CATALYTIC OXIDATIVE COUPLING OF METHANE OVER SODIUM-PROMOTED Mn/SiO2 AND Mn/MgO

被引：75

作者：

Sofranko, J. A. ^{[1
]}

Leonard, J. J. ^{[1
]}

Jones, C. A. ^{[1
]}

Gaffney, A. M. ^{[1
]}

Withers, H. P. ^{[1
]}

机构：

[1] Arco Chem Co, Newtown Sq, PA 19073 USA

来源：

CATALYSIS TODAY | 1988年 / 3卷 / 2-3期

关键词：

D O I：

10.1016/0920-5861(88)87003-2

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Oxidative coupling of methane over sodium-promoted manganese-silica and manganese-magnesia was carried out catalytically with a methane-air cofeed. A catalyst of 12.5% sodium permanganate on magnesia gave a 15.7% yield of ethane, ethylene and higher hydrocarbons at 925 degrees C, 9800 GHSV and 50% air in methane. Methane conversion and selectivity to C-2(+) hydrocarbons was 22-25% and 85-70%, respectively. A Mars-van Krevelen type mechanism is proposed in which methyl radicals are formed at surface metal oxide sites. The methyl radicals subsequently dimerize orreact with other hydrocarbons in the gas phase.

引用

页码：127 / 135

页数：9

共 12 条

[1] SURFACE REACTIVITY OF MAGNESIUM OXIDE DOPED WITH MANGANESE - AN ESR AND CHEMISORPTION STUDY [J].