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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Bibliographic Details
Published in:Catalysis today Vol. 180; no. 1; pp. 111 - 116
Main Authors: Silva, Fabiano A., Resende, Karen A., da Silva, Adriana M., de Souza, Kátia R., Mattos, Lisiane V., Montes, Mario, Souza-Aguiar, Eduardo F., Noronha, Fabio B., Hori, Carla E.
Format: Journal Article
Language:English
Published: Elsevier B.V 17-01-2012
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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.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2011.07.035