首页 | 本学科首页   官方微博 | 高级检索  
     


Catalytic hydrogenation of linoleic acid on nickel,copper, and palladium
Authors:Yoshie Kitayama  Masahiro Muraoka  Megumi Takahashi  Tatsuya Kodama  Hirofumi Itoh  Eriko Takahashi  Mutsuo Okamura
Affiliation:(1) Nikki Chemical Co. Ltd. Niitsu Plant Office, 956 Niitsu City, Japan;(2) Department of Chemistry, Faculty of Science, Niigata University, 950-21 Ikarashi Niigata, Japan;(3) Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, Ikarashi, 950-21 Niigata, Japan
Abstract:The catalytic activity and selectivity for hydrogenation of linoleic acid were studied on Ni, Cu, and Pd catalysts. A detailed analysis of the reaction product was performed by a gas-liquid chromatograph, equipped with a capillary column, and Fourier transform-infrared spectroscopy. Geometrical and positional isomerization of linoleic acid occurred during hydrogenation, and many kinds of linoleic acid isomers (trans-9,trans-12; trans-8,cis-12 orcis-9,trans-13; cis-9,trans-12; trans-9,cis-12 andcis-9,cis-12 18∶2) were contained in the reaction products. The monoenoic acids in the partial hydrogenation products contained eight kinds of isomers and showed different isomer distributions on Ni, Cu, and Pd catalysts, respectively. The positional isomers of monoenoic acid were produced by double-bond migration during hydrogenation. On Ni and Pd catalysts, the yield ofcis-12 andtrans-12 monoenoic acids was larger than that ofcis-9 andtrans-9 monoenoic acids. On the contrary, the yield ofcis-9 andtrans-9 monoenoic acids was larger than that ofcis-12 andtrans-12 monoenoic acids on Cu catalyst. From these results, it is concluded that the double bond closer to the methyl group (Δ12) and that to the carboxyl group (Δ9) show different reactivity for hydrogenation on Ni, Cu, and Pd catalysts. Monoenoic acid formation was more selective on Cu catalyst than on Ni and Pd catalysts.
Keywords:Catalytic hydrogenation  Cu  geometrical and positional isomers  linoleic acid  Ni  Pd  reaction mechanism
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号