THE EFFECT OF NB2O5 AND ZRO2 ADDITIONS ON THE BEHAVIOR OF LI/MGO AND LI/NA/MGO CATALYSTS FOR THE OXIDATIVE COUPLING OF METHANE

被引:20
作者
MCNAMARA, DJ
KORF, SJ
SESHAN, K
VANOMMEN, JG
ROSS, JRH
机构
[1] Faculty of Chemical Technology, University of Twente, Enschede, 7500 AE
关键词
OXIDATIVE COUPLING; METHANE; LI/MGO; LI/NA/MGO; METAL OXIDE ADDITIVES;
D O I
10.1002/cjce.5450690410
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Incorporation of Nb2O5 or ZrO2 into both Li/MgO and Li/Na/MgO systems produced ternary and quanternary catalysts, respectively, capable of attaining optimal C2 yields and selectivities at lower temperatures relative to the unpromoted materials. The degree of enhancement effected by these metal oxide additives was compared to that produced by Li/MgO and Li/Na/MgO catalysts promoted with SnO2 or Co3O4. At reaction temperatures < 700-degrees-C, the Li/Co/MgO ternary system showed marked differences in behaviour compared to the other ternary catalysts tested. This was particularly evident in the variation in C2 selectivity with time on stream during ageing studies of (i) untreated materials, (ii) materials pretreated in CO2, and (iii) materials dosed periodically with CHCl3.
引用
收藏
页码:883 / 890
页数:8
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