Syngas production by partial oxidation of methane over Pt/CeZrO 2/Al 2O 3 catalysts
[Display omitted] ► Samples with 10 or 20 wt.% CeZrO 2 presented high stability and CO and H 2 formation. ► These samples presented a homogeneous phase of CeZrO 2 which led to higher reducibility. ► High oxygen mobility in CeZrO 2 promoted the mechanism of carbon removal. In this study, we evaluated...
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Published in: | Catalysis today Vol. 180; no. 1; pp. 111 - 116 |
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Main Authors: | , , , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Elsevier B.V
17-01-2012
|
Subjects: | |
Online Access: | Get full text |
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Summary: | [Display omitted]
► Samples with 10 or 20
wt.% CeZrO
2 presented high stability and CO and H
2 formation. ► These samples presented a homogeneous phase of CeZrO
2 which led to higher reducibility. ► High oxygen mobility in CeZrO
2 promoted the mechanism of carbon removal.
In this study, we evaluated the effect of ceria–zirconia content on the performance of Pt/
x%CeZrO
2/Al
2O
3 (
x
=
0–40
wt.%) during partial oxidation of methane. X-ray diffraction results indicated that, for samples containing 10 and 20
wt.% of CeZrO
2, there was the formation of a homogeneous solid solution between ceria and zirconia. On the other hand, for Pt/30%CeZrO
2/Al
2O
3, 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%CeZrO
2/Al
2O
3. Catalytic tests showed that Pt/Al
2O
3 exhibited a significant deactivation, while Pt/10%CeZrO
2/Al
2O
3 and Pt/20%CeZrO
2/Al
2O
3 practically did not loose their activity after 24
h. A deactivation was detected for Pt/30%CeZrO
2/Al
2O
3 and Pt/40%CeZrO
2/Al
2O
3. The higher stability of the Pt/10%CeZrO
2/Al
2O
3 and Pt/20%CeZrO
2/Al
2O
3 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. |
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ISSN: | 0920-5861 1873-4308 |
DOI: | 10.1016/j.cattod.2011.07.035 |