The effect of Nb 2 O 5  and ZrO 2  additions on the behaviour of Li/MgO and Li/Na/MgO catalysts for the oxidative coupling of methane | Zendy

Mcnamara D. J. | Zendy; Korf S. J. | Zendy; Seshan K. | Zendy; Van Ommen J. G. | Zendy; Ross J. R. H. | Zendy

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The effect of Nb 2 O 5 and ZrO 2 additions on the behaviour of Li/MgO and Li/Na/MgO catalysts for the oxidative coupling of methane

Author(s) -

Mcnamara D. J.,

Korf S. J.,

Seshan K.,

Van Ommen J. G.,

Ross J. R. H.

Publication year - 1991

Publication title -

the canadian journal of chemical engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.404

H-Index - 67

eISSN - 1939-019X

pISSN - 0008-4034

DOI - 10.1002/cjce.5450690410

Subject(s) - ternary operation , catalysis , selectivity , oxidative coupling of methane , inorganic chemistry , oxide , metal , transition metal , ternary compound , materials science , chemistry , ternary numeral system , metallurgy , organic chemistry , computer science , programming language

Incorporation of Nb 2 O 5 or ZrO 2 into both Li/MgO and Li/Na/MgO systems produced ternary and quaternary catalysts, respectively, capable of attaining optimal C 2 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 SnO 2 or Co 3 O 4 . At reaction temperatures < 700°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 C 2 selectivity with time on stream during ageing studies of (i) untreated materials, (ii) materials pretreated in CO 2 , and (iii) materials dosed periodically with CHCI 3 .

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