Oxidative coupling of methane on Ce/Na/CaO catalysts

被引：9

作者：

Pacheco, JGA ^{[1
]}

Eon, JG ^{[1
]}

Schmal, M ^{[1
]}

机构：

[1] COPPE, NUCAT, Program Engn Quim, BR-21945980 Rio De Janeiro, Brazil

来源：

CATALYSIS LETTERS | 2000年 / 68卷 / 3-4期

关键词：

methane oxidative coupling; Ce/Na/CaO; methane isoconversion;

D O I：

10.1023/A:1019064310606

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：

Oxidative coupling of methane was investigated on Na/CaO and Ce/Na/CaO catalysts with different sodium and cerium contents. The reaction was carried out in a micro fixed-bed flow reactor operating at atmospheric pressure, at 700 and 750 degrees C and molar ratio feed of CH4 : O-2 : N-2 = 50 : 10 : 40. Catalysts were compared at isoconversion and were characterized by BET, XRD and XPS. The addition of cerium to Na/CaO catalyst increased the specific activity by a factor of eight. These catalytic and characterization results were related to the presence not only of Na+O- active sites, formed by the introduction of Na+ in the CaO lattice, but also to peroxide active sites. A mechanism is proposed to explain the role of cerium in increasing the rate of the regeneration step of the O-s(-) and Na2O2 sites.

引用

页码：197 / 202

页数：6

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