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Kinetics of CO hydrogenation over coprecipitated cobalt–alumina
Author(s) -
Akın A. Nilgün,
Önsan Z. İlsen
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199711)70:3<304::aid-jctb766>3.0.co;2-d
Subject(s) - kinetics , activation energy , cobalt , adsorption , chemistry , selectivity , kinetic energy , atmospheric temperature range , carbide , hydrogen , hydrocarbon , catalysis , microreactor , atmospheric pressure , chemical kinetics , analytical chemistry (journal) , materials science , inorganic chemistry , thermodynamics , chromatography , organic chemistry , physics , quantum mechanics , oceanography , geology
The kinetics of CO hydrogenation over coprecipitated 36 wt% Co/Al 2 O 3 was studied in a fixed‐bed microreactor at atmospheric pressure. Intrinsic kinetic data were obtained in the initial rate region using four different CO concentrations and two different H 2 /CO ratios over the 473–523 K temperature range. The surface carbide mechanism with dissociative adsorption of hydrogen as the rate controlling step gives the most plausible kinetic model among the eight different models tested. C 1 –C 4 production rates are found to be strongly influenced by temperature, and optimum C 1 –C 4 hydrocarbon selectivity is obtained at 508 K. The activation energy for CO consumption and CH 4 formation are calculated as 74±2 kJ mol −1 and 84±2 kJ mol −1 respectively. ©1997 SCI