Nur , Hadi and Ng, Yun Hau and Misnon, Izan Izwan and Hamdan, Halimaton and Muhid, Mohd Nazlan Mohd (2006) Hydrophobic fluorinated TiO2-ZrO2 as catalyst in epoxidation of 1-octene with aqueous hydrogen peroxide. Materials Letters, 60 (17-18). pp. 2274-2277. ISSN 0167-577X
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Official URL: http://dx.doi.org/10.1016/j.matlet.2005.12.139
A new heterogeneous oxidation catalyst was prepared by impregnation of TiO2 from titanium(IV)tetra-2-propoxide on the surface of ZrO2. The surfaces of TiO2-ZrO2 particles were then modified by the fluorination of ammonium hexafluorosilicate and followed by alkylsilylation of n-octadecyltrichlorosilane (OTS). The resulting catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption isotherm, UV-Vis Diffuse Reflectance (UV-Vis DR), and Energy Dispersive X-Ray Analysis (EDAX) techniques. The catalytic potential of catalysts for oxidation reactions has been verified in the liquid phase epoxidation of 1-octene to 1,2-epoxyoctane with aqueous hydrogen peroxide. It is demonstrated that the fluorination and alkylsilylation enhance the catalytic activity of TiO2-ZrO2. A high catalytic activity of the modified TiO2-ZrO2 was related to the modification of the local environment of titanium active site and increasing the hydrophobicity of catalyst particles by fluorination and alkylsilylation.
|Uncontrolled Keywords:||Hydrophobic fluorinated TiO2â€“ZrO2, epoxidation, fluorination, alkylsilylation|
|Subjects:||T Technology > TP Chemical technology|
|Divisions:||Chemical and Natural Resources Engineering (Formerly known)|
|Deposited By:||Maznira Sylvia Azra Mansor|
|Deposited On:||01 Jan 2009 07:14|
|Last Modified:||01 Jan 2009 07:14|
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