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Steady‐state methanation kinetics over a Ni/Al 2 O 3 catalyst
Author(s) -
Yadav Rajiv,
Rinker R. G.
Publication year - 1993
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.5450710206
Subject(s) - methanation , carbon monoxide , catalysis , hydrogen , dissociation (chemistry) , adsorption , kinetics , chemistry , chemical kinetics , materials science , thermodynamics , analytical chemistry (journal) , physics , organic chemistry , quantum mechanics
Extensive kinetic data for the methanation reaction over a Ni/Al 2 O 3 catalyst were obtained in a specially designed gradientless reactor operating at steady state. The reactor pressure was 101.3 kPa, and three temperatures were used, namely, 503, 513 and 523 K. The following three‐parameter phenomenological model based on a proposed Langmuir‐Hinshelwood mechanism adequately describes the data: r = L 2 K 3 K 4 0.5 k 5 P 0.5 H 2 P co/ [1 + K 3 ( k 5 / k 6 ) P co + K 4 0.5 P 0.5 H 2 ] 2 With dissociative adsorption of hydrogen and hydrogen‐assisted dissociation of adsorbed carbon monoxide, the postulated mari is the CH surface group, and the rds is the hydrogenation of the surface CH group.