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Dehydrogenation of ethylbenzene in the presence of CO2 using a catalyst synthesized by polymeric precursor method

Paper ID Volume ID Publish Year Pages File Format Full-Text
42773 45940 2009 8 PDF Available
Title
Dehydrogenation of ethylbenzene in the presence of CO2 using a catalyst synthesized by polymeric precursor method
Abstract

Catalysts of iron oxide dispersed on Al or Si oxides were prepared via a polymeric precursor derived from the Pechini method and tested in the dehydrogenation of ethylbenzene in the presence of CO2, in order to contribute with the studies of this reaction. The catalysts were characterized by thermogravimetric analysis (TG), temperature-programmed reduction (TPR), X-ray diffraction (DRX) and temperature-programmed desorption of CO2 (TPD-CO2). Analysis of the spent catalysts by TG and Fourier transformed infrared spectroscopy (FT-IR) pointed to the contribution of CO2 to the coke deposition. The catalytic results suggest that the high initial ethylbenzene conversion is due to the contribution of basic sites, and the CO2 adsorption in the basic site (lattice oxygen) may compete with the oxidative dehydrogenation of ethylbenzene. Although CO2 provides the appropriate conditions to lower the consumption of the basic site, it is not able to promote the Fe2+ oxidation or to regenerate the basic site (lattice oxygen) in the iron oxide dispersed on Al or Si oxide catalysts.

Graphical abstractIs the CO2 able to promote the Fe2+ oxidation or to regenerate the basic site (lattice oxygen) in the iron oxide during the dehydrogenation of ethylbenzene? The experimental results presented herein, using catalysts synthesized by the polymeric precursor method, provide information to the studies of the role of CO2 in the reaction.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Carbon dioxide; Dehydrogenation; Ethylbenzene; Styrene
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Dehydrogenation of ethylbenzene in the presence of CO2 using a catalyst synthesized by polymeric precursor method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 366, Issue 1, 15 September 2009, Pages 193–200
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us