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Syngas production by partial oxidation of methane over Pt/CeZrO2/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55595 47058 2012 6 PDF Available
Title
Syngas production by partial oxidation of methane over Pt/CeZrO2/Al2O3 catalysts
Abstract

In this study, we evaluated the effect of ceria–zirconia content on the performance of Pt/x%CeZrO2/Al2O3 (x = 0–40 wt.%) during partial oxidation of methane. X-ray diffraction results indicated that, for samples containing 10 and 20 wt.% of CeZrO2, there was the formation of a homogeneous solid solution between ceria and zirconia. On the other hand, for Pt/30%CeZrO2/Al2O3, there was the formation of a ceria rich phase and a zirconia rich phase whereas a ceria rich phase and an isolated zirconia phase were detected for Pt/40%CeZrO2/Al2O3. Catalytic tests showed that Pt/Al2O3 exhibited a significant deactivation, while Pt/10%CeZrO2/Al2O3 and Pt/20%CeZrO2/Al2O3 practically did not loose their activity after 24 h. A deactivation was detected for Pt/30%CeZrO2/Al2O3 and Pt/40%CeZrO2/Al2O3. The higher stability of the Pt/10%CeZrO2/Al2O3 and Pt/20%CeZrO2/Al2O3 catalysts was attributed to the high reducibility and consequently the high oxygen mobility of the homogeneous solid solution formed, which promoted the mechanism of carbon removal from the metallic particle.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slideHighlights► Samples with 10 or 20 wt.% CeZrO2 presented high stability and CO and H2 formation. ► These samples presented a homogeneous phase of CeZrO2 which led to higher reducibility. ► High oxygen mobility in CeZrO2 promoted the mechanism of carbon removal.

Keywords
Partial oxidation of methane; Pt/CeZrO2/Al2O3 catalysts; Syngas; Hydrogen production
First Page Preview
Syngas production by partial oxidation of methane over Pt/CeZrO2/Al2O3 catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 111–116
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis