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Preparation of La2O3-V2O5/MCM-41 Catalyst and Performance for Ethylbenzene Dehydrogenation

Author: JiangLi
Tutor: LiuBingZuo
School: Tianjin University
Course: Physical and chemical
Keywords: Dehydrogenation of ethylbenzene Carbon dioxide oxidant La2O3-V2O5 active component MCM-41 Styrene synthesis Carbon deposition
CLC: TQ241
Type: Master's thesis
Year: 2007
Downloads: 68
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Abstract


Styrene as an important polymer monomer , is widely used in chemical production of them . Industry , mainly through the dehydrogenation of ethylbenzene (EBDH) system in the process . Specifically ethylbenzene and water vapor to occur in the transition metal catalyst of the improved dehydrogenation reaction. Since this reaction is a highly endothermic reaction , the whole reaction process is subject to the restrictions of a thermodynamic equilibrium . Therefore required to consume a large amount of heat , and to ensure that water in the gaseous state . CO 2 as an optional mild oxidant aroused great attention of the people . The investigators used a variety of different metal oxides as active components or auxiliaries , also using a different carrier , in order to improve the catalytic activity of the catalyst . V -based catalyst, having excellent activity in the dehydrogenation reaction of ethylbenzene . This article by La 2 O 3 as an additive to the catalyst system as active component in V , MCM-41 as a carrier , can be achieved to enhance the catalyst activity and stability sexual purposes , and eventually get a good result . MCM-41 used in this experiment as a catalyst carrier . MCM-41 is widely used because of its unique pore structure of the catalyst carrier . MCM-41 having a large specific surface area (approximately 700 m 2 / g ) and a thicker hole wall , the pore size of about 3 nm . In many of the dehydrogenation of ethylbenzene to study , the most important question is how to improve the activity of the catalyst . Therefore , we developed a La 2 O 3 -V 2 O 5 / MCM-41 catalyst , used in the preparation method is the traditional wet impregnated, and its application to CO 2 the presence of the dehydrogenation reaction of ethylbenzene , to confirm it can effectively improve the conversion of ethylbenzene by the investigation of its catalyst activity , and improve the selectivity of styrene . Catalyst characterization methods used X-ray diffraction ( XRD ) , BET specific surface area analysis , Fourier transform infrared spectroscopy ( FT - IR) , X - ray energy spectrum analysis (XPS) and high resolution transmission electron microscope technology ( HRTEM ) .

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