Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 57, Issue 11, Pages 3833-3843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.7b04174
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- Ministry of New and Renewable Energy (MNRE), Government of India
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Alumina supported cobalt catalysts were synthesized for Fischer-Tropsch (FT) reaction using combustion synthesis (CS) method via the redox reaction of hexamethylenetetramine and cobalt nitrate with equivalence ratios (phi) of 1, 1.2, and 1.5. Higher equivalence ratios (phi > 1.0) were selected to increase the synthesis temperature and thereby decrease the formation of cobalt aluminates. Chemisorption and XPS studies of CS(phi = 1.2) and CS(phi = 1.5) catalysts showed high degree of reduction, high metal dispersion, and decreased formation of cobalt aluminates compared to CS(phi = 1) catalysts. Higher FT activity was observed for catalysts synthesized with equivalence ratios of 1.2 and 1.5 compared to the catalysts synthesized with phi = 1. Simultaneously, the hydrocarbon product spectrum shifted from predominantly waxes (C24+) for CS(phi = 1) catalysts to mixed fractions of liquid fuel (C-6-C-24) and waxes for CS(phi = 1.2) and CS(phi = 1.5) catalysts. This work investigates the impact of CS stoichiometry on catalyst properties, in particular the metal support interaction, and its outcome on FT activity and selectivity.
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