CATALYTIC CONVERSION OF METHANE TO SYNTHESIS GAS OVER EUROPIUM IRIDATE, EU2IR2O7 - AN INSITU STUDY BY X-RAY-DIFFRACTION AND MASS-SPECTROMETRY

被引：84

作者：

JONES, RH ^{[1
]}

ASHCROFT, AT ^{[1
]}

WALLER, D ^{[1
]}

CHEETHAM, AK ^{[1
]}

THOMAS, JM ^{[1
]}

机构：

[1] UNIV OXFORD, CHEM CRYSTALLOG LAB, OXFORD OX1 3PD, ENGLAND

来源：

CATALYSIS LETTERS | 1991年 / 8卷 / 2-4期

关键词：

METHANE OXIDATION; SYNTHESIS GAS; EUROPIUM IRIDATE; PYROCHLORE; IRIDIUM; INSITU;

D O I：

10.1007/BF00764113

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 selective partial oxidation of methane over the europium iridium pyrochlore, Eu2Ir2O7, has been studied in situ by using powder X-ray diffraction and mass spectrometry. At a temperature of 873 K and 1 atmosphere pressure, with a CH4:O2 ratio of 2:1 under argon dilution, high yields of synthesis gas are obtained. The pyrochlore structure of the iridate is modified during the initiation of the catalyst, giving an active solid that is shown to comprise particle of iridium metal, approximately 30 angstrom in diameter, supported on europium oxide, Eu2O3. The modification of the pyrochlore structure was monitored by X-ray diffraction, and the product gases were continuously analysed by mass spectrometry.

引用

页码：169 / 174

页数：6

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