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Oxidative dehydrogenation of isobutane over activated carbon catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44647 46050 2006 7 PDF Available
Title
Oxidative dehydrogenation of isobutane over activated carbon catalysts
Abstract

In past work, we reported on the textural and chemical modifications induced by treating an activated carbon under nitrous oxide, oxygen and hydrogen. In this work, we are reporting on the testing of surface modified activated carbons in the oxidative dehydrogenation of isobutane (ODHI). The results show that the different treatments lead to a given catalytic performance associated with the degree of oxidation. At 648 K, isobutene yields are higher in the initial stages for the activated carbons with the highest amounts of carbonyl/quinone groups on the surface, which are considered the active sites for this reaction, and the isobutene yields are lower for the catalysts with lower concentrations of these groups. As the reaction proceeds, the reactant mixture (isobutene–oxygen and argon as carrier gas) is able to introduce active sites onto the carbon surface to the point where they are stabilized for the case of treatment in H2 and without pretreatment. For the other treatments, N2O and oxygen, the active sites are rearranged and stabilized after a while. It is observed that there is a tendency towards a similar CO/CO2 relationship as measured by TPD, corresponding to a yield of about 7% after 5 h of reaction.

Keywords
Activated carbon; Surface treatment; Catalytic properties; Oxidative dehydrogenation; Functional groups
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 311, 1 September 2006, Pages 51–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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