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Methane decomposition and catalyst regeneration in a cyclic mode over supported Co and Ni catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42812 45942 2008 9 PDF Available
Title
Methane decomposition and catalyst regeneration in a cyclic mode over supported Co and Ni catalysts
Abstract

CH4 decomposition (CH4 → C + 2H2) on supported Co and Ni catalysts has been studied using a fixed-bed, oscillating microbalance reactor and a 5% CH4 in He feed reacted at 773 K and 101 kPa. After 45 min reaction the catalysts were regenerated by reaction of the deposited carbon with O2 or CO2 at 773 K and 101 kPa. The effect of repeated CH4 decomposition–carbon oxidation cycles is reported. At the chosen conditions, Ni was more active and more stable than Co during the CH4 decomposition step. Although >90% of the carbon deposited on both Co and Ni was removed by reaction with O2, an oxidation of the active metal also occurred. In subsequent CH4 decomposition steps, an induction period was necessary to re-reduce the Co. Furthermore, the oxidized metal reacted with CH4 producing CO and CO2 as an impurity in the H2. Removal of the carbon deposit by reaction with CO2 rather than O2 significantly decreased the CO contamination of the produced H2 on the Ni catalyst. However, the carbon removal rate was 20×'s slower with CO2 compared to O2. Several CH4 decomposition–carbon oxidation cycles were completed on the Ni catalyst without a significant loss in activity, whereas the Co catalyst deactivated.

Graphical abstractCH4 decomposition (CH4 → C + 2H2) and catalyst regeneration by reaction of the deposited carbon with O2 or CO2 are reported for repeated CH4 decomposition–carbon oxidation cycles. At the chosen conditions, Ni was more active and more stable than Co over several cycles. However, catalyst regeneration resulted in oxidation of the catalysts and CO contamination of the H2 in subsequent CH4 decomposition steps. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methane decomposition; Partial oxidation; Carbon; Catalyst; Cobalt; Nickel; Cyclic reaction
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Methane decomposition and catalyst regeneration in a cyclic mode over supported Co and Ni catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 349, Issues 1–2, 31 October 2008, Pages 116–124
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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