Fine-tuning the local structure and catalytic activity of titanium-amine functionalized silica in oxidation of limonene by aqueous hydrogen peroxide

2012 ◽  
Vol 20 ◽  
pp. 85-88 ◽  
Author(s):  
Lai Sin Yuan ◽  
Jon Efendi ◽  
Nur Syafiqa Hazirah Razali ◽  
Hadi Nur
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Local Structure ◽  
Fine Tuning ◽  
Functionalized Silica ◽  
Aqueous Hydrogen Peroxide ◽  
Amine Functionalized

Titanium Dioxide-Supported Sulfonated Low Rank Coal as Catalysts in the Oxidation of Styrene with Aqueous Hydrogen Peroxide

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
Mukhamad Nurhadi ◽  
Jon Efendi ◽  
Lee Siew Ling ◽  
Teuku Meurah Indra Mahlia ◽  
Ho Chin Siong ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Catalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Low Rank ◽  
Bet Surface Area ◽  
High Catalytic Activity ◽  
Low Rank Coal ◽  
X Ray Diffraction ◽  
Aqueous Hydrogen Peroxide

Titanium dioxide supported sulfonated low rank coal catalyst possesses high catalytic activity in liquid phase oxidation of styrene with aqueous hydrogen peroxide at room temperature. The catalysts were prepared by sulfonation with concentrated sulfuric acid and impregnation of titanium dioxide (500-2500 µmol). The effect of titanium dioxide impregnation and calcinations on the catalysts were studied by X-ray diffraction, UV-vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, BET surface area, field emission scanning electron microscopy and hydrophobicity measurement. The catalytic activity of the catalysts in the oxidation of styrene by aqueous H2O2 without calcination increased when the amount of titanium dioxide increased. Meanwhile, the catalytic activity of the catalyst calcined at 500oC for 2 h was lower than before calcination. It is suggested that the agglomeration of titanium dioxide and hydrophobicity play important role in the catalytic activity of titanium dioxide-supported sulfonated low rank coal in the oxidation of styrene with aqueous H2O2. 

Magnetically recoverable porphyrin-based nanocatalysts for the effective oxidation of olefins with hydrogen peroxide: a comparative study

2020 ◽  
Vol 44 (44) ◽  
pp. 19385-19392
Author(s):  
Saeed Rayati ◽  
Dana Moradi ◽  
Fatemeh Nejabat
Keyword(s):  
Hydrogen Peroxide ◽  
Magnetic Nanoparticles ◽  
Comparative Study ◽  
Amide Bond ◽  
Functionalized Silica ◽  
Simple Method ◽  
Amine Functionalized ◽  
Oxidation Of Olefins

A simple method for the functionalization of magnetic nanoparticles, which is achieved by the attachment of metalloporphyrin onto the surface of amine functionalized silica-coated magnetic nanoparticles via an amide bond.

scholarly journals Modification of Coal Char-loaded TiO2 by Sulfonation and Alkylsilylation to Enhance Catalytic Activity in Styrene Oxidation with Hydrogen Peroxide as Oxidant

2017 ◽  
Vol 12 (1) ◽  
pp. 55 ◽  
Author(s):  
Mukhamad Nurhadi
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Active Sites ◽  
Catalyst Particle ◽  
Local Environment ◽  
Coal Char ◽  
Low Rank ◽  
High Catalytic Activity ◽  
Styrene Oxidation ◽  
Aqueous Hydrogen Peroxide

<p>The modified coal char from low-rank coal by sulfonation, titanium impregnation and followed by alkyl silylation possesses high catalytic activity in styrene oxidation. The surface of coal char was undergone several steps as such: modification using concentrated sulfuric acid in the sulfonation process, impregnation of 500 mmol titanium(IV) isopropoxide and followed by alkyl silylation of n-octadecyltriclorosilane (OTS). The catalysts were characterized by X-ray diffraction (XRD), IR spectroscopy, nitrogen adsorption, and hydrophobicity. The catalytic activity of the catalysts has been examined in the liquid phase styrene oxidation by using aqueous hydrogen peroxide as oxidant. The catalytic study showed the alkyl silylation could enhance the catalytic activity of Ti-SO<sub>3</sub>H/CC-600(2.0). High catalytic activity and reusability of the o-Ti-SO<sub>3</sub>H/CC-600(2.0) were related to the modification of local environment of titanium active sites and the enhancement the hydrophobicity of catalyst particle by alkyl silylation. Copyright © 2017 BCREC GROUP. All rights reserved</p><p><em>Received: 24<sup>th</sup> May 2016; Revised: 11<sup>st</sup> October 2016; Accepted: 18<sup>th</sup> October 2016</em></p><p><strong>How to Cite:</strong> Nurhadi, M. (2017). Modification of Coal Char-loaded TiO<sub>2</sub> by Sulfonation and Alkylsilylation to Enhance Catalytic Activity in Styrene Oxidation with Hydrogen Peroxide as Oxidant. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 12 (1): 55-61 (doi:10.9767/bcrec.12.1.501.55-61)</p><p><strong>Permalink/DOI</strong>: http://dx.doi.org/10.9767/bcrec.12.1.501.55-61</p><p> </p>

Ti-Containing Silsesquioxane Gels with Tunable Porosity: Preparation and Catalytic Activity for the Epoxidation of Cyclooctene by Aqueous Hydrogen Peroxide

2009 ◽  
Vol 52 (6-7) ◽  
pp. 693-698 ◽  
Author(s):  
Kenji Wada ◽  
Kazuhiko Hirabayashi ◽  
Naoki Watanabe ◽  
Shingo Yamamoto ◽  
Teruyuki Kondo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Aqueous Hydrogen Peroxide
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