Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

被引：34
作者：
Ji, Min [1 ]
Zhang, Xiaoyan [1 ]
Wang, Junhu [2 ]
Park, Sang-Eon [3 ,4 ]
机构：
[1] Dalian Univ Technol, Sch Chem, Dalian 116023, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116023, Peoples R China
[3] Inha Univ, Lab Nanogreen Catalysis, Inchon 402751, South Korea
[4] Inha Univ, Dept Chem, Nano Ctr Fine Chem Fus Technol, Inchon 402751, South Korea
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2013年 / 371卷
关键词：
Ethylbenzene dehydrogenation; Spinel; Fe-57 Mossbauer spectroscopy; Synergy; IRON-OXIDE CATALYSTS; AL MIXED OXIDES; OXIDATIVE DEHYDROGENATION; CARBON-DIOXIDE; STYRENE; HYDROTALCITE; PRECURSORS; OXYDEHYDROGENATION; CONVERSION; REDUCTION;
D O I：
10.1016/j.molcata.2013.01.025
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Fe-doped MgAl2O4 spinet catalyst of MgFe0.1Al1.9O4 and supported catalyst of Fe2O3-MgO/gamma-Al2O3 for ethylbenzene dehydrogenation in the presence of CO2 were studied by Mossbauer spectroscopy (MS) combining with the partial reduction method in the presence of H-2, and the catalytic activity of the ferrous iron species was discussed. The results showed that the catalytic performance of Fe3+ existing in spinel is superior to alpha-Fe2O3, and the synergistic effect between Fe2+ and Fe3+ might indeed increase the catalytic activity since Fe2+-O2- formed in the process of reduction has moderate basicity, which was more favorable for desorption of CO2 compared with Mg2+-O2-. The reduced MgFe0.1Al1.9O4 containing Fe2+ of around 25% exhibits much higher catalytic activity than unreduced catalyst, with improved styrene yield nearly 2 times to 45.0%. MgxFe1-xO as another ferrous iron species formed in the reduction process of Fe2O3-MgO/gamma-Al2O3 showed inconspicuously catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
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页码：36 / 41
页数：6
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