MECHANISM OF THE OXIDATIVE COUPLING OF METHANE USING CO2 AS AN OXIDANT OVER PBO-MGO

被引：78

作者：

NISHIYAMA, T ^{[1
]}

AIKA, K ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,4259 NAGATSUTA,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

JOURNAL OF CATALYSIS | 1990年 / 122卷 / 02期

关键词：

D O I：

10.1016/0021-9517(90)90288-U

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：

CO2 was suggested to be utilized as an oxidant for the oxidative coupling of methane over PbOMgO and alkaline earth metal-doped CaO catalysts under PCH4 = 8.3 kPa, PCO = 8.3 kPa, and PO = 0.08 kPa, and at 1073 K. The mechanism of this reaction (2CH4 + C02 = C2H6 + CO + H2O and/or 2CH4 + 2CO2 = C2H4 + 2CO + 2H20) was studied over a 15 mol% PbOMgO catalyst by using isotope techniques and kinetics. 13CO2 and 12CD4 gave exclusively 13CO and 12C2 hydrocarbons, and no 12CO was produced under the low W/F conditions at 1073 K. One of the oxygen atoms of C02 was concluded to be used for the CH4 coupling reaction through the reverse shift reaction of C02. It was also found that C2 hydrocarbons reacted further with oxygen from C02 under conditions of high conversion. © 1990.

引用

页码：346 / 351

页数：6

共 15 条

[1] UTILIZATION OF CO2 IN THE OXIDATIVE COUPLING OF METHANE OVER PBO-MGO AND PBO-CAO [J].