Repeated use of the in-situ modified nickel catalyst for the enantio-differentiating hydrogenation of 2-octanone
Repeated use of the in-situ modified nickel catalyst for the enantio-differentiating hydrogenation of 2-octanone
复制标题
原位改性镍催化剂重复使用用于2-辛酮对映异构加氢
DOI：
10.1016/j.apcata.2003.12.027
复制
发表时间：
2004
影响因子：
5.5
通讯作者：
O. Takayasu
中科院分区：
文献类型：
--
作者：
T. Osawa;Kouji Sawada;T. Harada;O. Takayasu
以氧化镍为原料制备的原位改性还原镍催化剂重复用于2-辛酮的对映异构加氢反应。酒石酸（TA）-NaBr原位修饰的还原Ni催化剂在373 K下，每隔一次反应前加入酒石酸和2-乙基己酸钠，连续16次反应，对映体区分能力（eda）保持在60%以上。催化剂表面吸附态的定量分析表明，在第一次运行中吸附的酒石酸和钠离子在重复运行过程中逐渐脱附。结果支持每隔一次运行向反应介质中加入酒石酸和2-乙基己酸钠以保持对映体区分能力的必要性。
Repeated use of the in-situ modified reduced nickel catalyst prepared from nickel oxide was carried out for the enantio-differentiating hydrogenation of 2-octanone. The tartaric acid (TA)–NaBr in-situ modified reduced Ni retained over 60% of the enantio-differentiating ability (eda) of the catalyst in the hydrogenation at 373K for repeated 16 runs by the addition of tartaric acid and sodium 2-ethylhexanoate to the reaction media before every other run. The quantitative analyses of the adsorbed species on the catalyst surface revealed that the tartaric acid and sodium ions adsorbed in the 1st run were gradually desorbed during the repeated runs. The result supports the necessity of the addition of tartaric acid and sodium 2-ethylhexanoate to the reaction media every other run for retaining the enantio-differentiating ability.