High durability of asymmetrically modified nickel catalysts prepared by in situ modification
High durability of asymmetrically modified nickel catalysts prepared by in situ modification
复制标题
原位改性制备的不对称改性镍催化剂的高耐久性
DOI：
10.1016/s1381-1169(02)00130-9
复制
发表时间：
2002
影响因子：
--
通讯作者：
O. Takayasu
中科院分区：
文献类型：
--
作者：
T. Osawa;Saori Sakai;Kazutomo Deguchi;T. Harada;O. Takayasu
首次运行时，还原镍催化剂的原位改性在乙酰乙酸甲酯的对映异构氢化中表现出高重复使用的耐久性和高光学产率。与雷尼镍相比，氧化镍还原镍和细镍粉是最好的材料。为了获得高光学产率和高耐久性，原位修饰和适合对映异构氢化的镍表面是必要的。常规预改性Ni重复使用耐久性低的原因之一是加氢反应过程中酒石酸从催化剂表面解吸。
The in situ modification of a reduced Ni catalyst at the first run showed a high durability for the repeated use with high optical yields in the enantio-differentiating hydrogenation of methyl acetoacetate. Reduced Ni from Ni oxide and fine Ni powder were the best materials in comparison with Raney Ni. For attaining high optical yields and high durability, in situ modification and a Ni surface suitable for the enantio-differentiating hydrogenation are necessary. One of the reasons for the low durability of the conventional pre-modified Ni with repeated use would be the desorption of tartaric acid from the catalyst surface during the hydrogenation reaction.