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CO2 reforming of methane to syngas over highly active and stable supported CoOx (accompanied with MgO, ZrO2 or CeO2) catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43736 45986 2007 6 PDF Available
Title
CO2 reforming of methane to syngas over highly active and stable supported CoOx (accompanied with MgO, ZrO2 or CeO2) catalysts
Abstract

Catalytically inactive CoOx–MgO (calcined at 900 °C) becomes highly active and selective in the CO2 reforming of methane to syngas when it is deposited on a commercial low surface-area macro-porous silica–alumina support (SA-5205) or when CoOx is deposited on the support precoated with MgO. Both the supported CoOx and MgO containing catalysts (CoOx–MgO/SA-5205 and CoOx/MgO/SA-5205) show high methane conversion (>98%) activity and H2 selectivity (>94%) and also high stability against carbon deposition [rate of carbon deposition ≤ 0.26 mg (C) g (catalyst)−1 h−1] in the CO2 reforming (at 850 °C, GHSV = 20,000 cm3 g−1 h−1). The CoOx/MgO/SA-5205 is, however, more active and stable than the CoOx–MgO/SA-5205. The supported catalyst prepared by depositing CoOx on SA-5205 precoated with ZrO2, CeO2, Y2O3 or ThO2 also shows very high stability against the carbon deposition [rate of carbon deposition < 0.1 mg(C) g(catalyst)−1 h−1]. The choice of the metal oxide used for precoating the support for achieving better catalyst performance is in the following order: MgO > ZrO2 > CeO2 > Y2O3 > ThO2. The type of support (silica–alumina or zirconia–haffnia) also plays important role in deciding the catalyst performance; the catalysts with the commercial zirconia-haffnia support (SZ-5564) show, in general, poor activity with higher rates carbon deposition. In the absence of MgO or the other metal oxide, the catalyst (CoOx/SA-5205 or SZ-5564) shows very poor activity with higher carbon deposition rate.

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Keywords
Supported CoOx catalysts; CO2 reforming of methane; Carbon formation in CO2 reforming of methane; Syngas
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CO2 reforming of methane to syngas over highly active and stable supported CoOx (accompanied with MgO, ZrO2 or CeO2) catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 316, Issue 1, 2 January 2007, Pages 47–52
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