Nanosized aluminum derived oxides catalysts prepared with different methods for styrene production

被引:28
作者
Castro, Antonio J. R. [2 ]
Marques, Samuel P. D. [1 ]
Soares, Joao M. [3 ]
Filho, Josue M. [2 ]
Saraiva, Gilberto D. [4 ]
Oliveira, Alcineia C. [1 ]
机构
[1] Univ Fed Ceara, Langmur Lab Adsorcao & Catalise, BR-60000000 Fortaleza, Ceara, Brazil
[2] Univ Fed Ceara, Dept Fis, BR-60000000 Fortaleza, Ceara, Brazil
[3] Univ Estado Rio Grande do Norte, BR-59625620 Mossoro, RN, Brazil
[4] Univ Estadual Ceara, Fac Educ Ciencias & Letras Sertao Cent, BR-63900970 Quixada, CE, Brazil
关键词
Characterizations; Catalysts; Dehydrogenation; Preparation method; Ethylbenzene; ETHYLBENZENE DEHYDROGENATION; OXIDATIVE DEHYDROGENATION; CARBON-DIOXIDE; ACTIVATED CARBON; GAMMA-ALUMINA; SPINEL OXIDES; RAMAN; TS-1; CO2; FE;
D O I
10.1016/j.cej.2012.07.094
中图分类号
X [环境科学、安全科学];
学科分类号
083001 [环境科学];
摘要
Various MOx-Al2O3 binary oxides catalysts (M: Fe, Ti, La, and Zr) with MOx molar percentage of 20% were prepared via three different synthetic approaches, i.e., hydrothermal synthesis, nanocasting and sol-gel methods. Characterizations by XRD and TEM showed the existence of nanosized rutile TiO2, tetragonal ZrO2, 12203, gamma-Fe2O3, alpha-Fe2O3 and gamma-Al2O3 phases. Fe-57 Mossbauer showed that either gamma-Fe2O3 or alpha-Fe2O3 phases formation on alumina is likely over Fe sol-gel derived catalyst. All solids had elevated surface area and pore volumes, being well suited in mesoporous materials range. The results indicated that structure and texture of sol-gel derived solids resulted in solid solutions and/or nanoparticles dispersed on alumina compared to the other methods. Best performances in the oxidative dehydrogenation of ethylbenzene with CO2 were obtained over FeOx-Al2O3 and TiOx-Al2O3. The Fe-containing alumina had elevated ethylbenzene conversion whereas styrene selectivity was similar to their Ti-counterparts; however, coking resistance and thermal stability was higher over Fe-containing alumina obtained by sol-gel. This was attributed to the advantaged synergistic effect among gamma-Fe2O3, alpha-Fe2O3 and gamma-Al2O3 under reduction environments that resulted in stable FeAl2O4 formation during the reaction. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:345 / 355
页数:11
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