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Studies On Catalysts For Epoxidation Of Styrene To Styrene Oxide

Posted on:2011-08-13Degree:MasterType:Thesis
Country:ChinaCandidate:P P QiuFull Text:PDF
GTID:2121360305452029Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
Styrene oxide is widely used in the fields of synthetic perfume, pharmaceuticals, epoxy resin, UV-absorbent as one of most important chemical intermediates. With the demand ofβ- phenylethanol and levamisole hydrochloride increasing, the demand of styrene oxide is also growing. However, the traditional production methods are low yield, high cost and difficulties in products separation and purification, and serious environmental pollution, making it difficult to meet the market needs. Therefore, this years, the production process of styrene oxide has been concerned, the current major task is to research and develop a catalyst which is easier preparated and inexpensive, nonpollution to the environment, or find a more concise and efficient synthetic route for solving this problem.Nano-metal oxides often show very high catalytic activity for epoxidation of styrene, which have large specific surface and high surface atoms occupancy probability, and unsaturated coordinated surface atoms. In the catalytic field, the effective synthesis of nano-catalyst can optimize the existing systems and the reaction pathway, improve catalytic efficiency or product selectivity. New and efficient catalytic materials or new catalytic reactions will promote the development of catalytic science.The main works focuse on the following aspects:1. The Nano-NiO and Nano- Co3O4 was abtained by precipitation method, and the Non nao-NiO and Non nano- Co3O4 was abtained by Thermal Decomposition Method. Additionally, combined with the related of XRD, FT-IR, SEM Characterization results, the crystal structure and surface properties of the catalysts were studied;2. Nano-NiO was used as the catalyst for the oxidation of styrene to study the influence of the reaction conditions, such as the time, the temperature, the solvents, the amount of acetonitrile and the oxidants, and the catalytic activities of the nano-metal oxides and nano-metal oxides were compared;3. Fe, Co and Cu complexes of 8-hydroxyquinoline encapsulated in Zeolite-Y have been synthesized by the flexible ligand method. The hybrid materials obtained have been characterized by XRD, SEM, FT-IR, UV-Vis techniques;4. The catalytic activities of these encapsulated complexes, neat complexes and ion-exchanged Y Zeolite as catalysts for the oxidation of styrene under same reaction conditions have also been tested for comparison.
Keywords/Search Tags:Styrene, Styrene oxide, Nano-metal oxide, Metal 8-hydroxyquinoline complex, Flexible ligand method
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