A survey of commercial hydrogenation catalysts demonstrated the higher selectivity (SL= 2.4‐2.7) of certain platinum, palladium and rhodium catalysts for hydrogenating linolenic components in soybean oil. Nickel catalysts generally showed selectivities below SL=2.0 although skeletal nickel achieved higher values.Trans‐isomers were in the range 7.8‐15.4% for the above noble metal catalysts. Nickel catalysts provide a lesser degree of isomerization, 5.2‐7.4% oftrans‐isomers for the most selective catalysts.
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Riesz et al. (1964) studied this question.