on refluxing of milled wood lignin from spruce with 0.1M HBr in dioxane-water (9 : 1).

Effect of the Side-Chain Structure of Perfluoro-Sulfonic Acid Ionomers on the Oxygen Reduction Reaction on the Surface of Pt

ACS Catalysis ◽  
2017 ◽  
Vol 8 (1) ◽  
pp. 694-700 ◽  
Author(s):  
Kensaku Kodama ◽  
Kenta Motobayashi ◽  
Akihiro Shinohara ◽  
Naoki Hasegawa ◽  
Kenji Kudo ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Sulfonic Acid ◽  
Chain Structure ◽  
Reduction Reaction ◽  
Side Chain

scholarly journals Oxygen Reduction Reaction of Carbon Nanotubes Supported Polypyrrole Doped Toluene Sulfonic Acid in Alkaline Medium

2019 ◽  
Vol 7 (4.14) ◽  
pp. 473
Author(s):  
Rika Sri Utami ◽  
Wai Yin Wong ◽  
Edy Herianto Majlan ◽  
Kee Shyuan Loh
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Sulfonic Acid ◽  
Oxidative Polymerization ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Alkaline Condition ◽  
X Ray ◽  
Toluene Sulfonic Acid

In this study, polypyrrole/toluene sulfonic acid-based nitrogen doped carbon nanotube (NCNT) is synthesized via chemical oxidative polymerization followed by high-temperature heat treatment under N2 atmosphere. The structure, morphology and composition of the NCNT catalyst are investigated with X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. Different N species including pyridinic, pyrrolic, graphitic, and oxidized-N are quantitatively determined by X-ray photoelectron spectroscopy (XPS). The electrocatalytic activity of NCNT towards oxygen reduction reaction (ORR) in alkaline condition is evaluated with cyclic voltammetry (CV) and rotating disk electrode (RDE). The globular and tubular structure of NCNT can be clearly seen from SEM images. The typical Raman spectrum for NCNT showed two prominent bands around 1348 cm-1 (D band) and 1568 cm-1 (G band). High-resolution XPS spectrum of N 1s for NCNT showed that graphitic-N has the highest percentage (39.36%), whereas the pyridinic-N (26.54%), pyrrolic-N (18.88%) and oxidized-N (15.22%). The ORR electrocatalytic activity of the NCNT in 0.1 M KOH has the onset potential of -0.154 V vs. Ag/AgCl, the current density 0.455 mA/cm2, and electron transfer number of n ≈ 4.  

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