Effect of the support on the mechanism of partial oxidation of methane on platinum catalysts

被引：37
作者：
Passos, Fabio B.
Oliveira, Elaine R.
Mattos, Lisiane V.
Noronha, Fabio B.
机构：
[1] Univ Fed Fluminense, BR-24210240 Niteroi, RJ, Brazil
[2] Inst Nacl Technol, BR-20081312 Rio De Janeiro, Brazil
来源：
CATALYSIS LETTERS | 2006年 / 110卷 / 1-2期
关键词：
partial Oxidation; natural Gas; methane; Pt/CeO2; Pt/Y(2)O3;
D O I：
10.1007/s10562-006-0105-z
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The partial oxidation of methane was studio on Pt/Al2O3, Pt/ZrO2, Pt/CeO2 and Pt/Y2O3 catalysts. For Pt/Al2O3, Pt/ZrO2 and Pt/CeO2, temperature programmed surface reaction (TPSR) studies showed partial oxidation of methane comprehends two steps: combustion of methane followed by CO2 and steam reforming of unreacted methane, while for Pt/Y2O3 a direct mechanism was observed. Oxygen Storage Capacity (OSC) evaluated the reducibility and oxygen transfer capacity of the catalysts. Pt/CeO2 catalyst showed the highest stability on partial oxidation. The results were explained by the higher reducibility and oxygen storage/release capacity which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability of the catalyst. For Pt/Al2O3 and Pt/ZrO2 catalysts the increase of carbon deposits around or near the metal particle inhibits the CO2 dissociation on CO2 reforming of methane. Pt/Y2O3 was active and stable for partial oxidation of methane and its behaviour was explained by a change in the reaction mechanism.
引用
收藏
页码：161 / 167
页数：7
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