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分别在有无超声条件下,采用分步浸渍法制备了负载型Co-Fe/硅藻土催化剂,以肉桂醛选择加氢为肉桂醇为探针反应,在固定床微分反应器上考察了催化剂的活性.采用热分析、红外、XRD及正电子寿命谱等技术分析了催化剂的催化性能及超声波对活性的影响.结果表明,经超声处理的催化剂对肉桂醛加氢为肉桂醇转化率、选择性和收率明显提高.超声处理没有改变催化剂载体的结构,但使主、助催化剂更好地分散在载体上,使催化剂表面的两类缺陷尺寸变小,同时增加第二类缺陷数量,有更好的催化活性.
Respectively, in the presence or absence of ultrasound conditions, the use of step-by-step impregnation prepared Co-Fe / diatomite catalyst cinnamic aldehyde hydrogenation for cinnamyl alcohol as a probe reaction was investigated on a fixed bed differential reactor catalyst The catalytic activity of the catalyst and the effect of the ultrasonic wave on the activity were analyzed by means of the methods of thermal analysis, infrared, XRD and positron lifetime spectroscopy.The results showed that the sonicated cinnamaldehyde was cinnamyl alcohol conversion rate, And the yield was significantly increased.Ultrasonic treatment did not change the structure of the catalyst carrier, but the main and cocatalyst better dispersed in the carrier, the catalyst surface of the two types of defects size becomes smaller, while increasing the number of the second type of defect, there are Better catalytic activity.