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Heterogeneous hydrogenation of fish oils: Kinetic determination of catalyst poisoning
Author(s) -
Mørk P. C.
Publication year - 1972
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02582527
Subject(s) - catalysis , iodine value , catalyst poisoning , iodine , chemistry , sulfur , organic chemistry , catalyst support
Mackerel oil was hydrogenated with Nysel Ni catalyst at 170 C and atmospheric pressure. The dependence of the differential rates of hydrogenation on iodine value and catalyst concentration indicated that severe poisoning of the catalyst took place. Further experiments with addition of catalyst during the run as well as with prehydrogenation of the oil to various iodine values revealed the existence of three kinetically distinguishable poisoning effects: a rapid initial poisoning, probably due to the presence of sulfur compounds; a strong primary poisoning completed within the first few minutes of the hydrogenation; and a comparatively slow secondary poisoning reaching a state of equilibrium after 25–30 min of hydrogenation. Similar results were obtained with capelin oil as well as with other commercial catalysts. With soybean oil, no such poisoning effects were observed.