scholarly journals Polyol-Free Synthesis of Uniformly Dispersed Pt/Graphene Oxide Electrocatalyst by Sulfuric Acid Treatment

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Tae Kyu Lee ◽  
Hyang Jin Park ◽  
Min Ki Kwon ◽  
Ju Hae Jung ◽  
Junbom Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sulfuric Acid ◽  
Acid Treatment ◽  
Pt Nanoparticles ◽  
Hydroxyl Groups ◽  
Electrochemical Surface Area ◽  
Surface Hydroxyl ◽  
Sulfuric Acid Treatment ◽  
Surface Hydroxyl Groups ◽  
Loading Amount

Polyol-free synthesis of highly loaded Pt catalysts on sulfuric-acid-treated graphene oxide (SGO) was reported. Sulfuric acid treatment increased the surface hydroxyl groups on graphene oxide (GO), which contributed to the reduction of Pt precursors in the absence of external reducing agent. By adjusting pH during the Pt reduction, we can get uniformly dispersed 2.5 nm size Pt nanoparticles on GO surface even at 50 wt% Pt loading amount. Cyclic voltammetry showed that increased pH resulted in increased electrochemical surface area.

Effect of Acid on Surface Hydroxyl Groups on Kaolinite and Montmorillonite

2018 ◽  
Vol 232 (3) ◽  
pp. 409-430 ◽  
Author(s):  
Sarah K. Sihvonen ◽  
Kelly A. Murphy ◽  
Nancy M. Washton ◽  
Muhammad Bilal Altaf ◽  
Karl T. Mueller ◽  
...  
Keyword(s):  
Functional Groups ◽  
Acid Treatment ◽  
Atmospheric Transport ◽  
Magic Angle Spinning ◽  
Resonance Spectroscopy ◽  
Hydroxyl Groups ◽  
Magic Angle ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Angle Spinning

AbstractMineral dust aerosol participates in heterogeneous chemistry in the atmosphere. In particular, the hydroxyl groups on the surface of aluminosilicate clay minerals are important for heterogeneous atmospheric processes. These functional groups may be altered by acidic processing during atmospheric transport. In this study, we exposed kaolinite (KGa-1b) and montmorillonite (STx-1b) to aqueous sulfuric acid and then rinsed the soluble reactants and products off in order to explore changes to functional groups on the mineral surface. To quantify the changes due to acid treatment of edge hydroxyl groups, we use19F magic angle spinning nuclear magnetic resonance spectroscopy and a probe molecule, 3,3,3-trifluoropropyldimethylchlorosilane. We find that the edge hydroxyl groups (OH) increase in both number and density with acid treatment. Chemical reactions in the atmosphere may be impacted by the increase in OH at the mineral edge.

Enhancing the potency of surface hydroxyl groups of graphene oxide for selective oxidation of benzyl alcohol

2018 ◽  
Vol 90 ◽  
pp. 154-165 ◽  
Author(s):  
Ravi Vithalani ◽  
Dikin Patel ◽  
Chetan K. Modi ◽  
Narayan N. Som ◽  
Prafulla K. Jha ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Oxidation Of Benzyl Alcohol

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

scholarly journals Effect of Sulfuric Acid Treatment and Calcination on Natural Zeolites of Indonesia

2016 ◽  
Vol 28 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Ady Mara ◽  
Karna Wijaya ◽  
Wega Trisunaryati Mudasir
Keyword(s):  
Sulfuric Acid ◽  
Acid Treatment ◽  
Natural Zeolites ◽  
Sulfuric Acid Treatment
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