Dehydrogenation of ethylbenzene to styrene catalyzed by Co, Mo and CoMo catalysts supported on natural and aluminum-pillared clays -: Effect of the metal reduction

被引:27
|
作者
Moronta, Alexander
Troconis, Maria E.
Gonzalez, Eduardo
Moran, Cesar
Sanchez, Jorge
Gonzalez, Angel
Quinonez, Jackeline
机构
[1] Univ Zulia, Fac Ingn, Inst Superficies & Catalisis, Maracaibo 4003A, Venezuela
[2] Univ Rafael Urdaneta, Fac Ingn, Escuela Ingn Quim, Maracaibo, Venezuela
[3] Univ Zulia, Fac Ciencias Expt, Unidad Acad Quim Inorgan, Maracaibo 4011, Venezuela
[4] Cent Univ Venezuela, Lab Caracterizac Mat, Caracas, Venezuela
关键词
clays; CoMo catalysts; ethylbenzene dehydrogenation; pillared clays;
D O I
10.1016/j.apcata.2006.06.003
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
In this work Co, Mo and CoMo catalysts supported on a montmorillonite clay (STx-1, Texas, USA) in its natural and Al-pillared forms were prepared. These catalysts in their unreduced and reduced forms were tested over the dehydrogenation of ethylbenzene to study the effect of the metal reduction. The catalysts were prepared by impregnation with aqueous solutions of CoCl2 center dot 6H(2)O and (NH4)(6)Mo7O24 center dot 4H(2)O and characterized by N-2 adsorption, X-ray diffraction, temperature programmed reduction and CO chemisorption. The total metal content of cobalt and/or molybdenum was 4 wt.% in the monometallic and bimetallic catalysts, varying the Co-Mo mass ratio in 1:3, 2:2 and 3:1 (Co:Mo atomic ratios of 0.54, 1.63 and 4.84) in the latter. The surface areas of the natural and Al-pillared clays were 72 and 123 m(2)/g, while the areas of the Co, Mo and CoMo catalysts supported on ST and Al-ST were 48-69 and 77-89 m(2)/g. The reduction profiles revealed the presence of different Co and Mo species and the existence of metal-support interactions. The use of cobalt chloride formed particles of large sizes and Cl- blocks the active sites. The reduced catalysts showed greater activity than the unreduced catalysts at 400 degrees C. The most active catalysts were the one that contained 4 wt.% of Mo (in the monometallic) and that with the higher Mo content (in the bimetallic). (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:199 / 204
页数:6
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