Oxidative dehydrogenation of ethylbenzene with CO2 for styrene production over porous iron-based catalysts

FUEL

卷:108

Article

Castro, Antonio J. R.¹  Soares, Joao M.²  Filho, Josue M.¹  Oliveira, Alcineia C.¹  Campos, Adriana³  Milet, Edwin R. C.³ 

[1] Univ Fed Ceara, Dept Fis, Dept Quim Analit & Fis Quim, Campus Pici Bloco 922, Fortaleza, Ceara, Brazil

[2] Univ Estado Rio Grande do Norte, BR-59625620 Mossoro, RN, Brazil

[3] CETENE, Recife, PE, Brazil

关键词: Porous iron oxides;    Characterizations;    Dehydrogenation;    Ethylbenzene;    Carbon dioxide;   

DOI  :  10.1016/j.fuel.2013.02.019

来源: Elsevier

【 摘 要 】

Porous iron-based catalysts with different promoters (Zr, Ti or Al) have been tested in oxidative dehydrogenation of ethylbenzene with CO2 for styrene production. The catalysts were characterized by X-ray diffraction (XRD), Fe-57-Mossbauer and Raman spectroscopy, temperature-programmed reduction (TPR) and N-2 adsorption-desorption measurements, before and after the catalytic evaluation. The reactivity of iron-based catalysts toward styrene production was dependent on the structural and textural features of the solid as well as the nature of the promoter. alpha-Fe2O3 and rutile TiO2 present on FeTi were converted in situ into FeTiO3, Fe2TiO5 and FeTi2O5, and these phases revealed a high styrene yield (up to 50%) in the first stage of the reaction, but lower selectivity than that exhibited by their FeZr and FeAl counterparts. However, FeTi performed much better in terms of stability showing no tendency to sintering or phase transformation whereas the other solids suffered from hard carbon deposition. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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