Abstract:

A series of TiO₂-SiO₂ supported cobalt catalysts were prepared by using the incipient wetness impregnation method, and their activity and selectivity were evaluated for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol.The effects of Co loading, calcination temperature, reduction temperature and rare earth promoters on the hydrogenation performance of the catalysts were tested.The results showed that the catalytic performance of cobalt catalyst depended on the crystal size of Co on the catalyst surface.The catalyst with bigger Co crystals exhibited higher hydrogenation activity and selectivity of cinnamyl alcohol.The optimal cobalt loading, calcination temperature and reduction temperature of the catalyst for cinnamaldehyde hydrogenation were found to be 15%, 823 K and 823 K, respectively.The addition of rare earth La or Ce enhanced the dispersion of Co on the catalyst surface, and increased the catalytic activity.

Key words:

肉桂醛, 肉桂醇, 钴催化剂, 选择性加氢

摘要： 采用等体积浸渍法制备了系列Co/TiO₂-SiO₂催化剂，用于肉桂醛选择性加氢制备肉桂醇反应体系。系统考察了钴含量、焙烧温度、还原温度、稀土助剂等参数变化对钴催化剂选择性加氢性能的影响。结果表明，钴催化剂的活性和选择性与其表面钴的晶粒度有一定关系，较大尺寸的钴物种对肉桂醛加氢有利。当Co含量为15%、焙烧温度和还原温度均为823 K时，催化剂表现出良好的加氢性能。稀土助剂La和Ce的引入能改善Co /TiO₂-SiO₂催化剂表面活性组分钴的分散度，提高了钴催化剂的加氢性能。

关键词:

肉桂醛, 肉桂醇, 钴催化剂, 选择性加氢