Papers by Keyword: Hybrid Catalyst

Abstract: Organic/inorganic support for immobilizing hybrid catalyst (Cp₂ZrCl₂/ TiCl₄) was devised. Silica was the inorganic part using in the immobilization of Cp₂ZrCl₂. Subsequently, styrene and acrylic copolymer (PSA) was coated on the silica. TiCl₄ was finally supported on the PSA. PSA layer played obvious barrier ability to triethylaluminium (TEA) in the support which was observed by ethylene polymerization. This outstanding barrier property dramatically restrained the toxic effect of TEA to Cp₂ZrCl₂. Thus, the property of Cp₂ZrCl₂ could be maintained using cocatalyst TEA. Bimodal polyethylene was achieved cocatalysted by TEA.

Abstract: Direct dimethyl ether synthesis catalysts containing different content of SiO2 are prepared by spray drying method and characterized by XRD, N2 adsorption, and Polarizing Microscope. It is found that the spray drying process improved the spherical of the catalyst particles and the attrition resistance of the catalyst is increased by the addition of SiO2. The SiO2 formed a framework throughout the catalyst and has little effect on the morphology of CuO, ZnO and HZSM-5. The activity of the catalyst shows a little decrease with the SiO2 addition.

Abstract: This work compared properties and catalytic performance of two hybrid photocatalysts, TiO2/RH-MCM-41 and TiO2/TEOS-MCM-41 prepared by loading nanoparticles of TiO2 (10 wt.%) on MCM-41 synthesized with rice husk silica and tetraethyl orthosilicate respectively. The supports and catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy and zeta potential. The photocatalytic activities of the TiO2/RH-MCM-41 and TiO2/TEOS-MCM-41 for the degradation of tetramethylammonium (TMA) in aqueous slurry were similar with a complete conversion after irradiation time of 90 min at pH 7.