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

Paper ID Volume ID Publish Year Pages File Format Full-Text
44041 46000 2006 6 PDF Available
Title
Dehydrogenation of ethylbenzene to styrene catalyzed by Co, Mo and CoMo catalysts supported on natural and aluminum-pillared clays: Effect of the metal reduction
Abstract

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 CoCl2·6H2O and (NH4)6Mo7O24·4H2O and characterized by N2 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 m2/g, while the areas of the Co, Mo and CoMo catalysts supported on ST and Al-ST were 48–69 and 77–89 m2/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 °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).

Keywords
Clays; CoMo catalysts; Ethylbenzene dehydrogenation; Pillared clays
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Dehydrogenation of ethylbenzene to styrene catalyzed by Co, Mo and CoMo catalysts supported on natural and aluminum-pillared clays: Effect of the metal reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 310, 17 August 2006, Pages 199–204
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us