中文摘要：

乙醇的液体阶段 hydrogenolysis 喂奶到 1,2-propanediol 在支持二个不同方法准备的钴催化剂的硅石上被执行：降水胶化(PG ) 技术和免职降水(DP ) 过程。钴种类(Co3O4/cobalt phyllosilicate ) 在相应锻烧的 PG 和 DP 催化剂的现在作为准备方法，和 CoOHCo olation 和 SiOCo oxolation 的后果不同分子的机制被采用阐明化学现象在不同准备过程期间。另外，质地(赌注) ，减小行为(TPR 并且在原处 XRD ) ，钴种类(XPS ) 的表面分散和状态，和催化性能在样品之间极大地不同。因为小粒子尺寸，钴种类的高分散和灵巧的 reducibility，降水胶化方法准备的 Co/SiO2 催化剂比免职降水方法准备的催化剂介绍了一项高得多的活动。金属性的钴被假定根据在反应以后在不同温度和结构变化减少的两件钴样品的催化结果是为 hydrogenolysis 反应的催化地活跃的地点。

英文摘要：

Liquid phase hydrogenolysis of ethyl lactate to 1,2-propanediol was performed over silica supporting cobalt catalysts prepared by two different methods： precipitation-gel （PG） technique and deposition-precipitation （DP） procedure. The cobalt species （Co3O4/cobalt phyllosilicate） present in the corresponding calcined PG and DP catalysts were different as a consequence of the preparation methods, and Co--OH---Co olation and Si--O--Co oxolation molecular mechanisms were employed to elucidate the chemical phenomena during the different preparation procedures. In addition, the texture （BET）, reduction behavior （TPR and in-situ XRD）, surface dispersion and state of cobalt species （XPS）, and catalytic performance differ greatly between the samples. Because of small particle size, high dispersion of cobalt species and facile reducibility, the Co/SiO2 catalyst prepared by precipitation-gel method presented a much higher activity than the catalyst prepared by deposition-precipitation method. Metallic cobalt is assumed to be the catalytically active site for the hydrogenolysis reaction according to the catalytic results of both cobalt samples reduced at different temperatures and the structure changes after reaction.