抄録
It was found that highly active alkaline co-precipitated copper binary or ternary catalysts were obtained only when acidic metal containing solutions were poured into excessive alkaline solutions. Through the above procedure, catalysts of different Cu : Cr mole ratio were prepared and their activities were compared, which made it possible to decrease Cr against Cu. Co-precipitation of Cr in minor amount (i.e. Cu : Cr=9 : 1 or less), as compared with the Adkins catalyst, quite improved the catalytic activity as well as heat treatment stability, and proved almost the same hydrogenation results obtainable as with the KW type catalyst. Also, a marked increase in catalytic activity was caused by adding such metals as Zn, Al, Co, whereas Cu alone proved to be almost inactive. These observations disagreed with the result reported heretofore (C. A., 352 b ; 353 a, 1950), and support the theory of sintering prevention effect by the additives. Investigations were made to decrease Ni in the Ni-Cu binary catalyst so as to make Cu predominant over Ni to avoid the inherent catalytic effect of the latter. Though the definite ratio was not determined, less than 1 mole of Ni against 9 mole of Cu was presumed to realize the contemplation. Solid fat index of hydrogenated soyabean oil and cotton seed oil indicated that the Ni-Cu catalyst produced hydrogenated products having less solid fat index than the KW type at a same iodine number down to about 70. It was found that pH of co-precipitating atomosphere would cause serious effects on catalytic activities, and for Cu : Ni/9 : 1 combination pH of over 9, for Cu : Cr/9 : 1 combination, pH of over 8 were proved to be suitable to obtain active catalysts. Five kinds hydrogenated finback whale oil having almost same Iodine Number (68-69) were prepared with Adkins, Cu-Cr (9 : 1), Cu-Al (3 : 2), Cu-Ni (9 : 1) and the KW type catalysts. The analytical data showed no significant difference of the three catalysts excepting the Cu-Ni and Adkins, wherein the former made slightly harder products, the latter produced considerable amount of solid and iso-oleic acids.
