POISONING OF NICKEL-BASED CATALYSTS IN FAT HYDROGENATION

The influence of various poisoning compounds on the hydrogenation of f at is reviewed. Sulfur-containing compounds, present in both vegetable and marine oils, create serious catalyst deactivation problems. In th is paper, the poisoning efffect of sulfur and its role on the reactant adsorption in different hydrogenation reactions are discussed. Severa l factors affecting the sulfur resistance of the catalyst metal are su mmarized. Other inhibitors influencing the fat hydrogenation, such as phosphorus compounds, free fatty acids, sodium soaps, chlorophyll, hal ogen compounds and products of lipid oxidation, are also considered.